Kotlin Data Class: How generate an MongoDB ObjectId for an embedded document
I'm building an API with Spring Boot and Kotlin. I am trying to generate a structure the following way in MongoDB.
I understand that in MongoDb the concept of relationships between entities does not exist, so I will use the strategy of embedded documents. That is, to embed the Reunión in the Proyecto, and the Participante in the Reunión.
I have a main class called Proyecto
and NewProyecto
, that contains as property a list of reuniones of type NewReunion
. I use two different classes to create and return data.
Proyecto.kt
@Document(collection = "proyectos")
@TypeAlias("proyecto")
data class Proyecto (
@Id
val id: String,
val nombre: String,
val area: String,
val fecha:String,
val reuniones: List<Reunion>?
){}
@Document(collection = "proyectos")
@TypeAlias("newproyecto")
data class NewProyecto (
@Id
val id: String?,//Es posiblemente nulo porqué se crea automáticamente
var nombre: String,
var area: String,
var fecha:String,
var reuniones: List<NewReunion>?
){}
Now, to create 'reuniones' I have two classes, Reunion
and NewReunion
. The class that corresponds to create a MongoDB embedded document is NewReunion
.
NewReunion.kt
@Document
data class Reunion(
val objetivo: String,
val fecha: String,
val participantes: List<Participante>?
) {}
@Document
data class NewReunion(
var id: String? = ObjectId().toHexString(),
var fecha: String,
var participantes: List<NewParticipante>?
) {}
This is where I have the problem. I want to generate an ObjectId for this NewReunion
class, so that each object embedded in it has an id
. The problem is that ObjectId ().ToHexString()
is not generating any value at the time that the object of type NewReunion
is built, but the other data that are objetivo
and fecha
are filled with the data that comes from the request POST.
How I send the information.
The information I send via POST
. This request is handled by a Controller named ProyectoController.kt
ProyectoController.kt
@PostMapping("/")
fun createProyecto(@RequestBody newProyecto: NewProyecto): NewProyecto = proyectoService.createProyecto(newProyecto)
ProyectoRepository.kt
interface ProyectoRepository : MongoRepository<Proyecto, String> {
fun findById(id: ObjectId): Proyecto
override fun findAll(): List<Proyecto>
fun insert(proyecto: NewProyecto): NewProyecto
fun save(proyect: Proyecto): Proyecto
fun deleteById(id: ObjectId)
}
ProyectoService.kt
@Service("proyectoService")
class ProyectoServiceImpl : ProyectoService {
@Autowired
lateinit var proyectoRepository: ProyectoRepository
//Obtener un proyecto
override fun findById(id: ObjectId): Proyecto = proyectoRepository.findById(id)
//Obtener todos los proyectos
override fun findAll(): List<Proyecto> = proyectoRepository.findAll()
//Crear un proyecto
override fun createProyecto(newProyecto: NewProyecto): NewProyecto = proyectoRepository.insert(newProyecto)
//Actualizar un proyecto
override fun updateProyecto(proyecto: Proyecto):Proyecto = proyectoRepository.save(proyecto)
//Eliminar un proyecto
override fun deleteProyecto(id:ObjectId) = proyectoRepository.deleteById(id)
}
POST using Postman:
To send the information I am using Postman, and I send the request in the following way.
At the time of creating the new Proyecto
, I return it to see the result which returns a result with id=null
, but all other fields do assign the corresponding value:
Now, I tried initializing all the constructor parameters of the NewReunion class to see what happened.
data class NewReunion(
@Id
var id: String? = ObjectId().toHexString(),
var objetivo: String = "",
var fecha: String = ""
) {}
the value for the id
is generated correctly together with the other values. It is just this behavior that I do not understand why I need to initialize constructor parameters of the NewReunion
class.
Result of POST with the parameters initialized.
build.gradle
buildscript {
ext.kotlin_version = '1.2.71'
ext {
kotlinVersion = '1.2.71'
springBootVersion = '2.0.6.RELEASE'
}
repositories {
mavenCentral()
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:${kotlinVersion}")
classpath("org.jetbrains.kotlin:kotlin-allopen:${kotlinVersion}")
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
}
}
apply plugin: 'kotlin'
apply plugin: 'kotlin-spring'
apply plugin: 'eclipse-wtp'
apply plugin: 'org.springframework.boot'
apply plugin: 'io.spring.dependency-management'
apply plugin: 'war'
group = 'com.gibranlara'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8
compileKotlin {
kotlinOptions {
freeCompilerArgs = ["-Xjsr305=strict"]
jvmTarget = "1.8"
}
}
compileTestKotlin {
kotlinOptions {
freeCompilerArgs = ["-Xjsr305=strict"]
jvmTarget = "1.8"
}
}
repositories {
mavenCentral()
}
configurations {
providedRuntime
}
dependencies {
compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version" // Required for Kotlin integration
compile "org.jetbrains.kotlin:kotlin-reflect:$kotlin_version"
compile "org.springframework.boot:spring-boot-starter-data-mongodb"
compile 'org.springframework.boot:spring-boot-starter-web'
}
mongodb spring-mvc spring-boot kotlin
|
show 12 more comments
I'm building an API with Spring Boot and Kotlin. I am trying to generate a structure the following way in MongoDB.
I understand that in MongoDb the concept of relationships between entities does not exist, so I will use the strategy of embedded documents. That is, to embed the Reunión in the Proyecto, and the Participante in the Reunión.
