Normally we use $push to push or append the element or object into an array in mongoDB. But sometime we may need to push the multiple objects into mongoDB array document. Here below I'll try to explain how we can do that.
Let say I have a collection of favorite products and the collection name is favorite_products.
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{
'productId':123,
'users':[
{'id':1,'name': 'saurabh'},
{'id':2,'name': 'gaurav'},
{'id':3,'name': 'coding4developers'}
]
},
{
'productId':124,
'users':[
{'id':4,'name': 'pankaj'},
{'id':2,'name': 'gaurav'}
]
}
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Now in the above document, I wanted to push/append the multiple user objects into the users array whose product id is 124.
An array of the object which I wanted to push is given below:
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[ {'id':6,'name': 'sakshi'}, {'id':8,'name': 'urvi'}, {'id':9,'name': 'yakshi'} ]
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I'll use $each with $push to push/append the multiple object into mongoDB array and the query is given below:
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db.students.update(
{ productId: "124" },
{ $push: { users: { $each: [ {'id':6,'name': 'sakshi'}, {'id':8,'name': 'urvi'}, {'id':9,'name': 'yakshi'} ] } } }
)
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More from my site
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MongoDB distinct with array of objects | Getting distinct values from object array MongoDB
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MongoDB – Update objects in a document’s array | MongoDB update object in Array
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What is MongoDB?
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MongoDB insertMany() document size | How to check maxWriteBatchSize in MongoDB
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MongoDB find match in array of objects || MongoDB where condition with array of objects | $elemMatch or dot notation match
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Node JS with mongoose | Create schema | Save data to mongodb in node js
Is there any way to check individual users is present or not before pushing?
use $addToSet. The only difference between $push and $addToSet is that $addToSet won't update the document if it already exist while $push will simply push and update the document.