Add table_name_prefix to Engine's namespace automatically

2 files changed, 14 insertions, 1 deletions

diff --git a/railties/lib/rails/engine.rb b/railties/lib/rails/engine.rb
index 13629e0de3..663feb4e32 100644
--- a/railties/lib/rails/engine.rb
+++ b/railties/lib/rails/engine.rb
@@ -201,11 +201,19 @@ module Rails
       end
 
       def namespace(mod)
+        # TODO: extract that into a module
+        engine_name(generate_railtie_name(mod))
+
         _railtie = self
+        name = engine_name
         mod.singleton_class.instance_eval do
           define_method(:_railtie) do
             _railtie
           end
+
+          define_method(:table_name_prefix) do
+            "#{name}_"
+          end
         end
       end
     end
diff --git a/railties/lib/rails/railtie.rb b/railties/lib/rails/railtie.rb
index ab565b0cdc..09650789ac 100644
--- a/railties/lib/rails/railtie.rb
+++ b/railties/lib/rails/railtie.rb
@@ -167,8 +167,13 @@ module Rails
 
       def railtie_name(name = nil)
         @railtie_name = name.to_s if name
-        @railtie_name ||= ActiveSupport::Inflector.underscore(self.name).gsub("/", "_")
+        @railtie_name ||= generate_railtie_name(self.name)
       end
+
+      protected
+        def generate_railtie_name(class_or_module)
+          ActiveSupport::Inflector.underscore(class_or_module).gsub("/", "_")
+        end
     end
 
     delegate :railtie_name, :to => "self.class"