added search intervention. search opens new tab with search in the java course (at least in chrome)

send only 3 interventions per exercise at maximum

app/controllers/exercises_controller.rb

@@ -156,11 +156,13 @@ class ExercisesController < ApplicationController
   def implement
     redirect_to(@exercise, alert: t('exercises.implement.no_files')) unless @exercise.files.visible.exists?
     @show_interventions =
-      if UserExerciseIntervention.find_by(exercise: @exercise, user: current_user)
+      if UserExerciseIntervention.where(exercise: @exercise, user: current_user).count >= 3
         "false"
       else
         "true"
       end
+    @search = Search.new
+    @search.exercise = @exercise
     @submission = current_user.submissions.where(exercise_id: @exercise.id).order('created_at DESC').first
     @files = (@submission ? @submission.collect_files : @exercise.files).select(&:visible).sort_by(&:name_with_extension)
     @paths = collect_paths(@files)

app/controllers/searches_controller.rb

@@ -0,0 +1,34 @@
+class SearchesController < ApplicationController
+  include CommonBehavior
+
+  def authorize!
+    authorize(@search || @searchs)
+  end
+  private :authorize!
+
+
+  def create
+    @search = Search.new(search_params)
+    @search.user = current_user
+    authorize!
+
+    respond_to do |format|
+      if @search.save
+        path = implement_exercise_path(@search.exercise)
+        respond_with_valid_object(format, path: path, status: :created)
+      end
+    end
+  end
+
+  def search_params
+    params[:search].permit(:search, :exercise_id)
+  end
+  private :search_params
+
+  def index
+    @search = policy_scope(ProxyExercise).search(params[:q])
+    @searches = @search.result.order(:title).paginate(page: params[:page])
+    authorize!
+  end
+
+end