Introduction:

Rails Admin is a Gem that creates an interface for you to manage your data. For further explanation take a look at the Gem’s page on GitHub!

Start by:

On your gemfile: gem 'rails_admin'
Run bundle install
Restart your Rails server.
Run rails generate rails_admin:install
Create an admin user with rails g devise Admin
Create a namespace under your routes:
1. https://guides.rubyonrails.org/routing.html#controller-namespaces-and-routing for how to do that!
2. We will instead follow the rails admin installation guide by adding this line to routes.rb below devise_for :admin
```
mount RailsAdmin::Engine => '/admin', as: 'rails_admin'
```

Authenticate the admin view by uncommenting and replace user with admin in config/initializers/rails_admin.rb

config.authenticate_with do
  warden.authenticate! scope: :admin
end
config.current_user_method(&:current_admin)

http://localhost:3000/admin Check out your tables!
It's really complete! You can create data, update data, and delete data in all of your tables

Actions:

Let's limit the access to certain models using admin!

In rails_admin.rb

config.actions do
  edit do
    only ['post', 'user']
  end
  delete do
    except ['like']
  end
end

Re run your admin see what changed!
Put something like this this in your model class (be sure to rename things appropriately):

class Post < ActiveRecord::Base
  belongs_to :user
  has_many :likes
  has_many :users_liked, through: :likes, source: :user

  validates :caption, presence: true

  rails_admin do
    configure :user do
      label 'Owner of this post: '
    end
  end
end

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