MongoDb Array Object

[Array]

role:[type:String]

• $addToSet(each循环) 添加

db.collection.update(
   { <query selector> },
   { $addToSet: { <field1>: <value1>, ... } }
)
db.member.update({_id:ObjectId('594200a1167b4102894b11c0')},{$addToSet:{"role":'VIP'}})

db.collection.update(
   { <query selector> },
   { $addToSet: { <field>: {$each:[ <value1>, <value2>, ... ]} } }
)

• $push(each循环) 追加

db.collection.update(
   { <query selector> },
   { $push: { <field1>: <value1>, ... }}
)

db.collection.update(
   { <query selector> },
   { $push: { <field>: {$each:[ <value1>, <value2>, ... ]} } }
)

• $pushAll 批量追加

db.collection.update(
   { <query selector> },
   { $pushAll: { <field>: [ <value1>, <value2>, ... ] } }
)

db.collection.update(
   { <query selector> },
   {
  $push: {
    <field>: {
       $each: [ <value1>, <value2>, ... ],
       $position: <num>
    }
  }
})

• $pull 删除

db.collection.update(
   { <query selector> },
   { $pull: { <field1>: <value1>, ... } }
)
db.member.update({_id:ObjectId('594200a1167b4102894b11c0')},{$pull:{"role":'VIP'}})

• pullAll 批量删除

db.collection.update(
   { <query selector> },
   { $pullAll: { <field1>: [ <value1>, <value2> ... ], ... } }
)

• $pop 删除

db.collection.update(
   { <query selector> },
   { $pop: { <field>: <-1 | 1>, ... } }
)
1:左边第一位／-1:右边第一位

• $set 修改

db.collection.update(
   { <array>: value ... },
   { <update operator>: { "<array>.$" : value } }
)
db.member.update({_id:ObjectId('594200a1167b4102894b11c0'),'role':'VIP'},{$set:{"role.$":'System'}})

• $slice 合并并保留一定的位数

db.collection.update(
   { <array>: value ... },
   {
  $push: {
     <field>: {
       $each: [ <value1>, <value2>, ... ],
       $slice: <num>
     }
  }
})

num：正数表示从头部（左边）开始，负数表示从尾部（右边）开始

[{Object}]

• $set 添加／修改

//修改
db.collection.update(
   { <query selector> },
   { $set: { "array.$.field" : value } }
)
//添加
db.member.update({_id:ObjectId('594200a1167b4102894b11c0')},{$set:{"oAuth.weibo":'QQId'}},{upsert:true})