I have a main class called Proyecto
and NewProyecto
, that contains as property a list of reuniones of type NewReunion
. I use two different classes to create and return data.
Proyecto.kt
@Document(collection = "proyectos")
@TypeAlias("proyecto")
data class Proyecto (
@Id
val id: String,
val nombre: String,
val area: String,
val fecha:String,
val reuniones: List<Reunion>?
){}
@Document(collection = "proyectos")
@TypeAlias("newproyecto")
data class NewProyecto (
@Id
val id: String?,//Es posiblemente nulo porqué se crea automáticamente
var nombre: String,
var area: String,
var fecha:String,
var reuniones: List<NewReunion>?
){}
Now, to create 'reuniones' I have two classes, Reunion
and NewReunion
. The class that corresponds to create a MongoDB embedded document is NewReunion
.
NewReunion.kt
@Document
data class Reunion(
val objetivo: String,
val fecha: String,
val participantes: List<Participante>?
) {}
@Document
data class NewReunion(
var id: String? = ObjectId().toHexString(),
var fecha: String,
var participantes: List<NewParticipante>?
) {}
This is where I have the problem. I want to generate an ObjectId for this NewReunion
class, so that each object embedded in it has an id
. The problem is that ObjectId ().ToHexString()
is not generating any value at the time that the object of type NewReunion
is built, but the other data that are objetivo
and fecha
are filled with the data that comes from the request POST.
How I send the information.
The information I send via POST
. This request is handled by a Controller named ProyectoController.kt
ProyectoController.kt
@PostMapping("/")
fun createProyecto(@RequestBody newProyecto: NewProyecto): NewProyecto = proyectoService.createProyecto(newProyecto)
ProyectoRepository.kt
interface ProyectoRepository : MongoRepository<Proyecto, String> {
fun findById(id: ObjectId): Proyecto
override fun findAll(): List<Proyecto>
fun insert(proyecto: NewProyecto): NewProyecto
fun save(proyect: Proyecto): Proyecto
fun deleteById(id: ObjectId)
}
ProyectoService.kt
@Service("proyectoService")
class ProyectoServiceImpl : ProyectoService {
@Autowired
lateinit var proyectoRepository: ProyectoRepository
//Obtener un proyecto
override fun findById(id: ObjectId): Proyecto = proyectoRepository.findById(id)
//Obtener todos los proyectos
override fun findAll(): List<Proyecto> = proyectoRepository.findAll()
//Crear un proyecto
override fun createProyecto(newProyecto: NewProyecto): NewProyecto = proyectoRepository.insert(newProyecto)
//Actualizar un proyecto
override fun updateProyecto(proyecto: Proyecto):Proyecto = proyectoRepository.save(proyecto)
//Eliminar un proyecto
override fun deleteProyecto(id:ObjectId) = proyectoRepository.deleteById(id)
}
POST using Postman:
To send the information I am using Postman, and I send the request in the following way.
At the time of creating the new Proyecto
, I return it to see the result which returns a result with id=null
, but all other fields do assign the corresponding value:
Now, I tried initializing all the constructor parameters of the NewReunion class to see what happened.
data class NewReunion(
@Id
var id: String? = ObjectId().toHexString(),
var objetivo: String = "",
var fecha: String = ""
) {}
the value for the id
is generated correctly together with the other values. It is just this behavior that I do not understand why I need to initialize constructor parameters of the NewReunion
class.
Result of POST with the parameters initialized.
build.gradle
buildscript {
ext.kotlin_version = '1.2.71'
ext {
kotlinVersion = '1.2.71'
springBootVersion = '2.0.6.RELEASE'
}
repositories {
mavenCentral()
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:${kotlinVersion}")
classpath("org.jetbrains.kotlin:kotlin-allopen:${kotlinVersion}")
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
}
}
apply plugin: 'kotlin'
apply plugin: 'kotlin-spring'
apply plugin: 'eclipse-wtp'
apply plugin: 'org.springframework.boot'
apply plugin: 'io.spring.dependency-management'
apply plugin: 'war'
group = 'com.gibranlara'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8
compileKotlin {
kotlinOptions {
freeCompilerArgs = ["-Xjsr305=strict"]
jvmTarget = "1.8"
}
}
compileTestKotlin {
kotlinOptions {
freeCompilerArgs = ["-Xjsr305=strict"]
jvmTarget = "1.8"
}
}
repositories {
mavenCentral()
}
configurations {
providedRuntime
}
dependencies {
compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version" // Required for Kotlin integration
compile "org.jetbrains.kotlin:kotlin-reflect:$kotlin_version"
compile "org.springframework.boot:spring-boot-starter-data-mongodb"
compile 'org.springframework.boot:spring-boot-starter-web'
}
mongodb spring-mvc spring-boot kotlin
1
where does it get values forobjetivo
andfecha
if they were empty? I think that examples are not complete. Also I think this post lacks information about used libraries
– asm0dey
Nov 10 at 21:50
@asm0deyobjetivo
andfecha
when creating a new instance should not be empty, so I do not have the properties marked with?
. The information comes from a post made with postman.
– Gibrán
Nov 10 at 22:28
@asm0dey I have edited my question to give more context.
– Gibrán
Nov 10 at 22:44
1
@Gibrán, I've put up a demo of what I think you want to achieve, check it out. github.com/andre-artus/kotlin-optional-param-spring-demo If that look like what you want I can explain it further here.
