How do i push data into an array in mongodb?
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Definition¶$push ¶The The
{ $push: { <field1>: <value1>, ... } } To specify a Behavior¶If the field is absent in the document to update, If the field is not an array, the operation will fail. If the value is an array,
Modifiers¶You can use the
When used with modifiers, the { $push: { <field1>: { <modifier1>: <value1>, ... }, ... } } The processing of the
Examples¶Append a Value to an Array¶The following example
appends db.students.update( { _id: 1 }, { $push: { scores: 89 } } ) Append a Value to Arrays in Multiple Documents¶Add the following documents to the db.students.insertMany( [ { _id: 2, scores: [ 45, 78, 38, 80, 89 ] } , { _id: 3, scores: [ 46, 78, 38, 80, 89 ] } , { _id: 4, scores: [ 47, 78, 38, 80, 89 ] } ] ) The following
db.students.updateMany( { }, { $push: { scores: 95 } } ) To confirm that each The operation returns the following results: [ { _id: 1, scores: [ 44, 78, 38, 80, 89, 95 ] }, { _id: 2, scores: [ 45, 78, 38, 80, 89, 95 ] }, { _id: 3, scores: [ 46, 78, 38, 80, 89, 95 ] }, { _id: 4, scores: [ 47, 78, 38, 80, 89, 95 ] } ] Append Multiple Values to an Array¶Use The following example appends each element of db.students.update( { name: "joe" }, { $push: { scores: { $each: [ 90, 92, 85 ] } } } ) Use $push Operator with Multiple Modifiers¶A collection { "_id" : 5, "quizzes" : [ { "wk": 1, "score" : 10 }, { "wk": 2, "score" : 8 }, { "wk": 3, "score" : 5 }, { "wk": 4, "score" : 6 } ] } The following
db.students.update( { _id: 5 }, { $push: { quizzes: { $each: [ { wk: 5, score: 8 }, { wk: 6, score: 7 }, { wk: 7, score: 6 } ], $sort: { score: -1 }, $slice: 3 } } } ) The result of the operation is keep only the three highest scoring quizzes: { "_id" : 5, "quizzes" : [ { "wk" : 1, "score" : 10 }, { "wk" : 2, "score" : 8 }, { "wk" : 5, "score" : 8 } ] } How do I push in MongoDB?The $push operator insert items at the end of the array. If the specified field in the $push operator is not an array, then this operation will fails. If the value of the $push operator is an array, then this operator will append the whole array as a single element.
What MongoDB method would you use to insert an array of data?MongoDB Array of Objects using insert() with Example
The “insert” command can also be used to insert multiple documents into a collection at one time.
How do I update an array in MongoDB?You can use the updateOne() or updateMany() methods to add, update, or remove array elements based on the specified criteria. It is recommended to use the updateMany() method to update multiple arrays in a collection.
How do arrays work in MongoDB?Working with Arrays in MongoDB. Introduction. ... . Create and Query a Document. ... . Add an Array Element. ... . Update an Array Element. ... . Delete an Array Element. ... . Add a New Field to all Objects in the Array. ... . Update a Specific Array Element Based on a Condition. ... . Conclusion.. |