![$PUSHAdd a array to the exisitng document
> db.user.findOne()
{
"_id" : ObjectId("513c6ef1cfce9090d3fd8b1d"),
"uName" : "anish",
"date" : ISODate("2013-03-10T11:30:50.555Z"),
"age" : 33
}
PUSH the remark array in the document
db.user.update({"_id" : ObjectId("513c6ef1cfce9090d3fd8b1d")}, {$push : {"remarks" : {"name":"anish","rate":"good"}}})
> db.user.findOne()
{
"_id" : ObjectId("513c6ef1cfce9090d3fd8b1d"),
"date" : ISODate("2013-03-10T11:30:50.555Z"),
"remarks" : [
{
"name" : "anish",
"rate" : "good"
}
],
"uName" : "anish"
}
Add existing to the remarks array
> db.user.update({"_id" : ObjectId("513c6ef1cfce9090d3fd8b1d")}, {$push : {"remarks" : {"name":"nath","rate":"bad"
> db.user.findOne()
{
"_id" : ObjectId("513c6ef1cfce9090d3fd8b1d"),
"date" : ISODate("2013-03-10T11:30:50.555Z"),
"remarks" : [
{
"name" : "anish",
"rate" : "good"
},
{
"name" : "nath",
"rate" : "bad"
}
],
"uName" : "anish"
}](https://image.slidesharecdn.com/mongodbmodifiers-130502145345-phpapp01/85/Mongo-db-modifiers-5-320.jpg)
Mongo db modifiers
- 2. $inc> db.user.findOne() { "_id" : ObjectId("513c6ef1cfce9090d3fd8b1d"), "uName" : "anish", "date" : ISODate("2013-03-10T11:30:50.555Z"), "age" : 32 } Increment the uName=anish age to 1 > db.user.update({"_id" : ObjectId("513c6ef1cfce9090d3fd8b1d")},{"$inc" : {"age" : 1}}) > db.user.findOne() { "_id" : ObjectId("513c6ef1cfce9090d3fd8b1d"), "uName" : "anish", "date" : ISODate("2013-03-10T11:30:50.555Z"), "age" : 33 }
- 3. $set > db.user.findOne() { "_id" : ObjectId("513c6ef1cfce9090d3fd8b1d"), "uName" : "anish", "date" : ISODate("2013-03-10T11:30:50.555Z"), "age" : 33 } Set the uName=anish age to 31 > db.user.update({"_id" : ObjectId("513c6ef1cfce9090d3fd8b1d")},{"$set" : {"age" : 31}}) > db.user.findOne() { "_id" : ObjectId("513c6ef1cfce9090d3fd8b1d"), "uName" : "anish", "date" : ISODate("2013-03-10T11:30:50.555Z"), "age" : 31, }
- 4. $unset > db.user.findOne() { "_id" : ObjectId("513c6ef1cfce9090d3fd8b1d"), "uName" : "anish", "date" : ISODate("2013-03-10T11:30:50.555Z"), "age" : 33 } Remove the age key > db.user.update({"_id" : ObjectId("513c6ef1cfce9090d3fd8b1d")},{"$unset" : {"age" : 31}}) > db.user.findOne() { "_id" : ObjectId("513c6ef1cfce9090d3fd8b1d"), "date" : ISODate("2013-03-10T11:30:50.555Z"), "uName" : "anish" }
- 5. $PUSHAdd a array to the exisitng document > db.user.findOne() { "_id" : ObjectId("513c6ef1cfce9090d3fd8b1d"), "uName" : "anish", "date" : ISODate("2013-03-10T11:30:50.555Z"), "age" : 33 } PUSH the remark array in the document db.user.update({"_id" : ObjectId("513c6ef1cfce9090d3fd8b1d")}, {$push : {"remarks" : {"name":"anish","rate":"good"}}}) > db.user.findOne() { "_id" : ObjectId("513c6ef1cfce9090d3fd8b1d"), "date" : ISODate("2013-03-10T11:30:50.555Z"), "remarks" : [ { "name" : "anish", "rate" : "good" } ], "uName" : "anish" } Add existing to the remarks array > db.user.update({"_id" : ObjectId("513c6ef1cfce9090d3fd8b1d")}, {$push : {"remarks" : {"name":"nath","rate":"bad" > db.user.findOne() { "_id" : ObjectId("513c6ef1cfce9090d3fd8b1d"), "date" : ISODate("2013-03-10T11:30:50.555Z"), "remarks" : [ { "name" : "anish", "rate" : "good" }, { "name" : "nath", "rate" : "bad" } ], "uName" : "anish" }