– Andre Artus
Nov 14 at 19:21
1
Cool. You should probably edit your question to reflect that you were having an issue using Kotlin default parameters in Spring Boot. The question as it stands now is probably not very helpful to others, which is probably why someone down-voted it. You can raise an issue on the GitHub repo I posted if you want to discuss this further. Or take it to chat.
– Andre Artus
Nov 14 at 23:54
|
show 12 more comments
I'm building an API with Spring Boot and Kotlin. I am trying to generate a structure the following way in MongoDB.
I understand that in MongoDb the concept of relationships between entities does not exist, so I will use the strategy of embedded documents. That is, to embed the Reunión in the Proyecto, and the Participante in the Reunión.
I have a main class called Proyecto
and NewProyecto
, that contains as property a list of reuniones of type NewReunion
. I use two different classes to create and return data.
Proyecto.kt
@Document(collection = "proyectos")
@TypeAlias("proyecto")
data class Proyecto (
@Id
val id: String,
val nombre: String,
val area: String,
val fecha:String,
val reuniones: List<Reunion>?
){}
@Document(collection = "proyectos")
@TypeAlias("newproyecto")
data class NewProyecto (
@Id
val id: String?,//Es posiblemente nulo porqué se crea automáticamente
var nombre: String,
var area: String,
var fecha:String,
var reuniones: List<NewReunion>?
){}
Now, to create 'reuniones' I have two classes, Reunion
and NewReunion
. The class that corresponds to create a MongoDB embedded document is NewReunion
.
NewReunion.kt
@Document
data class Reunion(
val objetivo: String,
val fecha: String,
val participantes: List<Participante>?
) {}
@Document
data class NewReunion(
var id: String? = ObjectId().toHexString(),
var fecha: String,
var participantes: List<NewParticipante>?
) {}
This is where I have the problem. I want to generate an ObjectId for this NewReunion
class, so that each object embedded in it has an id
. The problem is that ObjectId ().ToHexString()
is not generating any value at the time that the object of type NewReunion
is built, but the other data that are objetivo
and fecha
are filled with the data that comes from the request POST.
How I send the information.
The information I send via POST
. This request is handled by a Controller named ProyectoController.kt
ProyectoController.kt
@PostMapping("/")
fun createProyecto(@RequestBody newProyecto: NewProyecto): NewProyecto = proyectoService.createProyecto(newProyecto)
ProyectoRepository.kt
interface ProyectoRepository : MongoRepository<Proyecto, String> {
fun findById(id: ObjectId): Proyecto
override fun findAll(): List<Proyecto>
fun insert(proyecto: NewProyecto): NewProyecto
fun save(proyect: Proyecto): Proyecto
fun deleteById(id: ObjectId)
}
ProyectoService.kt
@Service("proyectoService")
class ProyectoServiceImpl : ProyectoService {
@Autowired
lateinit var proyectoRepository: ProyectoRepository
//Obtener un proyecto
override fun findById(id: ObjectId): Proyecto = proyectoRepository.findById(id)
//Obtener todos los proyectos
override fun findAll(): List<Proyecto> = proyectoRepository.findAll()
//Crear un proyecto
override fun createProyecto(newProyecto: NewProyecto): NewProyecto = proyectoRepository.insert(newProyecto)
//Actualizar un proyecto
override fun updateProyecto(proyecto: Proyecto):Proyecto = proyectoRepository.save(proyecto)
//Eliminar un proyecto
override fun deleteProyecto(id:ObjectId) = proyectoRepository.deleteById(id)
}
POST using Postman:
To send the information I am using Postman, and I send the request in the following way.
At the time of creating the new Proyecto
, I return it to see the result which returns a result with id=null
, but all other fields do assign the corresponding value:
Now, I tried initializing all the constructor parameters of the NewReunion class to see what happened.
data class NewReunion(
@Id
var id: String? = ObjectId().toHexString(),
var objetivo: String = "",
var fecha: String = ""
) {}
the value for the id
is generated correctly together with the other values. It is just this behavior that I do not understand why I need to initialize constructor parameters of the NewReunion
class.
Result of POST with the parameters initialized.
build.gradle
buildscript {
ext.kotlin_version = '1.2.71'
ext {
kotlinVersion = '1.2.71'
springBootVersion = '2.0.6.RELEASE'
}
repositories {
mavenCentral()
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:${kotlinVersion}")
classpath("org.jetbrains.kotlin:kotlin-allopen:${kotlinVersion}")
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
}
}
apply plugin: 'kotlin'
apply plugin: 'kotlin-spring'
apply plugin: 'eclipse-wtp'
apply plugin: 'org.springframework.boot'
apply plugin: 'io.spring.dependency-management'
apply plugin: 'war'
group = 'com.gibranlara'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8
compileKotlin {
kotlinOptions {
freeCompilerArgs = ["-Xjsr305=strict"]
jvmTarget = "1.8"
}
}
compileTestKotlin {
kotlinOptions {
freeCompilerArgs = ["-Xjsr305=strict"]
jvmTarget = "1.8"
}
}
repositories {
mavenCentral()
}
configurations {
providedRuntime
}
dependencies {
compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version" // Required for Kotlin integration
compile "org.jetbrains.kotlin:kotlin-reflect:$kotlin_version"
compile "org.springframework.boot:spring-boot-starter-data-mongodb"
compile 'org.springframework.boot:spring-boot-starter-web'
}
mongodb spring-mvc spring-boot kotlin
I'm building an API with Spring Boot and Kotlin. I am trying to generate a structure the following way in MongoDB.
