refactor: knex remaining models

server/db/models/groups.js

@@ -1,7 +1,7 @@
 const Model = require('objection').Model
 
 /**
- * Settings model
+ * Groups model
  */
 module.exports = class Group extends Model {
   static get tableName() { return 'groups' }
@@ -21,11 +21,10 @@ module.exports = class Group extends Model {
   }
 
   static get relationMappings() {
-    const User = require('./users')
     return {
       users: {
         relation: Model.ManyToManyRelation,
-        modelClass: User,
+        modelClass: require('./users'),
         join: {
           from: 'groups.id',
           through: {