e3matheus · January 14, 2015 23:27 · Jan 14, 2015 · Jan 14, 2015
diff --git a/nested_attributes_hack → nested_attributes_hack.rb b/nested_attributes_hack → nested_attributes_hack.rb
diff --git a/nested_attributes_hack b/nested_attributes_hack
@@ -0,0 +1,33 @@
+module Addons
+  module HashNestedAttributes
+    extend ActiveSupport::Concern
+
+    # My own nested attributes to create a cleaner interface
+    # when sending nested attributes from a javascript app
+    module ClassMethods
+      def accepts_hash_nested_attributes_for relation_name, options = {}
+        relation_class = relation_name.to_s.classify.safe_constantize
+
+        define_method "#{relation_name}_hash=" do |records|
+          relation_collector = self.send(relation_name).to_a
+
+          new_ids = records.map {|rec| rec[:id].to_i }
+          old_ids = relation_collector.map(&:id)
+          relation_class.where(:id => old_ids - new_ids).delete_all
+
+          records.map do |rec|
+            rec    = rec.symbolize_keys
+            record = self.send(relation_name).detect { |m| m.id == rec[:id].to_i }
+            if record
+              record.update_attributes(rec)
+            else
+              if !options[:reject_if] || (options[:reject_if].present? && !options[:reject_if].call(rec))
+                self.send(relation_name).build(rec)
+              end
+            end
+          end
+        end
+      end
+    end
+  end                                                                                                                                                                            
+end