Add problem count changing to the admin dashboard

app/controllers/admin/dashboard_controller.rb

@@ -1,4 +1,16 @@
 class Admin::DashboardController < AdminController
   def index
+    @current_problem_count = Problem.count
+  end
+
+  def update_problem_count
+    begin
+      new_problem_count = params[:problem_count].to_i
+      raise t('no_problem_count') unless new_problem_count
+      Problem.update_count(new_problem_count)
+      redirect_to({:controller => 'admin/dashboard', :action => :index}, notice: t('.success_message'))
+    rescue => e
+      redirect_to({:controller => 'admin/dashboard', :action => :index}, alert: t('.failure_message', error: e.message))
+    end
   end
 end

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

@@ -1,2 +1,8 @@
 <h1><%= t('.administration') %></h1>
-<%= link_to t('.view_translations'), admin_translations_path %>
+<%= link_to t('.view_translations'), admin_translations_path, class: 'btn btn-default' %>
+
+<h1><%= t('.update_problem_count') %></h1>
+<%= form_tag '/admin/update_problem_count', method: :post, class: 'form-inline' do %>
+    <%= number_field_tag 'problem_count', @current_problem_count, min: @current_problem_count, class: 'form-control' %>
+    <%= submit_tag t('.update'), class: 'btn btn-warning' %>
+<% end %>

config/locales/views/admin/de.yml

@@ -3,4 +3,10 @@ de:
     dashboard:
       index:
         administration: "Administration"
-        view_translations: "Übersetzungen anschauen"
+        view_translations: "Übersetzungen anschauen"
+        update_problem_count: "Problem-Anzahl aktualisieren"
+        update: "Aktualisieren"
+      update_problem_count:
+        success_message: "Problem-Anzahl wurde erfolgreich aktualisiert!"
+        failure_message: "Problem-Anzahl konnte nicht aktualisiert werden! Grund: %{error}"
+        no_problem_count: "Keine Problem-Anzahl gegeben!"

config/routes.rb

@@ -6,6 +6,7 @@ Rails.application.routes.draw do
 
   namespace :admin do
     get '', to: 'dashboard#index', as: '/'
+    post '/update_problem_count', to: 'dashboard#update_problem_count'
     resources :translations, only: [:index, :show]
   end
 

test/controllers/admin/dashboard_controller_test.rb

@@ -12,4 +12,10 @@ class Admin::DashboardControllerTest < ActionController::TestCase
     assert_response :success
   end
 
+  test "should post new problem count" do
+    post :update_problem_count, problem_count: 15
+    assert_redirected_to controller: 'admin/dashboard', action: 'index'
+    assert_equal 15, Problem.count
+  end
+
 end