MongoDB: How do I update a single subelement in an array, referenced by the index within the array?
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I'm trying to update a single subelement contained within an array in a mongodb document. I want to reference the field using its array index (elements within the array don't have any fields that I can guarantee will be unique identifiers). Seems like this should be easy to do, but I can't figure out the syntax.
Here's what I want to do in pseudo-json.
Before:
{
_id : ...,
other_stuff ... ,
my_array : [
{ ... old content A ... },
{ ... old content B ... },
{ ... old content C ... }
]
}
After:
{
_id : ...,
other_stuff ... ,
my_array : [
{ ... old content A ... },
{ ... NEW content B ... },
{ ... old content C ... }
]
}
Seems like the query should be something like this:
//pseudocode
db.my_collection.update(
{_id: ObjectId(document_id), my_array.1 : 1 },
{my_array.$.content: NEW content B }
)
But this doesn't work. I've spent way too long searching the mongodb docs, and trying different variations on this syntax (e.g. using $slice, etc.). I can't find any clear explanation of how to accomplish this kind of update in MongoDB.
arrays mongodb
edited Sep 12 '17 at 17:18
Massimiliano Kraus
2,39941633
asked Jul 7 '12 at 3:39
AbeAbe
6,784146197
add a comment |
I'm trying to update a single subelement contained within an array in a mongodb document. I want to reference the field using its array index (elements within the array don't have any fields that I can guarantee will be unique identifiers). Seems like this should be easy to do, but I can't figure out the syntax.
Here's what I want to do in pseudo-json.
Before:
{
_id : ...,
other_stuff ... ,
my_array : [
{ ... old content A ... },
{ ... old content B ... },
{ ... old content C ... }
]
}
After:
{
_id : ...,
other_stuff ... ,
my_array : [
{ ... old content A ... },
{ ... NEW content B ... },
{ ... old content C ... }
]
}
Seems like the query should be something like this:
//pseudocode
db.my_collection.update(
{_id: ObjectId(document_id), my_array.1 : 1 },
{my_array.$.content: NEW content B }
)
But this doesn't work. I've spent way too long searching the mongodb docs, and trying different variations on this syntax (e.g. using $slice, etc.). I can't find any clear explanation of how to accomplish this kind of update in MongoDB.
arrays mongodb
edited Sep 12 '17 at 17:18
Massimiliano Kraus
2,39941633
asked Jul 7 '12 at 3:39
AbeAbe
6,784146197
add a comment |
I'm trying to update a single subelement contained within an array in a mongodb document. I want to reference the field using its array index (elements within the array don't have any fields that I can guarantee will be unique identifiers). Seems like this should be easy to do, but I can't figure out the syntax.
Here's what I want to do in pseudo-json.
Before:
{
_id : ...,
other_stuff ... ,
my_array : [
{ ... old content A ... },
{ ... old content B ... },
{ ... old content C ... }
]
}
After:
{
_id : ...,
other_stuff ... ,
my_array : [
{ ... old content A ... },
{ ... NEW content B ... },
{ ... old content C ... }
]
}
Seems like the query should be something like this:
//pseudocode
db.my_collection.update(
{_id: ObjectId(document_id), my_array.1 : 1 },
{my_array.$.content: NEW content B }
)
But this doesn't work. I've spent way too long searching the mongodb docs, and trying different variations on this syntax (e.g. using $slice, etc.). I can't find any clear explanation of how to accomplish this kind of update in MongoDB.
arrays mongodb
edited Sep 12 '17 at 17:18
Massimiliano Kraus
2,39941633
asked Jul 7 '12 at 3:39
AbeAbe
6,784146197
I'm trying to update a single subelement contained within an array in a mongodb document. I want to reference the field using its array index (elements within the array don't have any fields that I can guarantee will be unique identifiers). Seems like this should be easy to do, but I can't figure out the syntax.
Here's what I want to do in pseudo-json.
Before:
{
_id : ...,
other_stuff ... ,
my_array : [
{ ... old content A ... },
{ ... old content B ... },
{ ... old content C ... }
]
}
After:
{
_id : ...,
other_stuff ... ,
my_array : [
{ ... old content A ... },
{ ... NEW content B ... },
{ ... old content C ... }
]
}
Seems like the query should be something like this:
//pseudocode
db.my_collection.update(
{_id: ObjectId(document_id), my_array.1 : 1 },
{my_array.$.content: NEW content B }
)
But this doesn't work. I've spent way too long searching the mongodb docs, and trying different variations on this syntax (e.g. using $slice, etc.). I can't find any clear explanation of how to accomplish this kind of update in MongoDB.
