Use ransack_mongo

activeadmin-mongoid.gemspec

@@ -22,7 +22,7 @@ Gem::Specification.new do |gem|
   gem.add_runtime_dependency 'activeadmin', ['>= 1.0.0.pre', '< 2']
   gem.add_runtime_dependency 'jquery-rails'
   gem.add_runtime_dependency 'sass-rails',  ['>= 3.1.4', '< 5.0']
-  # gem.add_runtime_dependency 'meta_search',  '~> 1.1.3'
+  gem.add_runtime_dependency 'ransack_mongo',  '~> 1.0.0'
 
   gem.add_development_dependency 'rspec-rails',  '~> 2.7'
 end

lib/active_admin/filters/formtastic_addons.rb

@@ -0,0 +1,23 @@
+module ActiveAdmin
+  module Filters
+    module FormtasticAddons
+
+      def searchable_has_many_through?
+        false
+      end
+
+      def has_predicate?
+        !!RansackMongo::Predicate.new(RansackMongo::MongoAdapter::PREDICATES).detect_from_string(method.to_s)
+      end
+
+      def ransacker?
+        false
+      end
+
+      def scope?
+        false
+      end
+
+    end
+  end
+end

lib/active_admin/mongoid.rb

@@ -14,6 +14,8 @@
 require 'active_admin/mongoid/document'
 require 'active_admin/mongoid/helpers/collection'
 require 'active_admin/mongoid/criteria'
+require 'active_admin/filters/formtastic_addons'
+require 'active_admin/resource_controller/data_access'
 
 require 'active_admin/mongoid/order_clause'
 

lib/active_admin/resource_controller/data_access.rb

@@ -0,0 +1,13 @@
+module ActiveAdmin
+  class ResourceController < BaseController
+
+    module DataAccess
+
+      # Applies any Ransack search methods to the currently scoped collection.
+      # Both `search` and `ransack` are provided, but we use `ransack` to prevent conflicts.
+      def apply_filtering(chain)
+        @search = chain.where RansackMongo::Query.parse clean_search_params params[:q]
+      end
+    end
+  end
+end