1 files changed, 36 insertions, 0 deletions
diff --git a/actionpack/lib/action_controller/metal/implicit_render.rb b/actionpack/lib/action_controller/metal/implicit_render.rb
new file mode 100644
index 0000000000..17fcc2fa02
--- /dev/null
+++ b/actionpack/lib/action_controller/metal/implicit_render.rb
@@ -0,0 +1,36 @@
+module ActionController
+  module ImplicitRender
+
+    include BasicImplicitRender
+
+    # Renders the template corresponding to the controller action, if it exists.
+    # The action name, format, and variant are all taken into account.
+    # For example, the "new" action with an HTML format and variant "phone" 
+    # would try to render the <tt>new.html+phone.erb</tt> template.
+    #
+    # If no template is found <tt>ActionController::BasicImplicitRender</tt>'s implementation is called, unless
+    # a block is passed. In that case, it will override the super implementation.
+    #
+    #   default_render do
+    #     head 404 # No template was found
+    #   end
+    def default_render(*args)
+      if template_exists?(action_name.to_s, _prefixes, variants: request.variant)
+        render(*args)
+      else
+        if block_given?
+          yield(*args)
+        else
+          logger.info "No template found for #{self.class.name}\##{action_name}, rendering head :no_content" if logger
+          super
+        end
+      end
+    end
+
+    def method_for_action(action_name)
+      super || if template_exists?(action_name.to_s, _prefixes)
+        "default_render"
+      end
+    end
+  end
+end