breadcrumb for embedded documents

[raphox]

I create a class to override the default helper.

Use case:

# Models
class Company
 include Mongoid::Document

 embeds_many :catalogs, { class_name: 'Company::Catalog' }
end

class Company::Catalog
 include Mongoid::Document

 embedded_in :company

 breadcrumb do
 mongoid_breadcrumb_links
 end
end

# ActiveAdmin
ActiveAdmin.register Company do
end

ActiveAdmin.register Company::Catalog, as: 'Catalog' do
 belongs_to :company
end

module ActiveAdmin::ViewHelpers::BreadcrumbHelper
 # Returns an array of links to use in a breadcrumb
 def mongoid_breadcrumb_links(path = request.path)
 # remove leading "/" and split up the URL
 # and remove last since it's used as the page title
 parts = path.split('/').select(&:present?)[0..-2]

 resources = []

 parts.each_with_index.map do |part, index|
 # 1. try using `display_name` if we can locate a DB object
 # 2. try using the model name translation
 # 3. default to calling `titlecase` on the URL fragment
 if part =~ /\A(\d+|[a-f0-9]{24}|(?:[a-f0-9]{8}-(?:[a-f0-9]{4}-){3}[a-f0-9]{12}))\z/ && parts[index - 1]
 parent = active_admin_config.belongs_to_config.try :target
 config = parent && parent.resource_name.route_key == parts[index - 1] ? parent : active_admin_config
 parent_resource = resources.last
##
# main difference from https://github.com/activeadmin/activeadmin/blob/646bf004782e4eae912ff8821f36db691f49fcfb/lib/active_admin/view_helpers/breadcrumb_helper.rb
 resources << if parent_resource
 collection = parent_resource.send(config.resource_name.collection)
 collection.find part
 else
 config.find_resource part
 end
##
 name = display_name resources.last
 end

 name ||= I18n.t "activerecord.models.#{part.singularize}",
 { count: ::ActiveAdmin::Helpers::I18n::PLURAL_MANY_COUNT, default: part.titlecase }

 # Don't create a link if the resource's show action is disabled
 if !config || config.defined_actions.include?(:show)
 link_to name, '/' + parts[0..index].join('/')
 else
 name
 end
 end
 end
end

TIP: Disable company filter in ActiveAdmin.register Company::Catalog because Formtastic doen't work very well with embedded reference.

[grzegorz-jakubiak]

@raphox thanks a lot, would you be willing to submit a pull request?