Does firebase model many, many relationships using a separate endpoint?

Question

Suppose I have a typical user and group data model where a user can be in many groups and a group can have many users. It seems to me that firebase docs recommend modeling my data by replicating user identifiers within groups and group identifiers inside such users:

{
  "usergroups": {
    "bob": {
      "groups": {
        "one": true,
        "two": true
       }
    },
    "fred": {
      "groups": {
        "one": true
      }
    }
  },
  "groupusers": {
    "one": {
      "users": {
        "bob": true,
        "fred": true
      }
    },
    "two": {
      "users": {
        "bob": true
      }
    }
  }
}

To maintain this structure, whenever my application updates one side of a relationship (for example, adds a user to a group), it also needs to update the other side of the relationship (for example, add a group to a user).

, - - , . , , , firebase.

firebase , , , , .

, , :

{
  "memberships": {
    "id1": {
      "user": "bob",
      "group": "one"
    },
    "id2": {
      "user": "bob",
      "group": "two"
    },
    "id3": {
      "user": "fred",
      "group": "one"
    }
  }
}      

"user" "group" firebase ".orderByChild(" "). equalTo (...)" ".orderByChild(" group "). equalTo (...)" .

? , ? , ?

Answer 1

, :

• users
• memberships, ,
• groups

# 1 # 3, users, groups.

, . , .

NoSQL, , .

, , . , , (, , , ).

.validate, , . , , .

: URL- Firebase