具有嵌套资源的collection_select

Question

So, my first question on Stackoverflow! Lets see how it goes...

So I've got a collection_select who represents the current category you are on:

<%= collection_select(:category, :slug, current_user.categories, :slug, :name) %>

This select represents which category the user currently is on, and the user should be able to switch between the categories.

The categories have post like so:

resources :categories do
  resources :posts
end

I want the collection_select to automatically select the current category based on url parameters, which works so far:

http://myproject.com/categories/action

The selected value is the same as the current url parameter. But it does not work when the user navigates to a post :

http://myproject.com/categories/action/my-new-post

This resets the collection_select , I figured it has something to do with nestled resources, what should i do?

Just to clarify: i have a very simple javascript to reload the page when user selects a category.

Answer 1

It sounds like you want to set an initial value for your collection select. Something like:

<%= collection_select(:category, :slug, current_user.categories, :slug, :name {:selected => params[YOUR_PARAM_NAME_HERE]}) %>

Alternatively, if you can do something like this

<%= collection_select(:category, :slug, current_user.categories, :slug, :name {:selected => @category.slug} %>

Is that about right?