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 %>