How do “apps” work from django's point of view?











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First of all, the question is technical, not conceptual.



The docs mention, in various places, that you are supposed to put in INSTALLED_APPS the root module of your app. However, what is that module supposed to contain?



Most of the files created by startapp myapp are just there by convention. For example urls, views, admin files are imported from other modules by fully qualified name, and could really be anywhere, so they are just conventions. The only thing that seems to be "hard-coded" in the django logic is the models.py.



So, from the INSTALLED_APPS point of view, does an app consist solely of its models.py? Or is there something else I'm missing? And does the documentation explicitly state this anywhere?










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    I'm no expert in the Django internals, but does this page have the information you want? docs.djangoproject.com/en/2.1/ref/applications. In particular: It is important to understand that a Django application is just a set of code that interacts with various parts of the framework. There’s no such thing as an Application object. However, there’s a few places where Django needs to interact with installed applications, mainly for configuration and also for introspection. That’s why the application registry maintains metadata in an AppConfig instance for each installed application.
    – Robin Zigmond
    Nov 9 at 15:12










  • @RobinZigmond: thanks. the problem is what exactly configuration and retrospection includes. I can't find it anywhere in the docs. The sentence following, seems to enforce my suspicions that only models matter: There’s no restriction that a project package can’t also be considered an application and have models, etc. (which would require adding it to INSTALLED_APPS).
    – blue_note
    Nov 9 at 15:21















up vote
1
down vote

favorite
1












First of all, the question is technical, not conceptual.



The docs mention, in various places, that you are supposed to put in INSTALLED_APPS the root module of your app. However, what is that module supposed to contain?



Most of the files created by startapp myapp are just there by convention. For example urls, views, admin files are imported from other modules by fully qualified name, and could really be anywhere, so they are just conventions. The only thing that seems to be "hard-coded" in the django logic is the models.py.



So, from the INSTALLED_APPS point of view, does an app consist solely of its models.py? Or is there something else I'm missing? And does the documentation explicitly state this anywhere?










share|improve this question


















  • 1




    I'm no expert in the Django internals, but does this page have the information you want? docs.djangoproject.com/en/2.1/ref/applications. In particular: It is important to understand that a Django application is just a set of code that interacts with various parts of the framework. There’s no such thing as an Application object. However, there’s a few places where Django needs to interact with installed applications, mainly for configuration and also for introspection. That’s why the application registry maintains metadata in an AppConfig instance for each installed application.
    – Robin Zigmond
    Nov 9 at 15:12










  • @RobinZigmond: thanks. the problem is what exactly configuration and retrospection includes. I can't find it anywhere in the docs. The sentence following, seems to enforce my suspicions that only models matter: There’s no restriction that a project package can’t also be considered an application and have models, etc. (which would require adding it to INSTALLED_APPS).
    – blue_note
    Nov 9 at 15:21













up vote
1
down vote

favorite
1









up vote
1
down vote

favorite
1






1





First of all, the question is technical, not conceptual.



The docs mention, in various places, that you are supposed to put in INSTALLED_APPS the root module of your app. However, what is that module supposed to contain?



Most of the files created by startapp myapp are just there by convention. For example urls, views, admin files are imported from other modules by fully qualified name, and could really be anywhere, so they are just conventions. The only thing that seems to be "hard-coded" in the django logic is the models.py.



So, from the INSTALLED_APPS point of view, does an app consist solely of its models.py? Or is there something else I'm missing? And does the documentation explicitly state this anywhere?










share|improve this question













First of all, the question is technical, not conceptual.



The docs mention, in various places, that you are supposed to put in INSTALLED_APPS the root module of your app. However, what is that module supposed to contain?



Most of the files created by startapp myapp are just there by convention. For example urls, views, admin files are imported from other modules by fully qualified name, and could really be anywhere, so they are just conventions. The only thing that seems to be "hard-coded" in the django logic is the models.py.



So, from the INSTALLED_APPS point of view, does an app consist solely of its models.py? Or is there something else I'm missing? And does the documentation explicitly state this anywhere?







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asked Nov 9 at 15:00









blue_note

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  • 1




    I'm no expert in the Django internals, but does this page have the information you want? docs.djangoproject.com/en/2.1/ref/applications. In particular: It is important to understand that a Django application is just a set of code that interacts with various parts of the framework. There’s no such thing as an Application object. However, there’s a few places where Django needs to interact with installed applications, mainly for configuration and also for introspection. That’s why the application registry maintains metadata in an AppConfig instance for each installed application.
    – Robin Zigmond
    Nov 9 at 15:12










  • @RobinZigmond: thanks. the problem is what exactly configuration and retrospection includes. I can't find it anywhere in the docs. The sentence following, seems to enforce my suspicions that only models matter: There’s no restriction that a project package can’t also be considered an application and have models, etc. (which would require adding it to INSTALLED_APPS).
    – blue_note
    Nov 9 at 15:21














