move custom fields into its own concern

spec/components/concern/has_custom_fields_spec.rb

@@ -0,0 +1,79 @@
+require "spec_helper"
+require_dependency "concern/has_custom_fields"
+
+describe Concern::HasCustomFields do
+
+  context "custom_fields" do
+    before do
+
+      Topic.exec_sql("create temporary table test_items(id SERIAL primary key)")
+      Topic.exec_sql("create temporary table test_item_custom_fields(id SERIAL primary key, test_item_id int, name varchar(256) not null, value text)")
+
+      class TestItem < ActiveRecord::Base
+        include Concern::HasCustomFields
+      end
+
+      class TestItemCustomField < ActiveRecord::Base
+        belongs_to :test_item
+      end
+    end
+
+    after do
+      Topic.exec_sql("drop table test_items")
+      Topic.exec_sql("drop table test_item_custom_fields")
+
+      # import is making my life hard, we need to nuke this out of orbit
+      des = ActiveSupport::DescendantsTracker.class_variable_get :@@direct_descendants
+      des[ActiveRecord::Base].delete(TestItem)
+      des[ActiveRecord::Base].delete(TestItemCustomField)
+    end
+
+    it "simple modification of custom fields" do
+      test_item = TestItem.new
+
+      test_item.custom_fields["a"].should == nil
+
+      test_item.custom_fields["bob"] = "marley"
+      test_item.custom_fields["jack"] = "black"
+      test_item.save
+
+      test_item = TestItem.find(test_item.id)
+
+      test_item.custom_fields["bob"].should == "marley"
+      test_item.custom_fields["jack"].should == "black"
+
+      test_item.custom_fields.delete("bob")
+      test_item.custom_fields["jack"] = "jill"
+
+      test_item.save
+      test_item = TestItem.find(test_item.id)
+
+      test_item.custom_fields.should == {"jack" => "jill"}
+    end
+
+
+    it "simple modifications don't interfere" do
+      test_item = TestItem.new
+
+      test_item.custom_fields["a"].should == nil
+
+      test_item.custom_fields["bob"] = "marley"
+      test_item.custom_fields["jack"] = "black"
+      test_item.save
+
+      test_item2 = TestItem.new
+
+      test_item2.custom_fields["x"].should == nil
+
+      test_item2.custom_fields["sixto"] = "rodriguez"
+      test_item2.custom_fields["de"] = "la playa"
+      test_item2.save
+
+      test_item = TestItem.find(test_item.id)
+      test_item2 = TestItem.find(test_item2.id)
+
+      test_item.custom_fields.should == {"jack" => "black", "bob" => "marley"}
+      test_item2.custom_fields.should == {"sixto" => "rodriguez", "de" => "la playa"}
+    end
+  end
+end