ActiveResource with RailsAdmin or ActiveAdmin

Question

Has anybody figured out how to use ActiveResource with RailsAdmin or ActiveAdmin or with other similar engine.

It looks like both projects doesn't have this feature yet (https://github.com/activeadmin/activeadmin/issues/26, https://github.com/sferik/rails_admin/issues/1355). On other hand, it's reasonably common case, when you have data residing in other service/app (vs in DB) and I wonder whether somebody hacked it together.

I tried to create ActiveRecord wrapper around ActiveResource resource. However, it's beyond my knowledge of ActiveRecord (and Ruby probably).

Answer 1

Example with AA (tested with commit 802dc451f3b3bd84e736b512d554867c0f2ae011)

ActiveAdmin.register Payment do

  actions :index
  config.batch_actions = false
  filter :created_at_gteq, as: :date_time_picker

  controller do  

    def find_collection
      @search = OpenStruct.new(params[:q] || {})
      result = Payment.find(:all, params: {
                order: params.fetch(:order, 'created_at_desc'),
                page: params.fetch(:page, 1),
                per_page: params.fetch(:per_page, 50),
                q: params[:q] || {}
              })
      #this uses https://github.com/Fivell/activeresource-response,
      # but can be replaced with other  ActiveResource pagination implementation
      limit = result.http_response['X-Limit-Value'].to_i
      offset = result.http_response['X-Offset-Value'].to_i
      total = result.http_response['X-Total-Count'].to_i
      Kaminari.paginate_array(result, limit: limit, offset: offset, total_count: total)
    end
  end    
end

Model

class Payment <  MyActiveResource

  schema do
    attribute 'customer_id', :integer
    attribute 'amount', :integer
    attribute 'created_at', :string
    attribute 'success', :boolean
  end

  def self.column_names
    content_columns
  end

  def self.content_columns
    if @content_columns.nil?
      @content_columns = Array.new
      known_attributes.each do |name|
        @content_columns << ResourceColumn.new(name)
      end
    end
    @content_columns
  end

  def self.columns
    content_columns
  end

  class ResourceColumn
    attr_reader :name

    def initialize(name)
      @name = name
    end

    def type
      :string
    end
  end

end

Patches

module ActiveAdmin
  module Filters
    module FormtasticAddons
      alias :old_seems_searchable? :seems_searchable?
      def seems_searchable?
        return false if ransacker?
        old_seems_searchable?
      end

      def klass
        @object.try(:object).try(:klass)
      end

      def ransacker?
        klass.try(:_ransackers).try(:key?, method.to_s)
      end

      def scope?
        context = Ransack::Context.for klass rescue nil
        context.respond_to?(:ransackable_scope?) && context.ransackable_scope?(method.to_s, klass)
      end
    end
  end
end

module ActiveAdmin
  module Helpers
    module Collection

      def collection_size(c = collection)
        if c.is_a? ActiveRecord::Relation
          c = c.except :select, :order
          c.group_values.present? ? c.count.count : c.count
        else
          c.respond_to?(:count) ? c.count : 0
        end
      end

    end
  end
end