I understand that in MongoDb the concept of relationships between entities does not exist, so I will use the strategy of embedded documents. That is, to embed the Reunión in the Proyecto, and the Participante in the Reunión.
I have a main class called Proyecto
and NewProyecto
, that contains as property a list of reuniones of type NewReunion
. I use two different classes to create and return data.
Proyecto.kt
@Document(collection = "proyectos")
@TypeAlias("proyecto")
data class Proyecto (
@Id
val id: String,
val nombre: String,
val area: String,
val fecha:String,
val reuniones: List<Reunion>?
){}
@Document(collection = "proyectos")
@TypeAlias("newproyecto")
data class NewProyecto (
@Id
val id: String?,//Es posiblemente nulo porqué se crea automáticamente
var nombre: String,
var area: String,
var fecha:String,
var reuniones: List<NewReunion>?
){}
Now, to create 'reuniones' I have two classes, Reunion
and NewReunion
. The class that corresponds to create a MongoDB embedded document is NewReunion
.
NewReunion.kt
@Document
data class Reunion(
val objetivo: String,
val fecha: String,
val participantes: List<Participante>?
) {}
@Document
data class NewReunion(
var id: String? = ObjectId().toHexString(),
var fecha: String,
var participantes: List<NewParticipante>?
) {}
This is where I have the problem. I want to generate an ObjectId for this NewReunion
class, so that each object embedded in it has an id
. The problem is that ObjectId ().ToHexString()
is not generating any value at the time that the object of type NewReunion
is built, but the other data that are objetivo
and fecha
are filled with the data that comes from the request POST.
How I send the information.
The information I send via POST
. This request is handled by a Controller named ProyectoController.kt
ProyectoController.kt
@PostMapping("/")
fun createProyecto(@RequestBody newProyecto: NewProyecto): NewProyecto = proyectoService.createProyecto(newProyecto)
ProyectoRepository.kt
interface ProyectoRepository : MongoRepository<Proyecto, String> {
fun findById(id: ObjectId): Proyecto
override fun findAll(): List<Proyecto>
fun insert(proyecto: NewProyecto): NewProyecto
fun save(proyect: Proyecto): Proyecto
fun deleteById(id: ObjectId)
}
ProyectoService.kt
@Service("proyectoService")
class ProyectoServiceImpl : ProyectoService {
@Autowired
lateinit var proyectoRepository: ProyectoRepository
//Obtener un proyecto
override fun findById(id: ObjectId): Proyecto = proyectoRepository.findById(id)
//Obtener todos los proyectos
override fun findAll(): List<Proyecto> = proyectoRepository.findAll()
//Crear un proyecto
override fun createProyecto(newProyecto: NewProyecto): NewProyecto = proyectoRepository.insert(newProyecto)
//Actualizar un proyecto
override fun updateProyecto(proyecto: Proyecto):Proyecto = proyectoRepository.save(proyecto)
//Eliminar un proyecto
override fun deleteProyecto(id:ObjectId) = proyectoRepository.deleteById(id)
}
POST using Postman:
To send the information I am using Postman, and I send the request in the following way.
At the time of creating the new Proyecto
, I return it to see the result which returns a result with id=null
, but all other fields do assign the corresponding value:
Now, I tried initializing all the constructor parameters of the NewReunion class to see what happened.
data class NewReunion(
@Id
var id: String? = ObjectId().toHexString(),
var objetivo: String = "",
var fecha: String = ""
) {}
the value for the id
is generated correctly together with the other values. It is just this behavior that I do not understand why I need to initialize constructor parameters of the NewReunion
class.
Result of POST with the parameters initialized.
build.gradle
buildscript {
ext.kotlin_version = '1.2.71'
ext {
kotlinVersion = '1.2.71'
springBootVersion = '2.0.6.RELEASE'
}
repositories {
mavenCentral()
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:${kotlinVersion}")
classpath("org.jetbrains.kotlin:kotlin-allopen:${kotlinVersion}")
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
}
}
apply plugin: 'kotlin'
apply plugin: 'kotlin-spring'
apply plugin: 'eclipse-wtp'
apply plugin: 'org.springframework.boot'
apply plugin: 'io.spring.dependency-management'
apply plugin: 'war'
group = 'com.gibranlara'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8
compileKotlin {
kotlinOptions {
freeCompilerArgs = ["-Xjsr305=strict"]
jvmTarget = "1.8"
}
}
compileTestKotlin {
kotlinOptions {
freeCompilerArgs = ["-Xjsr305=strict"]
jvmTarget = "1.8"
}
}
repositories {
mavenCentral()
}
configurations {
providedRuntime
}
dependencies {
compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version" // Required for Kotlin integration
compile "org.jetbrains.kotlin:kotlin-reflect:$kotlin_version"
compile "org.springframework.boot:spring-boot-starter-data-mongodb"
compile 'org.springframework.boot:spring-boot-starter-web'
}
mongodb spring-mvc spring-boot kotlin
mongodb spring-mvc spring-boot kotlin
edited Nov 16 at 13:37
asked Nov 10 at 21:12
Gibrán
176
176
1
where does it get values forobjetivo
andfecha
if they were empty? I think that examples are not complete. Also I think this post lacks information about used libraries
– asm0dey
Nov 10 at 21:50
@asm0deyobjetivo
andfecha
when creating a new instance should not be empty, so I do not have the properties marked with?
