remove value from document
- $unset
> db.users.update({ name : 'Zorg' }, { $unset : { child : true } } )
> db.users.find()
{ "_id" : ObjectId("526b8fdba444e81f1ca06ba2"), "name" : "Foo" }
{
"_id" : ObjectId("526b9048a444e81f1ca06ba3"),
"name" : "Zorg",
"kids" : [
{
"name" : "Jane"
}
]
}
{ "_id" : ObjectId("526ba048a444e81f1ca06ba4"), "name" : "Moo" }