Active admin cheat-sheet in Rails

Active Admin cheatsheet in Rails

Hello rails newbies. Almost every application, be it a Rails application or other technology application, it requires an admin application from where admin can View/Create/Delete/Update the different resources available in the applications.

Rails provides different Gems for the admin application like - Active admin and Rails admin.

These are the application which require a setting at the minimum level and provides the functionalities at the maximum of it. Active admin is best to provide the admin functionalities in Rails applications.

My personal suggestion to master active admin is just don’t go with its official documentation in the very first place. Just go to its site and configure the a application and then you will get an the idea by yourself everything.
Then you will start to understand the active admin documentation by yourself.

In my application, I first configured it then started to understand it.
  1. For every model CRUD functionality is provided very easily and effectively.
  2. Different rails gems can be easily configured in active admin.
  3. And the most important one, There is nothing that cannot be done in Active admin.
  • Add gem in Gemfile.
  gem 'activeadmin', github: 'activeadmin'
  • Run installer command for generating active admin configuration file in config/initializers.
  rails generate active_admin:install
  • Create a resource for a model in active admin folder
  rails generate active_admin:resource model_name

For every resource a page will be created in admin folder in app folder of the application.

Now you just need to apply different settings and it starts behaving according to your requirements.

  • Menu
  menu priority: 2
  • Permitted params
  permit_params :name, :parent_id, :best_seller, :latest
  • Pagination size
  config.per_page = 10
  • Scopes
  scope :root_categories
  • Filters
  filter :name
  • Override Form (New/Edit)
form do |f|
  f.inputs 'Categories and sub categories form' do    
    f.input :parent_id, :label => 'Root category', as: :select2,
            collection: Category.root_categories.collect { |category| [,] }
    f.input :name
    if f.object.sub_category?
      f.input :latest, as: :boolean      
      f.input :best_seller, as: :boolean    
  • Override Index page
index do  selectable_column
  column :name do |category|
    if category.sub_category?
      label, class: 'sub_category_label'    
      label, class: 'root_category_label'    
  column :root_category  
  column :total_items, sortable: true do |category|
    if category.sub_category?
      label category.items.count
      label category.sub_categories.collect { |x| x.items.count }.inject(&:+)
  column :created_at do |category|
    time_ago_in_words(category.created_at) + ' ago'  
  column :updated_at do |category|
    time_ago_in_words(category.updated_at) + ' ago'  
  • For converting all the drop downs of the application into select2 drop downs add gem.
  gem 'activeadmin-select2', github: 'mfairburn/activeadmin-select2'
  • For changing theme of the application add gem.
  gem 'active_admin_theme'
  • For adding Import functionality add gem.
  gem "active_admin_import" , '3.0.0'
  • For editing values in the index page add gem.
  gem 'best_in_place', github: 'bernat/best_in_place'


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