. The information comes from a post made with postman.
– Gibrán
Nov 10 at 22:28
@asm0dey I have edited my question to give more context.
– Gibrán
Nov 10 at 22:44
1
@Gibrán, I've put up a demo of what I think you want to achieve, check it out. github.com/andre-artus/kotlin-optional-param-spring-demo If that look like what you want I can explain it further here.
– Andre Artus
Nov 14 at 19:21
1
Cool. You should probably edit your question to reflect that you were having an issue using Kotlin default parameters in Spring Boot. The question as it stands now is probably not very helpful to others, which is probably why someone down-voted it. You can raise an issue on the GitHub repo I posted if you want to discuss this further. Or take it to chat.
– Andre Artus
Nov 14 at 23:54
|
show 12 more comments
1
where does it get values forobjetivo
andfecha
if they were empty? I think that examples are not complete. Also I think this post lacks information about used libraries
– asm0dey
Nov 10 at 21:50
@asm0deyobjetivo
andfecha
when creating a new instance should not be empty, so I do not have the properties marked with?
. The information comes from a post made with postman.
– Gibrán
Nov 10 at 22:28
@asm0dey I have edited my question to give more context.
– Gibrán
Nov 10 at 22:44
1
@Gibrán, I've put up a demo of what I think you want to achieve, check it out. github.com/andre-artus/kotlin-optional-param-spring-demo If that look like what you want I can explain it further here.
– Andre Artus
Nov 14 at 19:21
1
Cool. You should probably edit your question to reflect that you were having an issue using Kotlin default parameters in Spring Boot. The question as it stands now is probably not very helpful to others, which is probably why someone down-voted it. You can raise an issue on the GitHub repo I posted if you want to discuss this further. Or take it to chat.
– Andre Artus
Nov 14 at 23:54
1
1
where does it get values for
objetivo
and fecha
if they were empty? I think that examples are not complete. Also I think this post lacks information about used libraries– asm0dey
Nov 10 at 21:50
where does it get values for
objetivo
and fecha
if they were empty? I think that examples are not complete. Also I think this post lacks information about used libraries– asm0dey
Nov 10 at 21:50
@asm0dey
objetivo
and fecha
when creating a new instance should not be empty, so I do not have the properties marked with ?
. The information comes from a post made with postman.– Gibrán
Nov 10 at 22:28
@asm0dey
objetivo
and fecha
when creating a new instance should not be empty, so I do not have the properties marked with ?
. The information comes from a post made with postman.– Gibrán
Nov 10 at 22:28
@asm0dey I have edited my question to give more context.
– Gibrán
Nov 10 at 22:44
@asm0dey I have edited my question to give more context.
– Gibrán
Nov 10 at 22:44
1
1
@Gibrán, I've put up a demo of what I think you want to achieve, check it out. github.com/andre-artus/kotlin-optional-param-spring-demo If that look like what you want I can explain it further here.
– Andre Artus
Nov 14 at 19:21
@Gibrán, I've put up a demo of what I think you want to achieve, check it out. github.com/andre-artus/kotlin-optional-param-spring-demo If that look like what you want I can explain it further here.
– Andre Artus
Nov 14 at 19:21
1
1
Cool. You should probably edit your question to reflect that you were having an issue using Kotlin default parameters in Spring Boot. The question as it stands now is probably not very helpful to others, which is probably why someone down-voted it. You can raise an issue on the GitHub repo I posted if you want to discuss this further. Or take it to chat.
– Andre Artus
Nov 14 at 23:54
Cool. You should probably edit your question to reflect that you were having an issue using Kotlin default parameters in Spring Boot. The question as it stands now is probably not very helpful to others, which is probably why someone down-voted it. You can raise an issue on the GitHub repo I posted if you want to discuss this further. Or take it to chat.
– Andre Artus
Nov 14 at 23:54
|
show 12 more comments
1 Answer
1
active
oldest
votes
The library you are using is probably not written with Kotlin in mind.
Kotlin generates a synthetic constructor that loads default values prior to calling the actual constructor, e.g.
// Java
public NewReunion(String var1, String var2, String var3, int var4, DefaultConstructorMarker var5) {
if ((var4 & 1) != 0) {
var1 = ObjectId().toHexString();
}
this(var1, var2, var3);
}
The library is likely doing one of the following:
- Calling the default constructor, then calling set[Property] matching the annotations/convention.
- Calling the closest match constructor:
NewReunion(@Nullable String id, @NotNull String objetivo, @NotNull String fecha)
withNewReunion(null, "objetivo", "fecha")
If you define your class as such:
data class NewReunion @JvmOverloads constructor(
var id: String? = "",
var objetivo: String,
var fecha: String
)
You will get additional constructors e.g.
// Java
public NewReunion(@NotNull String objetivo, @NotNull String fecha)
If your library is using the first option then you may need to lazy initialize the id
field in a getter (also convert data class to normal class).
An Aside
Most of these kind of problems stem from devs using the same object model for communication and business logic. Whenever I see a nullable id
on an entity it like a clarion call that bugs are afoot.
Any data you get from an outside source(even if it's from a server you control) should be treated as if it was put there by your most baleful enemy, but many developers just suck it in and use it as it comes.
