Add Rails admin

Gemfile

@@ -36,6 +36,7 @@ gem 'faraday'
 gem 'proforma', git: 'https://github.com/openHPI/proforma.git', tag: 'v0.5'
 gem 'whenever', require: false
 gem 'rails-timeago'
+gem 'rails_admin', '~> 2.0'
 
 # Error Tracing
 gem 'concurrent-ruby'

Gemfile.lock

@@ -50,6 +50,10 @@ GEM
       globalid (>= 0.3.6)
     activemodel (5.2.4.4)
       activesupport (= 5.2.4.4)
+    activemodel-serializers-xml (1.0.2)
+      activemodel (> 5.x)
+      activesupport (> 5.x)
+      builder (~> 3.1)
     activerecord (5.2.4.4)
       activemodel (= 5.2.4.4)
       activesupport (= 5.2.4.4)
@@ -139,6 +143,9 @@ GEM
     forgery (0.8.1)
     globalid (0.4.2)
       activesupport (>= 4.2.0)
+    haml (5.2.0)
+      temple (>= 0.8.0)
+      tilt
     hashdiff (1.0.1)
     headless (2.3.1)
     highline (2.0.3)
@@ -157,8 +164,26 @@ GEM
       oauth (>= 0.4.5, < 0.6)
     jbuilder (2.10.1)
       activesupport (>= 5.0.0)
+    jquery-rails (4.4.0)
+      rails-dom-testing (>= 1, < 3)
+      railties (>= 4.2.0)
+      thor (>= 0.14, < 2.0)
+    jquery-ui-rails (6.0.1)
+      railties (>= 3.2.16)
     json (2.3.1)
     jwt (2.2.2)
+    kaminari (1.2.1)
+      activesupport (>= 4.1.0)
+      kaminari-actionview (= 1.2.1)
+      kaminari-activerecord (= 1.2.1)
+      kaminari-core (= 1.2.1)
+    kaminari-actionview (1.2.1)
+      actionview
+      kaminari-core (= 1.2.1)
+    kaminari-activerecord (1.2.1)
+      activerecord
+      kaminari-core (= 1.2.1)
+    kaminari-core (1.2.1)
     kramdown (2.3.0)
       rexml
     listen (3.3.1)
@@ -192,6 +217,7 @@ GEM
     multi_json (1.15.0)
     multi_xml (0.6.0)
     multipart-post (2.1.1)
+    nested_form (0.3.2)
     netrc (0.11.0)
     newrelic_rpm (6.14.0)
     nio4r (2.5.4)
@@ -231,6 +257,9 @@ GEM
     rack (2.2.3)
     rack-mini-profiler (2.2.0)
       rack (>= 1.2.0)
+    rack-pjax (1.1.0)
+      nokogiri (~> 1.5)
+      rack (>= 1.1)
     rack-proxy (0.6.5)
       rack
     rack-test (1.1.0)
@@ -263,6 +292,18 @@ GEM
     rails-timeago (2.19.0)
       actionpack (>= 3.1)
       activesupport (>= 3.1)
+    rails_admin (2.0.2)
+      activemodel-serializers-xml (>= 1.0)
+      builder (~> 3.1)
+      haml (>= 4.0, < 6)
+      jquery-rails (>= 3.0, < 5)
+      jquery-ui-rails (>= 5.0, < 7)
+      kaminari (>= 0.14, < 2.0)
+      nested_form (~> 0.3)
+      rack-pjax (>= 0.7)
+      rails (>= 5.0, < 7)
+      remotipart (~> 1.3)
+      sassc-rails (>= 1.3, < 3)
     railties (5.2.4.4)
       actionpack (= 5.2.4.4)
       activesupport (= 5.2.4.4)
@@ -280,6 +321,7 @@ GEM
     rb-inotify (0.10.1)
       ffi (~> 1.0)
     regexp_parser (1.8.2)
+    remotipart (1.4.4)
     rest-client (2.1.0)
       http-accept (>= 1.7.0, < 2.0)
       http-cookie (>= 1.0.2, < 2.0)
@@ -460,6 +502,7 @@ DEPENDENCIES
   rails-controller-testing
   rails-i18n
   rails-timeago
+  rails_admin (~> 2.0)
   ransack
   rest-client
   rspec-autotest

