Redmine

Hello Community!
I just started with plugin development in Redmine (written in Ruby on Rails) and have a question concerning the development:

- I use as development server webrick (script/server webrick -e development) in order to see the changes which I make in the view.

- If I make a change in the controller of my plugin (I use a already written one and want to modify it to my needs), the changes do not appear in the page. For example: I do there a "create" method of another ActiveRecord object but the page behaves like I did not do any change. Now I have read the in redmine you cannot overwrite the controller or the model. Does this also count for the plugins in Redmine? How can I do overwrite a controller in a plugin. Do I have there to use the module approach?

I am looking forward your answers.

Best regards,

christianredmine