Add ability for extension/form generators to append to existing seeds…

….rb file instead of overwriting it. #1532.

core/lib/generators/refinery/engine/engine_generator.rb

@@ -20,6 +20,8 @@ def generate
 
       merge_locales!
 
+      copy_or_merge_seeds!
+
       append_extension_to_gemfile!
 
       finalize_extension!

core/lib/generators/refinery/form/form_generator.rb

@@ -22,6 +22,8 @@ def generate
 
       merge_locales!
 
+      copy_or_merge_seeds!
+
       append_extension_to_gemfile!
 
       finalize_extension!

core/lib/refinery/extension_generation.rb

@@ -139,6 +139,7 @@ def evaluate_templates!
             reject_template?(f)
           }.sort.each do |path|
             if (template_path = extension_path_for(path, extension_name)).present?
+              next if path.to_s =~ /seeds.rb/
               template path, template_path
             end
           end
@@ -209,6 +210,27 @@ def merge_locales!
           end
         end
 
+        def copy_or_merge_seeds!
+          source_seed_file      = source_pathname.join("db/seeds.rb")
+          destination_seed_file = destination_pathname.join(extension_path_for(source_seed_file, extension_name))
+
+          if existing_extension?
+            # create temp seeds file
+            temp_seed_file = destination_pathname.join(extension_path_for("tmp/seeds.rb", extension_name))
+
+            # copy/evaluate seeds template to temp file
+            template source_seed_file, temp_seed_file, :verbose => false
+
+            # append temp seeds file content to extension seeds file
+            destination_seed_file.open('a+') { |file| file.puts temp_seed_file.read.to_s }
+
+            # remove temp file
+            FileUtils.rm_rf temp_seed_file
+          else
+            template source_seed_file, destination_seed_file
+          end
+        end
+
         def puts_instructions!
           unless Rails.env.test?
             puts "------------------------"