Add filters to index page

app/controllers/user_exercise_feedbacks_controller.rb

@@ -21,7 +21,8 @@ class UserExerciseFeedbacksController < ApplicationController
   end
 
   def index
-    @uefs = UserExerciseFeedback.order(:id).paginate(page: params[:page])
+    @search = UserExerciseFeedback.all.search params[:q]
+    @uefs = @search.result.includes(:execution_environment).order(:id).paginate(page: params[:page])
     authorize!
   end
 

app/models/user_exercise_feedback.rb

@@ -2,6 +2,7 @@ class UserExerciseFeedback < ActiveRecord::Base
   include Creation
 
   belongs_to :exercise
+  has_one :execution_environment, through: :exercise
 
   validates :user_id, uniqueness: { scope: [:exercise_id, :user_type] }
 

app/views/user_exercise_feedbacks/index.html.slim

@@ -1,5 +1,13 @@
 h1 = UserExerciseFeedback.model_name.human(count: 2)
 
+= render(layout: 'shared/form_filters') do |f|
+  .form-group
+    = f.label(:execution_environment_id_eq, t('activerecord.attributes.exercise.execution_environment'), class: 'sr-only')
+    = f.collection_select(:execution_environment_id_eq, ExecutionEnvironment.with_exercises, :id, :name, class: 'form-control', prompt: t('activerecord.attributes.exercise.execution_environment'))
+  .form-group
+    = f.label(:exercise_title_cont, t('activerecord.attributes.request_for_comments.exercise'), class: 'sr-only')
+    = f.search_field(:exercise_title_cont, class: 'form-control', placeholder: t('activerecord.attributes.request_for_comments.exercise'))
+
 .table-responsive
   table.table
     thead