  • 1




    I'm no expert in the Django internals, but does this page have the information you want? docs.djangoproject.com/en/2.1/ref/applications. In particular: It is important to understand that a Django application is just a set of code that interacts with various parts of the framework. There’s no such thing as an Application object. However, there’s a few places where Django needs to interact with installed applications, mainly for configuration and also for introspection. That’s why the application registry maintains metadata in an AppConfig instance for each installed application.
    – Robin Zigmond
    Nov 9 at 15:12










  • @RobinZigmond: thanks. the problem is what exactly configuration and retrospection includes. I can't find it anywhere in the docs. The sentence following, seems to enforce my suspicions that only models matter: There’s no restriction that a project package can’t also be considered an application and have models, etc. (which would require adding it to INSTALLED_APPS).
    – blue_note
    Nov 9 at 15:21








1




1




I'm no expert in the Django internals, but does this page have the information you want? docs.djangoproject.com/en/2.1/ref/applications. In particular: It is important to understand that a Django application is just a set of code that interacts with various parts of the framework. There’s no such thing as an Application object. However, there’s a few places where Django needs to interact with installed applications, mainly for configuration and also for introspection. That’s why the application registry maintains metadata in an AppConfig instance for each installed application.
– Robin Zigmond
Nov 9 at 15:12




I'm no expert in the Django internals, but does this page have the information you want? docs.djangoproject.com/en/2.1/ref/applications. In particular: It is important to understand that a Django application is just a set of code that interacts with various parts of the framework. There’s no such thing as an Application object. However, there’s a few places where Django needs to interact with installed applications, mainly for configuration and also for introspection. That’s why the application registry maintains metadata in an AppConfig instance for each installed application.
– Robin Zigmond
Nov 9 at 15:12












@RobinZigmond: thanks. the problem is what exactly configuration and retrospection includes. I can't find it anywhere in the docs. The sentence following, seems to enforce my suspicions that only models matter: There’s no restriction that a project package can’t also be considered an application and have models, etc. (which would require adding it to INSTALLED_APPS).
– blue_note
Nov 9 at 15:21




@RobinZigmond: thanks. the problem is what exactly configuration and retrospection includes. I can't find it anywhere in the docs. The sentence following, seems to enforce my suspicions that only models matter: There’s no restriction that a project package can’t also be considered an application and have models, etc. (which would require adding it to INSTALLED_APPS).
– blue_note
Nov 9 at 15:21












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Thanks to @RobinZigmond for pointing me to the correct part of the docs.




It seems that indeed, everything is a convention, with the exception of models submodule. The description of the initialization process states that for each app in INSTALLED_APPS




  1. the module myapp is imported. models are not ready yet.

  2. the models submodule if myapp is imported. you must import of define your models in models.py or models/__init__.py

  3. sets the corresponding ready flag to True in the application registry






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    Thanks to @RobinZigmond for pointing me to the correct part of the docs.




    It seems that indeed, everything is a convention, with the exception of models submodule. The description of the initialization process states that for each app in INSTALLED_APPS




    1. the module myapp is imported. models are not ready yet.

    2. the models submodule if myapp is imported. you must import of define your models in models.py or models/__init__.py

    3. sets the corresponding ready flag to True in the application registry






    share|improve this answer

























      up vote
      0
      down vote














      Thanks to @RobinZigmond for pointing me to the correct part of the docs.




      It seems that indeed, everything is a convention, with the exception of models submodule. The description of the initialization process states that for each app in INSTALLED_APPS




      1. the module myapp is imported. models are not ready yet.

      2. the models submodule if myapp is imported. you must import of define your models in models.py or models/__init__.py

      3. sets the corresponding ready flag to True in the application registry






      share|improve this answer























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        up vote
        0
        down vote










        Thanks to @RobinZigmond for pointing me to the correct part of the docs.




        It seems that indeed, everything is a convention, with the exception of models submodule. The description of the initialization process states that for each app in INSTALLED_APPS




        1. the module myapp is imported. models are not ready yet.

        2. the models submodule if myapp is imported. you must import of define your models in models.py or models/__init__.py

        3. sets the corresponding ready flag to True in the application registry






        share|improve this answer













        Thanks to @RobinZigmond for pointing me to the correct part of the docs.




        It seems that indeed, everything is a convention, with the exception of models submodule. The description of the initialization process states that for each app in INSTALLED_APPS




        1. the module myapp is imported. models are not ready yet.

        2. the models submodule if myapp is imported. you must import of define your models in models.py or models/__init__.py

        3. sets the corresponding ready flag to True in the application registry







        share|improve this answer












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        answered Nov 9 at 15:44









        blue_note

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