arrays mongodb
arrays mongodb
edited Sep 12 '17 at 17:18
Massimiliano Kraus
2,39941633
asked Jul 7 '12 at 3:39
AbeAbe
6,784146197
edited Sep 12 '17 at 17:18
Massimiliano Kraus
2,39941633
asked Jul 7 '12 at 3:39
AbeAbe
6,784146197
edited Sep 12 '17 at 17:18
Massimiliano Kraus
2,39941633
edited Sep 12 '17 at 17:18
Massimiliano Kraus
2,39941633
edited Sep 12 '17 at 17:18
Massimiliano Kraus
2,39941633
2,39941633
asked Jul 7 '12 at 3:39
AbeAbe
6,784146197
asked Jul 7 '12 at 3:39
AbeAbe
6,784146197
asked Jul 7 '12 at 3:39
AbeAbe
6,784146197
6,784146197
add a comment |
add a comment |
4 Answers
4
active
oldest
votes
As expected, the query is easy once you know how. Here's the syntax, in python:
db["my_collection"].update(
{ "_id": ObjectId(document_id) },
{ "$set": { 'documents.'+str(doc_index)+'.content' : new_content_B}}
)
answered Jul 7 '12 at 14:29
AbeAbe
6,784146197
2
where is this documented?
– ROROROOROROR
May 14 '18 at 3:49
add a comment |
Update of an array element referenced by an index (e.g. 1 ) in Mongo Shell can also be done by directly indicating the index value:
db.my_collection.update(
{_id : "document_id"},
{$set : {"my_array.1.content" : "New content B"}}
)
edited Sep 12 '17 at 17:19
Massimiliano Kraus
2,39941633
answered Dec 9 '15 at 11:40
tomaskazemekastomaskazemekas
2,36722129
add a comment |
In mongo style, using '$' positional operator.
Check out this link for details.
db.my_collection.update(
{_id: ObjectId(document_id), my_array.1 : 1 },
{ $set: { "my_array.$.content" : "NEW content B" } }
)
edited Aug 13 '17 at 15:12
ThisClark
8,46874869
answered May 5 '15 at 17:03
DoelDoel
427412
add a comment |
db.my_collection.update(
{_id: ObjectId(document_id), my_array : { ... old content A ... } },
{ $set: { "my_array.$.content" : "NEW content B" } }
)
answered Jul 21 '17 at 10:48
znbwoznbwo
5111
add a comment |
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4 Answers
4
active
oldest
votes
4 Answers
4
active
oldest
votes
active
oldest
votes
active
oldest
votes
As expected, the query is easy once you know how. Here's the syntax, in python:
db["my_collection"].update(
{ "_id": ObjectId(document_id) },
{ "$set": { 'documents.'+str(doc_index)+'.content' : new_content_B}}
)
answered Jul 7 '12 at 14:29
AbeAbe
6,784146197
2
where is this documented?
– ROROROOROROR
May 14 '18 at 3:49
add a comment |
As expected, the query is easy once you know how. Here's the syntax, in python:
db["my_collection"].update(
{ "_id": ObjectId(document_id) },
{ "$set": { 'documents.'+str(doc_index)+'.content' : new_content_B}}
)
answered Jul 7 '12 at 14:29
AbeAbe
6,784146197
2
where is this documented?
– ROROROOROROR
May 14 '18 at 3:49
add a comment |
As expected, the query is easy once you know how. Here's the syntax, in python:
db["my_collection"].update(
{ "_id": ObjectId(document_id) },
{ "$set": { 'documents.'+str(doc_index)+'.content' : new_content_B}}
)
answered Jul 7 '12 at 14:29
AbeAbe
6,784146197
As expected, the query is easy once you know how. Here's the syntax, in python:
db["my_collection"].update(
{ "_id": ObjectId(document_id) },
{ "$set": { 'documents.'+str(doc_index)+'.content' : new_content_B}}
)
answered Jul 7 '12 at 14:29
AbeAbe
6,784146197
answered Jul 7 '12 at 14:29
AbeAbe
6,784146197
answered Jul 7 '12 at 14:29
AbeAbe
6,784146197
answered Jul 7 '12 at 14:29
AbeAbe
6,784146197
6,784146197
2
where is this documented?
– ROROROOROROR
May 14 '18 at 3:49
add a comment |
2
where is this documented?
– ROROROOROROR
May 14 '18 at 3:49
2
2
where is this documented?
– ROROROOROROR
May 14 '18 at 3:49
where is this documented?
