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Delete data in MongoDB (part 2)

The deleteMany() method allows you to remove all documents that match a condition from a collection.

The deleteMany() has the following syntax:

db.collection.deleteMany(filter, option)

In this syntax:

  • filter is a document that specifies deletion criteria. If the filter is an empty document {}, the deleteMany() method will delete all documents from the collection.
  • option is a document that specifies the deletion option.

Launch mongo shell from the Terminal on Linux and connect to the productdb database on the local MongoDB server: mongosh productdb We’ll use the following products collection for the projection examples:

db.products.insertMany([
    { "_id" : 1, "name" : "xPhone", "price" : 799, "releaseDate": ISODate("2011-05-14"), "spec" : { "ram" : 4, "screen" : 6.5, "cpu" : 2.66 },"color":["white","black"],"storage":[64,128,256],"inventory":[{ qty: 1200,"warehouse": "San Jose"}]},
    { "_id" : 2, "name" : "xTablet", "price" : 899, "releaseDate": ISODate("2011-09-01") , "spec" : { "ram" : 16, "screen" : 9.5, "cpu" : 3.66 },"color":["white","black","purple"],"storage":[128,256,512],"inventory":[{ qty: 300,"warehouse": "San Francisco"}]},
    { "_id" : 3, "name" : "SmartTablet", "price" : 899, "releaseDate": ISODate("2015-01-14"), "spec" : { "ram" : 12, "screen" : 9.7, "cpu" : 3.66 },"color":["blue"],"storage":[16,64,128],"inventory":[{ qty: 400,"warehouse": "San Jose"},{ qty: 200,"warehouse": "San Francisco"}]},
    { "_id" : 4, "name" : "SmartPad", "price" : 699, "releaseDate": ISODate("2020-05-14"),"spec" : { "ram" : 8, "screen" : 9.7, "cpu" : 1.66 },"color":["white","orange","gold","gray"],"storage":[128,256,1024],"inventory":[{ qty: 1200,"warehouse": "San Mateo"}]},
    { "_id" : 5, "name" : "SmartPhone", "price" : 599,"releaseDate": ISODate("2022-09-14"), "spec" : { "ram" : 4, "screen" : 5.7, "cpu" : 1.66 },"color":["white","orange","gold","gray"],"storage":[128,256]}
 ])

Using the deleteMany() method to delete multiple documents

The following example uses the deleteMany() method to delete all documents where the value in the price field is 899:

db.products.deleteMany({ price: 899 })

In this example, the filter argument is { price: 899 } that matches documents whose price is 899.

Using the deleteMany() method to delete all documents

The following query uses the deleteMany() method to delete all documents from the products collection:

db.products.deleteMany({})

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