Extended Exercises by worktime, difficulty and tags, added ProxyExercises as prework for recommendations

Tags can be added to exercises in the edit view. Tags can monitored under /tags.
Added the concept of ProxyExercises which are a collection of Exercises. They can be found under /proxy_exercises
Added Interventions as prework to show interventions later to the user.
Added exercise/[:id]/working_time to return the working time of the user in this exercise and the average working time of all users in this exercise

app/views/proxy_exercises/_form.html.slim

@@ -0,0 +1,24 @@
+= form_for(@proxy_exercise, multipart: true) do |f|
+  = render('shared/form_errors', object: @proxy_exercise)
+  .form-group
+    = f.label(:title)
+    = f.text_field(:title, class: 'form-control', required: true)
+  .form-group
+    = f.label(:description)
+    = f.pagedown_editor :description
+
+  h3 Exercises
+  .table-responsive
+    table.table
+      thead
+        tr
+          th = t('activerecord.attributes.exercise.selection')
+          th = sort_link(@search, :title, t('activerecord.attributes.submission.exercise'))
+          th = sort_link(@search, :created_at, t('shared.created_at'))
+      = collection_check_boxes :proxy_exercise, :exercise_ids, @exercises, :id, :title do |b|
+        tr
+          td = b.check_box
+          td = link_to(b.object, b.object)
+          td = l(b.object.created_at, format: :short)
+
+  .actions = render('shared/submit_button', f: f, object: @proxy_exercise)

app/views/proxy_exercises/edit.html.slim

@@ -0,0 +1,3 @@
+h1 = t('activerecord.models.proxy_exercise.one', model: ProxyExercise.model_name.human)+ ": " + @proxy_exercise.title
+
+= render('form')

app/views/proxy_exercises/index.html.slim

@@ -0,0 +1,35 @@
+h1 = ProxyExercise.model_name.human(count: 2)
+
+= render(layout: 'shared/form_filters') do |f|
+  .form-group
+    = f.label(:title_cont, t('activerecord.attributes.proxy_exercise.title'), class: 'sr-only')
+    = f.search_field(:title_cont, class: 'form-control', placeholder: t('activerecord.attributes.proxy_exercise.title'))
+
+.table-responsive
+  table.table
+    thead
+      tr
+        th = sort_link(@search, :title, t('activerecord.attributes.proxy_exercise.title'))
+        th = "Token"
+        th = t('activerecord.attributes.proxy_exercise.files_count')
+        th colspan=6 = t('shared.actions')
+    tbody
+      - @proxy_exercises.each do |proxy_exercise|
+        tr data-id=proxy_exercise.id
+          td = link_to(proxy_exercise.title,proxy_exercise)
+          td = proxy_exercise.token
+          td = proxy_exercise.count_files
+          td = link_to(t('shared.edit'), edit_proxy_exercise_path(proxy_exercise)) if policy(proxy_exercise).edit?
+
+          td
+            .btn-group
+              button.btn.btn-primary-outline.btn-xs.dropdown-toggle data-toggle="dropdown" type="button" = t('shared.actions_button')
+              span.caret
+              span.sr-only Toggle Dropdown
+              ul.dropdown-menu.pull-right role="menu"
+                li = link_to(t('shared.show'), proxy_exercise) if policy(proxy_exercise).show?
+                li = link_to(t('shared.destroy'), proxy_exercise, data: {confirm: t('shared.confirm_destroy')}, method: :delete) if policy(proxy_exercise).destroy?
+                li = link_to(t('.clone'), clone_proxy_exercise_path(proxy_exercise), data: {confirm: t('shared.confirm_destroy')}, method: :post) if policy(proxy_exercise).clone?
+
+= render('shared/pagination', collection: @proxy_exercises)
+p = render('shared/new_button', model: ProxyExercise)

app/views/proxy_exercises/new.html.slim

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+h1 = t('shared.new_model', model: ProxyExercise.model_name.human)
+
+= render('form')

app/views/proxy_exercises/reload.json.jbuilder

@@ -0,0 +1,3 @@
+json.set! :files do
+  json.array! @exercise.files.visible, :content, :id
+end

app/views/proxy_exercises/show.html.slim

@@ -0,0 +1,23 @@
+- content_for :head do
+  = javascript_include_tag('http://cdnjs.cloudflare.com/ajax/libs/highlight.js/8.4/highlight.min.js')
+  = stylesheet_link_tag('http://cdnjs.cloudflare.com/ajax/libs/highlight.js/8.4/styles/default.min.css')
+
+h1
+  = @proxy_exercise.title
+  - if policy(@proxy_exercise).edit?
+    = render('shared/edit_button', object: @proxy_exercise)
+
+= row(label: 'exercise.title', value: @proxy_exercise.title)
+= row(label: 'proxy_exercise.files_count', value: @exercises.count)
+= row(label: 'exercise.description', value: @proxy_exercise.description)
+h3 Exercises
+.table-responsive
+  table.table
+    thead
+      tr
+        th = sort_link(@search, :title, t('activerecord.attributes.submission.exercise'))
+        th = sort_link(@search, :created_at, t('shared.created_at'))
+    - @proxy_exercise.exercises.each do |exercise|
+      tr
+        td = link_to(exercise.title, exercise)
+        td = l(exercise.created_at, format: :short)