– ROROROOROROR
May 14 '18 at 3:49
add a comment |
Update of an array element referenced by an index (e.g. 1 ) in Mongo Shell can also be done by directly indicating the index value:
db.my_collection.update(
{_id : "document_id"},
{$set : {"my_array.1.content" : "New content B"}}
)
edited Sep 12 '17 at 17:19
Massimiliano Kraus
2,39941633
answered Dec 9 '15 at 11:40
tomaskazemekastomaskazemekas
2,36722129
add a comment |
Update of an array element referenced by an index (e.g. 1 ) in Mongo Shell can also be done by directly indicating the index value:
db.my_collection.update(
{_id : "document_id"},
{$set : {"my_array.1.content" : "New content B"}}
)
edited Sep 12 '17 at 17:19
Massimiliano Kraus
2,39941633
answered Dec 9 '15 at 11:40
tomaskazemekastomaskazemekas
2,36722129
add a comment |
Update of an array element referenced by an index (e.g. 1 ) in Mongo Shell can also be done by directly indicating the index value:
db.my_collection.update(
{_id : "document_id"},
{$set : {"my_array.1.content" : "New content B"}}
)
edited Sep 12 '17 at 17:19
Massimiliano Kraus
2,39941633
answered Dec 9 '15 at 11:40
tomaskazemekastomaskazemekas
2,36722129
Update of an array element referenced by an index (e.g. 1 ) in Mongo Shell can also be done by directly indicating the index value:
db.my_collection.update(
{_id : "document_id"},
{$set : {"my_array.1.content" : "New content B"}}
)
edited Sep 12 '17 at 17:19
Massimiliano Kraus
2,39941633
answered Dec 9 '15 at 11:40
tomaskazemekastomaskazemekas
2,36722129
edited Sep 12 '17 at 17:19
Massimiliano Kraus
2,39941633
edited Sep 12 '17 at 17:19
Massimiliano Kraus
2,39941633
edited Sep 12 '17 at 17:19
Massimiliano Kraus
2,39941633
2,39941633
answered Dec 9 '15 at 11:40
tomaskazemekastomaskazemekas
2,36722129
answered Dec 9 '15 at 11:40
tomaskazemekastomaskazemekas
2,36722129
answered Dec 9 '15 at 11:40
tomaskazemekastomaskazemekas
2,36722129
2,36722129
add a comment |
add a comment |
In mongo style, using '$' positional operator.
Check out this link for details.
db.my_collection.update(
{_id: ObjectId(document_id), my_array.1 : 1 },
{ $set: { "my_array.$.content" : "NEW content B" } }
)
edited Aug 13 '17 at 15:12
ThisClark
8,46874869
answered May 5 '15 at 17:03
DoelDoel
427412
add a comment |
In mongo style, using '$' positional operator.
Check out this link for details.
db.my_collection.update(
{_id: ObjectId(document_id), my_array.1 : 1 },
{ $set: { "my_array.$.content" : "NEW content B" } }
)
edited Aug 13 '17 at 15:12
ThisClark
8,46874869
answered May 5 '15 at 17:03
DoelDoel
427412
add a comment |
In mongo style, using '$' positional operator.
Check out this link for details.
db.my_collection.update(
{_id: ObjectId(document_id), my_array.1 : 1 },
{ $set: { "my_array.$.content" : "NEW content B" } }
)
edited Aug 13 '17 at 15:12
ThisClark
8,46874869
answered May 5 '15 at 17:03
DoelDoel
427412
In mongo style, using '$' positional operator.
Check out this link for details.
db.my_collection.update(
{_id: ObjectId(document_id), my_array.1 : 1 },
{ $set: { "my_array.$.content" : "NEW content B" } }
)
edited Aug 13 '17 at 15:12
ThisClark
8,46874869
answered May 5 '15 at 17:03
DoelDoel
427412
edited Aug 13 '17 at 15:12
ThisClark
8,46874869
edited Aug 13 '17 at 15:12
ThisClark
8,46874869
edited Aug 13 '17 at 15:12
ThisClark
8,46874869
8,46874869
answered May 5 '15 at 17:03
DoelDoel
427412
answered May 5 '15 at 17:03
DoelDoel
427412
answered May 5 '15 at 17:03
DoelDoel
427412
427412
add a comment |
add a comment |
db.my_collection.update(
{_id: ObjectId(document_id), my_array : { ... old content A ... } },
{ $set: { "my_array.$.content" : "NEW content B" } }
)
answered Jul 21 '17 at 10:48
znbwoznbwo
5111
add a comment |
db.my_collection.update(
{_id: ObjectId(document_id), my_array : { ... old content A ... } },
{ $set: { "my_array.$.content" : "NEW content B" } }
)
answered Jul 21 '17 at 10:48
znbwoznbwo
5111
add a comment |
db.my_collection.update(
{_id: ObjectId(document_id), my_array : { ... old content A ... } },
{ $set: { "my_array.$.content" : "NEW content B" } }
)
answered Jul 21 '17 at 10:48
znbwoznbwo
5111
db.my_collection.update(
{_id: ObjectId(document_id), my_array : { ... old content A ... } },
{ $set: { "my_array.$.content" : "NEW content B" } }
)
answered Jul 21 '17 at 10:48
znbwoznbwo
5111
answered Jul 21 '17 at 10:48
znbwoznbwo
5111
answered Jul 21 '17 at 10:48
znbwoznbwo
5111
answered Jul 21 '17 at 10:48
znbwoznbwo
5111
5111
add a comment |
add a comment |
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