{
  "schema": {
    "bsonType": "object",
    "required": ["friend_uid", "follow_uid"],
     "permission": {
      "read": true, 
      "create": "auth.uid != null", 
      "update": false,
      "delete": "doc.follow_uid == auth.uid || doc.friend_uid == auth.uid"
    },
    "properties": {
      "_id": {
        "description": "ID，系统自动生成"
      },
      "friend_uid": {
        "bsonType": "string",
        "description": "被关注者user_id，参考uni-id-users表"
      },
      "follow_uid": {
        "bsonType": "string",
        "description": "关注者user_id，参考uni-id-users表",
        "forceDefaultValue": {
          "$env": "uid"
        }
      },
      "create_date": {
        "bsonType": "timestamp",
        "description": "创建时间",
        "forceDefaultValue": {
          "$env": "now"
        }
      }
    }
  },
  "index": [
    {
      "IndexName": "follow_user_",
      "MgoKeySchema": {
        "MgoIndexKeys": [
          {
            "Name": "friend_uid",
            "Direction": "1"
          },
          {
            "Name": "follow_uid",
            "Direction": "1"
          }
        ],
        "MgoIsUnique": true
      }
    }
  ]
}