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Deep integration of CanCan into ActiveAdmin
# blog post:
module ActiveAdmin
module ViewHelpers
# lib/active_admin/view_helpers/auto_link_helper.rb
def auto_link(resource, link_content = nil)
content = link_content || display_name(resource)
if can?(:read, resource) && registration = active_admin_resource_for(resource.class)
begin
content = link_to(content, send(registration.route_instance_path, resource))
rescue
end
end
content
end
end
module Views
class IndexAsTable
class IndexTableFor
# lib/active_admin/views/index_as_table.rb
def default_actions(options = {})
options = {
:name => ""
}.merge(options)
column options[:name] do |resource|
links = ''.html_safe
if controller.action_methods.include?('show') && can?(:read, resource)
links += link_to I18n.t('active_admin.view'), resource_path(resource), :class => "member_link view_link"
end
if controller.action_methods.include?('edit') && can?(:update, resource)
links += link_to I18n.t('active_admin.edit'), edit_resource_path(resource), :class => "member_link edit_link"
end
if controller.action_methods.include?('destroy') && can?(:destroy, resource)
links += link_to I18n.t('active_admin.delete'), resource_path(resource), :method => :delete, :data => {:confirm => I18n.t('active_admin.delete_confirmation')}, :class => "member_link delete_link"
end
links
end
end
end
end
end
class Resource
# lib/active_admin/resource/menu.rb
# The :if block is evaluated by TabbedNavigation#display_item?
def default_menu_options
klass = resource_class # avoid variable capture
super.merge(:if => proc{ can? :read, klass })
end
# lib/active_admin/resource/action_items.rb
def add_default_action_items
# New Link on all actions except :new and :show
add_action_item :except => [:new, :show], :if => proc{ can? :create, active_admin_config.resource_class } do
if controller.action_methods.include?('new')
link_to(I18n.t('active_admin.new_model', :model => active_admin_config.resource_label), new_resource_path)
end
end
# Edit link on show
add_action_item :only => :show, :if => proc{ can? :update, resource } do
if controller.action_methods.include?('edit')
link_to(I18n.t('active_admin.edit_model', :model => active_admin_config.resource_label), edit_resource_path(resource))
end
end
# Destroy link on show
add_action_item :only => :show, :if => proc{ can? :destroy, resource } do
if controller.action_methods.include?("destroy")
link_to(I18n.t('active_admin.delete_model', :model => active_admin_config.resource_label),
resource_path(resource),
:method => :delete, :data => {:confirm => I18n.t('active_admin.delete_confirmation')})
end
end
end
end
class ResourceController
# lib/active_admin/resource_controller/collection.rb
# The following doesn't work (see https://github.com/ryanb/cancan/pull/683):
#
# load_and_authorize_resource
# skip_load_resource :only => :index
#
# If you don't skip loading on #index you will get the exception:
#
# "Collection is not a paginated scope. Set collection.page(params[:page]).per(10) before calling :paginated_collection."
load_resource :except => :index
authorize_resource
# https://github.com/gregbell/active_admin/wiki/Enforce-CanCan-constraints
# https://github.com/ryanb/cancan/blob/master/lib/cancan/controller_resource.rb#L80
def scoped_collection
end_of_association_chain.accessible_by(current_ability)
end
end
end
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