Calculate amount of users per role by max access

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/controllers/admin/dashboard_controller.rb

@@ -4,5 +4,9 @@ class Admin::DashboardController < Admin::ApplicationController
     @users = User.order_id_desc.limit(10)
     @groups = Group.order_id_desc.with_route.limit(10)
     @license = License.current
+
+    # EE only
+    @admin_count = User.admins.count
+    @roles_count = ProjectAuthorization.roles_stats
   end
 end

app/models/project_authorization.rb

@@ -24,4 +24,21 @@ class ProjectAuthorization < ActiveRecord::Base
       EOF
     end
   end
+
+  def self.roles_stats
+    connection.execute <<-EOF.strip_heredoc
+      SELECT CASE max(access_level)
+      WHEN 10 THEN 'guest'
+      WHEN 20 THEN 'reporter'
+      WHEN 30 THEN 'developer'
+      WHEN 40 THEN 'master'
+      WHEN 50 THEN 'owner'
+      ELSE 'unknown' END
+      AS kind,
+        count(DISTINCT user_id) AS amount
+      FROM #{table_name}
+      GROUP BY access_level
+      ORDER BY amount DESC;
+    EOF
+  end
 end

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

@@ -4,6 +4,7 @@
 %div{ class: container_class }
   - if @license
     = render "admin/licenses/breakdown", license: @license
+    = render "admin/dashboard/roles_stats"
 
   .admin-dashboard.prepend-top-default
     .row

ee/app/views/admin/dashboard/_roles_stats.html.haml

+%div
+  %p Admin users: #{@admin_count}
+
+  - @roles_count.each do |row|
+    %p
+      Users with max #{row['kind']} access level:
+      %strong
+        = row['amount']