But this does not change anythings, using
/categories/7/products always leads to the index action of the
products controller.
Is the right way to test in the index action of the products
controller whether category_id is set in params and use this
information to only show products of this category? Or is there a
better way?
It sounds like your routes are set up alright, but yeah, you'll still
need to add code so your action knows how to handle it.
In your ProductsController#index action, you probably have something
like this?
@products = Product.all
Since you have category_id in the params, something like this should
work:
if params[:category_id]
@category = Category.find(params[:category_id])
@products = @category.products
end
Personally, if I have a controller that's always used as a nested
resource, I put the initialization of the parent into a before_filter,
so it's called for every action.
I am not sure if this answers your question or not, and you may know
this already, but if you have found the product with id 7 and it is in
variable @product say, then the categories for that product are
available as an array in @product.categories.
Apologies if this is nothing to do with what you want to achieve.
If you have a line in ProductsController#index like:
@products = Product.find(:all)
Then of course you'll see all products. The question is what you want to see at that url. I'd expect to see all the products in category 7
def index
if find_category
@products = @category.products
else
flash[:error] = "No category with id=#{params[:category_id]}"
redirect_to categories_path
end
end
def find_category
@category = Category.find_by_id(params[:category_id])
end
And you can even put the find_category into a before_filter and redirect from it directly.
