LoopBack User Friendship

user.json

  {
  "name": "user",
  "plural": "users",
  "base": "User",
  "idInjection": true,
  "options": {
    "validateUpsert": true
  },
  "properties": {},
  "validations": [],
  "relations": {
    "friends": {
      "type": "hasManyThrough",
      "model": "user",
      "foreignKey": "friendsId",
      "through": "Friendship",
      "keyThrough": "???"
    }
  },
  "acls": [],
  "methods": {}
}