feat: GraphQL schema

server/models/_relations.js

@@ -5,6 +5,7 @@
  */
 module.exports = db => {
   db.User.belongsToMany(db.Group, { through: 'userGroups' })
+  db.Group.belongsToMany(db.User, { through: 'userGroups' })
   db.Group.hasMany(db.Right, { as: 'groupRights' })
   db.Document.hasMany(db.Tag, { as: 'documentTags' })
   db.File.belongsTo(db.Folder)