refactor: make Ransack distinct optional

README.md

@@ -117,7 +117,7 @@ end
 
 ## Customizations
 
-- Ransack options can be customized defining a `ransack_options` method in the controller, example:
+- Ransack options can be set adding specific methods (`ransack_options` / `ransack_result_distinct`) to a resource controller, example:
 
 ```rb
 module Admin
@@ -128,6 +128,12 @@ module Admin
       # raises an exception on unknown parameters
       { ignore_unknown_conditions: false }
     end
+
+    # by default distinct is applied on the search results
+    def ransack_result_distinct
+      # disable distinct
+      false
+    end
   end
 end
 ```

lib/administrate_ransack/searchable.rb

@@ -6,8 +6,9 @@ module AdministrateRansack
   module Searchable
     def scoped_resource
       options = respond_to?(:ransack_options) ? ransack_options : {}
+      distinct = respond_to?(:ransack_result_distinct) ? ransack_result_distinct : true
       @ransack_results = super.ransack(params[:q], **options)
-      @ransack_results.result(distinct: true)
+      @ransack_results.result(distinct: distinct)
     end
 
     # ref => https://github.com/thoughtbot/administrate/blob/v0.18.0/app/helpers/administrate/application_helper.rb#L72-L78

spec/dummy/app/controllers/admin/posts_controller.rb

@@ -6,6 +6,10 @@ def ransack_options
       { ignore_unknown_conditions: false }
     end
 
+    def ransack_result_distinct
+      false
+    end
+
     # Overwrite any of the RESTful controller actions to implement custom behavior
     # For example, you may want to send an email after a foo is updated.
     #