If you don't have something along the lines of
val cleanData = validate(inputData)
before crossing from an input layer to a business layer then you are setting yourself up for future embarrassment.
Input layers are:
- User interface
- Web services
- Anything coming from outside your immediate domain of control
But I'm not using any library. I just initialize a new spring boot application, added the kotlin dependency and that's all. I'm using the NewReunion model only for creation. The id is null because I am not sending the ObjectId from the fron-end, but I want that when a NewReunion object is generated it generates an objectid for that object. To return the information I am using a model called Proyecto, which does not allow for null values.
– Gibrán
Nov 12 at 15:04
If you are using Spring Boot then you are using not one, but many [Java] libraries. See my advice above, under "An Aside". The two models, even if they look [almost] the same, should not be forced into one. You should really have some logic in-between the two that maps from the input model (NewReunion?) to the output model (Proyecto?). That mapping function should be responsible for ensuring all fields are valid, incl.ObjectId. Use the type system to your advantage.
– Andre Artus
Nov 12 at 23:36
Currently I have my model, controllers, repositories and services. I just do not know at what point it is where I should generate the id for the embedded document (NewReunion). If you allow me I can place all my code to give more context, what do you think?
– Gibrán
Nov 13 at 0:10
I have already edited my question with more information.
– Gibrán
Nov 13 at 0:47
1
That's cool, I'll have to look at it later though, as it is bedtime for me.
– Andre Artus
Nov 13 at 2:45
|
show 1 more comment
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The library you are using is probably not written with Kotlin in mind.
Kotlin generates a synthetic constructor that loads default values prior to calling the actual constructor, e.g.
// Java
public NewReunion(String var1, String var2, String var3, int var4, DefaultConstructorMarker var5) {
if ((var4 & 1) != 0) {
var1 = ObjectId().toHexString();
}
this(var1, var2, var3);
}
The library is likely doing one of the following:
- Calling the default constructor, then calling set[Property] matching the annotations/convention.
- Calling the closest match constructor:
NewReunion(@Nullable String id, @NotNull String objetivo, @NotNull String fecha)
withNewReunion(null, "objetivo", "fecha")
If you define your class as such:
data class NewReunion @JvmOverloads constructor(
var id: String? = "",
var objetivo: String,
var fecha: String
)
You will get additional constructors e.g.
// Java
public NewReunion(@NotNull String objetivo, @NotNull String fecha)
If your library is using the first option then you may need to lazy initialize the id
field in a getter (also convert data class to normal class).
An Aside
Most of these kind of problems stem from devs using the same object model for communication and business logic. Whenever I see a nullable id
on an entity it like a clarion call that bugs are afoot.
Any data you get from an outside source(even if it's from a server you control) should be treated as if it was put there by your most baleful enemy, but many developers just suck it in and use it as it comes.
If you don't have something along the lines of
val cleanData = validate(inputData)
before crossing from an input layer to a business layer then you are setting yourself up for future embarrassment.
Input layers are:
- User interface
- Web services
- Anything coming from outside your immediate domain of control
But I'm not using any library. I just initialize a new spring boot application, added the kotlin dependency and that's all. I'm using the NewReunion model only for creation. The id is null because I am not sending the ObjectId from the fron-end, but I want that when a NewReunion object is generated it generates an objectid for that object. To return the information I am using a model called Proyecto, which does not allow for null values.
– Gibrán
Nov 12 at 15:04
If you are using Spring Boot then you are using not one, but many [Java] libraries. See my advice above, under "An Aside". The two models, even if they look [almost] the same, should not be forced into one. You should really have some logic in-between the two that maps from the input model (NewReunion?) to the output model (Proyecto?). That mapping function should be responsible for ensuring all fields are valid, incl.ObjectId. Use the type system to your advantage.
– Andre Artus
Nov 12 at 23:36
Currently I have my model, controllers, repositories and services. I just do not know at what point it is where I should generate the id for the embedded document (NewReunion). If you allow me I can place all my code to give more context, what do you think?
– Gibrán
Nov 13 at 0:10
I have already edited my question with more information.
– Gibrán
Nov 13 at 0:47
1
That's cool, I'll have to look at it later though, as it is bedtime for me.
– Andre Artus
Nov 13 at 2:45
|
show 1 more comment
The library you are using is probably not written with Kotlin in mind.
Kotlin generates a synthetic constructor that loads default values prior to calling the actual constructor, e.g.
// Java
public NewReunion(String var1, String var2, String var3, int var4, DefaultConstructorMarker var5) {
if ((var4 & 1) != 0) {
var1 = ObjectId().toHexString();
}
this(var1, var2, var3);
}
The library is likely doing one of the following:
- Calling the default constructor, then calling set[Property] matching the annotations/convention.
- Calling the closest match constructor:
NewReunion(@Nullable String id, @NotNull String objetivo, @NotNull String fecha)
withNewReunion(null, "objetivo", "fecha")
If you define your class as such:
data class NewReunion @JvmOverloads constructor(
var id: String? = "",
var objetivo: String,
var fecha: String
)
You will get additional constructors e.g.
// Java
public NewReunion(@NotNull String objetivo, @NotNull String fecha)
If your library is using the first option then you may need to lazy initialize the id
field in a getter (also convert data class to normal class).
