Show author names in problem and translation views

app/controllers/translations_controller.rb

@@ -13,6 +13,9 @@ class TranslationsController < ApplicationController
   # POST /translations
   def create
     @translation = @problem.translations.new(translation_params)
+    if user_signed_in?
+      @translation.author = current_user
+    end
     if @translation.save
       redirect_to @problem, notice: t('translations.notice.successfully_created')
     else

app/models/problem.rb

@@ -4,7 +4,8 @@ class Problem < ApplicationRecord
   delegate :title, :content, to: :translation
 
   has_many :translations, inverse_of: :problem
-  
+  has_many :authors, -> { where(translations: { status: [:in_use, :outdated] }).distinct }, through: :translations
+
   self.per_page = 50
 
   def is_translated?
@@ -19,6 +20,10 @@ class Problem < ApplicationRecord
     self.translation.in_use!
   end
 
+  def has_anonymous_author?
+    translations.where(status: [:in_use, :outdated], author: nil).any?
+  end
+
   def original_url
     "https://projecteuler.net/problem=#{self.id}"
   end

app/models/translation.rb

@@ -1,5 +1,6 @@
 class Translation < ApplicationRecord
   belongs_to :problem, inverse_of: :translations
+  belongs_to :author, class_name: 'User', inverse_of: :translations, optional: true
   enum status: [:pending, :in_use, :outdated, :declined]
 
   validates :title, :content, :problem_id, presence: true
@@ -7,6 +8,10 @@ class Translation < ApplicationRecord
 
   self.per_page = 50
 
+  def has_author?
+    !!self.author
+  end
+
   def title_is_unique_among_other_problems
     Problem.includes(:translation).where.not(id: problem_id).each do |problem|
       if problem.is_translated? and problem.title == title

app/models/user.rb

@@ -2,6 +2,7 @@ class User < ApplicationRecord
   devise :omniauthable, :rememberable
 
   enum role: [:user, :admin]
+  has_many :translations, inverse_of: :author, dependent: :nullify
 
   def self.from_omniauth(auth)
     where(provider: auth.provider, uid: auth.uid).first_or_create do |user|

app/views/admin/translations/index.html.erb

@@ -7,6 +7,7 @@
   <thead>
     <tr>
       <th><%= Translation.human_attribute_name(:created_at) %></th>
+      <th><%= Translation.human_attribute_name(:author) %></th>
       <th><%= Translation.human_attribute_name(:problem_id) %></th>
       <th><%= Translation.human_attribute_name(:title) %></th>
     </tr>
@@ -16,6 +17,13 @@
     <% @translations.each do |translation| %>
       <tr>
         <td><div data-toggle="tooltip" data-placement="left" title="<%= l translation.created_at %>"><%= time_ago_in_words(translation.created_at) %></div></td>
+        <td>
+          <% if translation.has_author? %>
+            <%= translation.author.name %>
+          <% else %>
+            <i><%= t('.anonymous') %></i>
+          <% end %>
+        </td>
         <td><%= translation.problem_id %></td>
         <td><%= link_to translation.title, [:admin, translation] %></td>
       </tr>

app/views/admin/translations/show.html.erb

@@ -1,6 +1,9 @@
 <% provide(:title, t('problems.show.problem_subtitle', id: @translation.problem_id)) %>
 
 <div class="page-header">
+  <p class="text-muted">
+    <%= render 'shared/authors', authors: Array(@translation.author) %>
+  </p>
   <h1><%= @translation.title %> <small><%= t 'problems.show.problem_subtitle', id: @translation.problem_id %></small></h1>
 </div>
 

app/views/problems/show.html.erb

@@ -1,6 +1,9 @@
 <% provide(:title, t('problems.show.problem_subtitle', id: @problem.id)) %>
 
 <div class="page-header">
+  <p class="text-muted">
+    <%= render 'shared/authors', authors: @problem.authors, has_anonymous_author: @problem.has_anonymous_author? %>
+  </p>
   <h1><%= @problem.title %> <small><%= t '.problem_subtitle', id: @problem.id %></small></h1>
 </div>
 <%= link_to new_problem_translation_path(@problem), class: 'btn btn-default btn-sm pull-right' do %>

app/views/shared/_authors.de.html.erb

@@ -0,0 +1,11 @@
+<% if authors.empty? %>
+  Diese Übersetung wurde anonym erstellt.
+<% else %>
+  Diese Übersetzung wurde von
+  <% if local_assigns[:has_anonymous_author] %>
+    <%= (authors.map(&:name)+Array("anonymen Nutzern")).to_sentence %>
+  <% else %>
+    <%= authors.map(&:name).to_sentence %>
+  <% end %>
+   erstellt.
+<% end %>