MongoDB provides different types of array update operators to update the values of the array fields in the documents and Show
Syntax: { $push: { <field1>: <value1>, ... } } Here, <field> can specify with dot notation in embedded/nested documents or an array.
We can also use the following modifiers with the $push operator : { $push: { <field1>: { <modifier1>: <value1>, ... }, ... } } The processing of the push operation with modifiers works in the following order:
Note: Here the order in which the modifiers appear in the $push operator does not matter.
In the following examples, we are working with:
Appending a single value to an array:In this example, we are appending a single value, i.e., “C++” to an array field, i.e., language field in the document that satisfy the condition(name: “Rohit”).
Appending multiple values to an array:In this example, we are appending multiple values, i.e., [“C”, “Ruby”, “Go”] to an array field, i.e., language field in the document that satisfy the condition(name: “Sumit”).
Appending multiple values to an array in the nested/embedded document:In this example, we are appending multiple values, i.e., [89, 76.4] to an array field, i.e., personal.semesterMarks field of a nested/embedded document.
Use of modifiers with $push operator:In this example, we are using multiple modifiers like $each, $sort, and $slice with $push operator.
Here,
How do I push a value into an array in MongoDB?In MongoDB, the $push operator is used to appends a specified value to an array. If the mentioned field is absent in the document to update, the $push operator add it as a new field and includes mentioned value as its element. If the updating field is not an array type field the operation failed.
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.
What is $Push in MongoDB?MongoDB provides different types of array update operators to update the values of the array fields in the documents and $push operator is one of them. This operator is used to append a specified value to an array. Syntax: { $push: { <field1>: <value1>, ... } }
How do I add an array of documents in MongoDB?insertMany() can insert multiple documents into a collection. Pass an array of documents to the method. The following example inserts three new documents into the inventory collection. If the documents do not specify an _id field, MongoDB adds the _id field with an ObjectId value to each document.
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