module Groups class ChildrenController < Groups::ApplicationController before_action :group def index parent = if params[:parent_id].present? GroupFinder.new(current_user).execute(id: params[:parent_id]) else @group end if parent.nil? render_404 return end setup_children(parent) respond_to do |format| format.json do serializer = GroupChildSerializer .new(current_user: current_user) .with_pagination(request, response) serializer.expand_hierarchy(parent) if params[:filter].present? render json: serializer.represent(@children) end end end protected def setup_children(parent) @children = GroupDescendantsFinder.new(current_user: current_user, parent_group: parent, params: params).execute @children = @children.page(params[:page]) end end end