Menu displayed on all pages, code is replicated in all controllers

I have a collection model. I succesfully created a _collection.html.erb that i call with <%= render @collections%> in my application layout.

My problem is that in ALL my controlers method I must add @collections = Collection.all

I found it very very ugly,it will make my collection scope a pain to change开发者_如何学JAVA, and I'm sure that I am missing a rails magic something that would be way nicer.

Is there a way to have a part of the layout generated by model data without having a identical piece of code in AAAALLLLLL the controllers?

Notice that your controllers all inherit from ApplicationController. Use this to your advantage. Add a before_filter to ApplicationController that loads your collections.

@cam was right. Any rails project has an ApplicationController. Your controllers all start with MyController < ApplicationController, right? If so, that means you can create a before_filter in your ApplicationController, which will be inherited by all your controllers. To do so :

/app/controllers/application_controller.rb

before_filter :load_collection

def load_collection
    @collections = Collection.all
end

From now on, you can use @collections from all your controllers (as long as they inherited from ApplicationController)