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?