Trestle

gem 'trestle'

Trestle.resource(:posts) do
  # Add a link to this admin in the main navigation
  menu do
    group :blog_management, priority: :first do
      item :posts, icon: "fa fa-file-text-o"
    end
  end

  # Define custom scopes for the index view
  scopes do
    scope :all, default: true
    scope :published
    scope :drafts, -> { Post.unpublished }
  end

  # Define the index view table listing
  table do
    column :title, link: true
    column :author, ->(post) { post.author.name }
    column :published, align: :center do |post|
      status_tag(icon("fa fa-check"), :success) if post.published?
    end
    column :updated_at, header: "Last Updated", align: :center
    actions
  end

  # Define the form structure for the new & edit actions
  form do
    # Organize fields into tabs and sidebars
    tab :post do
      text_field :title

      # Define custom form fields for easy re-use
      editor :body
    end

    tab :metadata do
      # Layout fields based on a 12-column grid
      row do
        col(sm: 6) { select :author, User.all }
        col(sm: 6) { tag_select :tags }
      end
    end

    sidebar do
      # Render a custom partial: app/views/admin/posts/_sidebar.html.erb
      render "sidebar"
    end
  end
end