Merge commenting support

app/controllers/submissions_controller.rb

@@ -44,6 +44,7 @@ class SubmissionsController < ApplicationController
         comment.save!
       end
     end
+  end
 
   def download_file
     if @file.native_file?

app/models/comment.rb

@@ -0,0 +1,6 @@
+class Comment < ActiveRecord::Base
+  # inherit the creation module: encapsulates that this is a polymorphic user, offers some aliases and makes sure that all necessary attributes are set.
+  include Creation
+
+  belongs_to :file, class: CodeOcean::File
+end

app/views/comments/_form.html.erb

@@ -0,0 +1,37 @@
+<%= form_for(@comment) do |f| %>
+  <% if @comment.errors.any? %>
+    <div id="error_explanation">
+      <h2><%= pluralize(@comment.errors.count, "error") %> prohibited this comment from being saved:</h2>
+
+      <ul>
+      <% @comment.errors.full_messages.each do |message| %>
+        <li><%= message %></li>
+      <% end %>
+      </ul>
+    </div>
+  <% end %>
+
+  <div class="field">
+    <%= f.label :user_id %><br>
+    <%= f.text_field :user_id %>
+  </div>
+  <div class="field">
+    <%= f.label :file_id %><br>
+    <%= f.text_field :file_id %>
+  </div>
+  <div class="field">
+    <%= f.label :row %><br>
+    <%= f.number_field :row %>
+  </div>
+  <div class="field">
+    <%= f.label :column %><br>
+    <%= f.number_field :column %>
+  </div>
+  <div class="field">
+    <%= f.label :text %><br>
+    <%= f.text_field :text %>
+  </div>
+  <div class="actions">
+    <%= f.submit %>
+  </div>
+<% end %>

app/views/comments/edit.html.erb

@@ -0,0 +1,6 @@
+<h1>Editing comment</h1>
+
+<%= render 'form' %>
+
+<%= link_to 'Show', @comment %> |
+<%= link_to 'Back', comments_path %>

app/views/comments/index.html.erb

@@ -0,0 +1,33 @@
+<h1>Listing comments</h1>
+
+<table>
+  <thead>
+    <tr>
+      <th>User</th>
+      <th>File</th>
+      <th>Row</th>
+      <th>Column</th>
+      <th>Text</th>
+      <th colspan="3"></th>
+    </tr>
+  </thead>
+
+  <tbody>
+    <% @comments.each do |comment| %>
+      <tr>
+        <td><%= comment.user %></td>
+        <td><%= comment.file %></td>
+        <td><%= comment.row %></td>
+        <td><%= comment.column %></td>
+        <td><%= comment.text %></td>
+        <td><%= link_to 'Show', comment %></td>
+        <td><%= link_to 'Edit', edit_comment_path(comment) %></td>
+        <td><%= link_to 'Destroy', comment, method: :delete, data: { confirm: 'Are you sure?' } %></td>
+      </tr>
+    <% end %>
+  </tbody>
+</table>
+
+<br>
+
+<%= link_to 'New Comment', new_comment_path %>

app/views/comments/index.json.jbuilder

@@ -0,0 +1,4 @@
+json.array!(@comments) do |comment|
+  json.extract! comment, :id, :user_id, :file_id, :row, :column, :text
+  json.url comment_url(comment, format: :json)
+end

app/views/comments/new.html.erb

@@ -0,0 +1,5 @@
+<h1>New comment</h1>
+
+<%= render 'form' %>
+
+<%= link_to 'Back', comments_path %>

app/views/comments/show.html.erb

@@ -0,0 +1,29 @@
+<p id="notice"><%= notice %></p>
+
+<p>
+  <strong>User:</strong>
+  <%= @comment.user %>
+</p>
+
+<p>
+  <strong>File:</strong>
+  <%= @comment.file %>
+</p>
+
+<p>
+  <strong>Row:</strong>
+  <%= @comment.row %>
+</p>
+
+<p>
+  <strong>Column:</strong>
+  <%= @comment.column %>
+</p>
+
+<p>
+  <strong>Text:</strong>
+  <%= @comment.text %>
+</p>
+
+<%= link_to 'Edit', edit_comment_path(@comment) %> |
+<%= link_to 'Back', comments_path %>

app/views/comments/show.json.jbuilder

@@ -0,0 +1 @@
+json.extract! @comment, :id, :user_id, :file_id, :row, :column, :text, :created_at, :updated_at