app/policies/application_policy.rb

@@ -76,4 +76,7 @@ class ApplicationPolicy
     end
     private :require_user!
   end
+  [:dashboard?, :index?, :new?, :export?, :bulk_delete?, :show?, :edit?, :delete?, :show_in_app?,].each do |action|
+    define_method(action) { admin? }
+  end
 end

app/views/application/_navigation.html.slim

@@ -7,6 +7,7 @@
       ul.dropdown-menu.p-0.mt-1 role='menu'
         - if current_user.admin?
           li = link_to(t('breadcrumbs.dashboard.show'), admin_dashboard_path, class: 'dropdown-item', 'data-turbolinks' => "false") if policy([:admin, :dashboard]).show?
+          li = link_to(t('breadcrumbs.rails_admin.show'), rails_admin.dashboard_path, class: 'dropdown-item', 'data-turbolinks' => "false") if policy([:admin, :dashboard]).show?
           li = link_to(t('breadcrumbs.statistics.show'), statistics_path, class: 'dropdown-item') if policy(:statistics).show?
           li.dropdown-divider role='separator'
         = render('navigation_submenu', title: t('activerecord.models.exercise.other'),

config/initializers/rails_admin.rb

@@ -0,0 +1,66 @@
+RailsAdmin.config do |config|
+
+  ### Popular gems integration
+
+  ## == Devise ==
+  # config.authenticate_with do
+  #   warden.authenticate! scope: :user
+  # end
+  # config.current_user_method(&:current_user)
+
+  ## == CancanCan ==
+  # config.authorize_with :cancancan
+
+  ## == Pundit ==
+  # config.authorize_with :pundit
+  config.authorize_with do
+    redirect_to main_app.root_path unless current_user.admin?
+    # unless current_user.admin?
+    #   flash[:alert] = 'Access denied.'
+    #   redirect_to main_app.root_path
+    # end
+  end
+
+  ## == PaperTrail ==
+  # config.audit_with :paper_trail, 'User', 'PaperTrail::Version' # PaperTrail >= 3.0.0
+
+  ### More at https://github.com/sferik/rails_admin/wiki/Base-configuration
+
+  ## == Gravatar integration ==
+  ## To disable Gravatar integration in Navigation Bar set to false
+  # config.show_gravatar = true
+
+  config.actions do
+    dashboard                     # mandatory
+    index                         # mandatory
+    new
+    export
+    bulk_delete
+    show
+    edit
+    delete
+    show_in_app
+
+    ## With an audit adapter, you can add:
+    # history_index
+    # history_show
+  end
+
+  # stolen from https://github.com/kaminari/kaminari/issues/162#issuecomment-52083985
+  if defined?(WillPaginate)
+    module WillPaginate
+      module ActiveRecord
+        module RelationMethods
+          def per(value = nil) per_page(value) end
+          def total_count() count end
+          def first_page?() self == first end
+          def last_page?() self == last end
+        end
+      end
+      module CollectionMethods
+        alias_method :num_pages, :total_pages
+      end
+    end
+  end
+end
+

config/locales/en.yml

@@ -261,6 +261,8 @@ en:
       graphs: "Graphs"
       user_activity_history: User Activity History
       rfc_activity_history: RfC Activity History
+    rails_admin:
+      show: "Rails admin"
   consumers:
     show:
       link: Consumer

config/routes.rb

@@ -1,6 +1,7 @@
 FILENAME_REGEXP = /[\w\.]+/ unless Kernel.const_defined?(:FILENAME_REGEXP)
 
 Rails.application.routes.draw do
+  mount RailsAdmin::Engine => '/rails_admin', as: 'rails_admin'
   resources :error_template_attributes
   resources :error_templates do
     member do