如何从mongodb中的数组中删除一个object

Question

How to delete or remove any object inside mainlist array

 _id:ObjectId("5fafc5aec2b84c301845c55a"),
    username:"test",
       mainList:[
           {
             _id:ObjectId("5fafdf1a5b49510c789af0ae"),
             name:"testname",
             lastname:"testlastname"
           },
           {
            _id:ObjectId("5fafdf1a5b49510c789af0af"),
            name:"testname",
            lastname:"testlastname"
            }
         ]

Answer 1

You can use the $pull operator

{ $pull: { <field1>: <value|condition>, <field2>: <value|condition>, ... } }