An Aside
Most of these kind of problems stem from devs using the same object model for communication and business logic. Whenever I see a nullable id
on an entity it like a clarion call that bugs are afoot.
Any data you get from an outside source(even if it's from a server you control) should be treated as if it was put there by your most baleful enemy, but many developers just suck it in and use it as it comes.
If you don't have something along the lines of
val cleanData = validate(inputData)
before crossing from an input layer to a business layer then you are setting yourself up for future embarrassment.
Input layers are:
- User interface
- Web services
- Anything coming from outside your immediate domain of control
But I'm not using any library. I just initialize a new spring boot application, added the kotlin dependency and that's all. I'm using the NewReunion model only for creation. The id is null because I am not sending the ObjectId from the fron-end, but I want that when a NewReunion object is generated it generates an objectid for that object. To return the information I am using a model called Proyecto, which does not allow for null values.
– Gibrán
Nov 12 at 15:04
If you are using Spring Boot then you are using not one, but many [Java] libraries. See my advice above, under "An Aside". The two models, even if they look [almost] the same, should not be forced into one. You should really have some logic in-between the two that maps from the input model (NewReunion?) to the output model (Proyecto?). That mapping function should be responsible for ensuring all fields are valid, incl.ObjectId. Use the type system to your advantage.
– Andre Artus
Nov 12 at 23:36
Currently I have my model, controllers, repositories and services. I just do not know at what point it is where I should generate the id for the embedded document (NewReunion). If you allow me I can place all my code to give more context, what do you think?
– Gibrán
Nov 13 at 0:10
I have already edited my question with more information.
– Gibrán
Nov 13 at 0:47
1
That's cool, I'll have to look at it later though, as it is bedtime for me.
– Andre Artus
Nov 13 at 2:45
|
show 1 more comment
The library you are using is probably not written with Kotlin in mind.
Kotlin generates a synthetic constructor that loads default values prior to calling the actual constructor, e.g.
// Java
public NewReunion(String var1, String var2, String var3, int var4, DefaultConstructorMarker var5) {
if ((var4 & 1) != 0) {
var1 = ObjectId().toHexString();
}
this(var1, var2, var3);
}
The library is likely doing one of the following:
- Calling the default constructor, then calling set[Property] matching the annotations/convention.
- Calling the closest match constructor:
NewReunion(@Nullable String id, @NotNull String objetivo, @NotNull String fecha)
withNewReunion(null, "objetivo", "fecha")
If you define your class as such:
data class NewReunion @JvmOverloads constructor(
var id: String? = "",
var objetivo: String,
var fecha: String
)
You will get additional constructors e.g.
// Java
public NewReunion(@NotNull String objetivo, @NotNull String fecha)
If your library is using the first option then you may need to lazy initialize the id
field in a getter (also convert data class to normal class).
An Aside
Most of these kind of problems stem from devs using the same object model for communication and business logic. Whenever I see a nullable id
on an entity it like a clarion call that bugs are afoot.
Any data you get from an outside source(even if it's from a server you control) should be treated as if it was put there by your most baleful enemy, but many developers just suck it in and use it as it comes.
If you don't have something along the lines of
val cleanData = validate(inputData)
before crossing from an input layer to a business layer then you are setting yourself up for future embarrassment.
Input layers are:
- User interface
- Web services
- Anything coming from outside your immediate domain of control
The library you are using is probably not written with Kotlin in mind.
Kotlin generates a synthetic constructor that loads default values prior to calling the actual constructor, e.g.
// Java
public NewReunion(String var1, String var2, String var3, int var4, DefaultConstructorMarker var5) {
if ((var4 & 1) != 0) {
var1 = ObjectId().toHexString();
}
this(var1, var2, var3);
}
The library is likely doing one of the following:
- Calling the default constructor, then calling set[Property] matching the annotations/convention.
- Calling the closest match constructor:
NewReunion(@Nullable String id, @NotNull String objetivo, @NotNull String fecha)
withNewReunion(null, "objetivo", "fecha")
If you define your class as such:
data class NewReunion @JvmOverloads constructor(
var id: String? = "",
var objetivo: String,
var fecha: String
)
You will get additional constructors e.g.
// Java
public NewReunion(@NotNull String objetivo, @NotNull String fecha)
If your library is using the first option then you may need to lazy initialize the id
field in a getter (also convert data class to normal class).
An Aside
Most of these kind of problems stem from devs using the same object model for communication and business logic. Whenever I see a nullable id
on an entity it like a clarion call that bugs are afoot.
Any data you get from an outside source(even if it's from a server you control) should be treated as if it was put there by your most baleful enemy, but many developers just suck it in and use it as it comes.
If you don't have something along the lines of
val cleanData = validate(inputData)
before crossing from an input layer to a business layer then you are setting yourself up for future embarrassment.
Input layers are:
- User interface
- Web services
- Anything coming from outside your immediate domain of control
answered Nov 11 at 18:42
Andre Artus
1,4891118
1,4891118
But I'm not using any library. I just initialize a new spring boot application, added the kotlin dependency and that's all. I'm using the NewReunion model only for creation. The id is null because I am not sending the ObjectId from the fron-end, but I want that when a NewReunion object is generated it generates an objectid for that object. To return the information I am using a model called Proyecto, which does not allow for null values.
– Gibrán
Nov 12 at 15:04
If you are using Spring Boot then you are using not one, but many [Java] libraries. See my advice above, under "An Aside". The two models, even if they look [almost] the same, should not be forced into one. You should really have some logic in-between the two that maps from the input model (NewReunion?) to the output model (Proyecto?). That mapping function should be responsible for ensuring all fields are valid, incl.ObjectId. Use the type system to your advantage.
– Andre Artus
Nov 12 at 23:36
Currently I have my model, controllers, repositories and services. I just do not know at what point it is where I should generate the id for the embedded document (NewReunion). If you allow me I can place all my code to give more context, what do you think?
– Gibrán
Nov 13 at 0:10
I have already edited my question with more information.
– Gibrán
Nov 13 at 0:47
1
That's cool, I'll have to look at it later though, as it is bedtime for me.
– Andre Artus
Nov 13 at 2:45
|
show 1 more comment
But I'm not using any library. I just initialize a new spring boot application, added the kotlin dependency and that's all. I'm using the NewReunion model only for creation. The id is null because I am not sending the ObjectId from the fron-end, but I want that when a NewReunion object is generated it generates an objectid for that object. To return the information I am using a model called Proyecto, which does not allow for null values.
– Gibrán
Nov 12 at 15:04
If you are using Spring Boot then you are using not one, but many [Java] libraries. See my advice above, under "An Aside". The two models, even if they look [almost] the same, should not be forced into one. You should really have some logic in-between the two that maps from the input model (NewReunion?) to the output model (Proyecto?). That mapping function should be responsible for ensuring all fields are valid, incl.ObjectId. Use the type system to your advantage.
– Andre Artus
Nov 12 at 23:36
Currently I have my model, controllers, repositories and services. I just do not know at what point it is where I should generate the id for the embedded document (NewReunion). If you allow me I can place all my code to give more context, what do you think?
– Gibrán
Nov 13 at 0:10
I have already edited my question with more information.
– Gibrán
Nov 13 at 0:47
1
That's cool, I'll have to look at it later though, as it is bedtime for me.
– Andre Artus
Nov 13 at 2:45
But I'm not using any library. I just initialize a new spring boot application, added the kotlin dependency and that's all. I'm using the NewReunion model only for creation. The id is null because I am not sending the ObjectId from the fron-end, but I want that when a NewReunion object is generated it generates an objectid for that object. To return the information I am using a model called Proyecto, which does not allow for null values.
– Gibrán
Nov 12 at 15:04
But I'm not using any library. I just initialize a new spring boot application, added the kotlin dependency and that's all. I'm using the NewReunion model only for creation. The id is null because I am not sending the ObjectId from the fron-end, but I want that when a NewReunion object is generated it generates an objectid for that object. To return the information I am using a model called Proyecto, which does not allow for null values.
– Gibrán
Nov 12 at 15:04
If you are using Spring Boot then you are using not one, but many [Java] libraries. See my advice above, under "An Aside". The two models, even if they look [almost] the same, should not be forced into one. You should really have some logic in-between the two that maps from the input model (NewReunion?) to the output model (Proyecto?). That mapping function should be responsible for ensuring all fields are valid, incl.ObjectId. Use the type system to your advantage.
– Andre Artus
Nov 12 at 23:36
If you are using Spring Boot then you are using not one, but many [Java] libraries. See my advice above, under "An Aside". The two models, even if they look [almost] the same, should not be forced into one. You should really have some logic in-between the two that maps from the input model (NewReunion?) to the output model (Proyecto?). That mapping function should be responsible for ensuring all fields are valid, incl.ObjectId. Use the type system to your advantage.
– Andre Artus
Nov 12 at 23:36
Currently I have my model, controllers, repositories and services. I just do not know at what point it is where I should generate the id for the embedded document (NewReunion). If you allow me I can place all my code to give more context, what do you think?
– Gibrán
Nov 13 at 0:10
Currently I have my model, controllers, repositories and services. I just do not know at what point it is where I should generate the id for the embedded document (NewReunion). If you allow me I can place all my code to give more context, what do you think?
– Gibrán
Nov 13 at 0:10
I have already edited my question with more information.
– Gibrán
Nov 13 at 0:47
I have already edited my question with more information.
– Gibrán
Nov 13 at 0:47
1
1
That's cool, I'll have to look at it later though, as it is bedtime for me.
– Andre Artus
Nov 13 at 2:45
That's cool, I'll have to look at it later though, as it is bedtime for me.
– Andre Artus
Nov 13 at 2:45
|
show 1 more comment
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1
where does it get values for
objetivo
andfecha
if they were empty? I think that examples are not complete. Also I think this post lacks information about used libraries– asm0dey
Nov 10 at 21:50
@asm0dey
objetivo
andfecha
when creating a new instance should not be empty, so I do not have the properties marked with?
. The information comes from a post made with postman.– Gibrán
Nov 10 at 22:28
@asm0dey I have edited my question to give more context.
– Gibrán
Nov 10 at 22:44
1
@Gibrán, I've put up a demo of what I think you want to achieve, check it out. github.com/andre-artus/kotlin-optional-param-spring-demo If that look like what you want I can explain it further here.
– Andre Artus
Nov 14 at 19:21
1
Cool. You should probably edit your question to reflect that you were having an issue using Kotlin default parameters in Spring Boot. The question as it stands now is probably not very helpful to others, which is probably why someone down-voted it. You can raise an issue on the GitHub repo I posted if you want to discuss this further. Or take it to chat.
– Andre Artus
Nov 14 at 23:54