User friendly parent/child routes for categories - ruby-on-rails

Question

I want to have URL like www.mydomain.com/category/parent/child so my routes are get '/category/:name(/:name)' => 'categories#show'
I got a table 'categories' like
> desc categories;
+------------+--------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+------------+--------------+------+-----+---------+----------------+
| id | int(11) | NO | PRI | NULL | auto_increment |
| public_id | int(11) | YES | | NULL | |
| name | varchar(255) | YES | | NULL | |
| root | int(11) | YES | | NULL | |
| created_at | datetime | NO | | NULL | |
| updated_at | datetime | NO | | NULL | |
+------------+--------------+------+-----+---------+----------------+
I populate the database like this
Category.create(:public_id => 60, :name => "nues", :root => 0)
Category.create(:public_id => 61, :name => "artistiques", :root => 60)
Category.create(:public_id => 62, :name => "glamours", :root => 60)
Category.create(:public_id => 63, :name => "fetichiste", :root => 60)
Category.create(:public_id => 69, :name => "autres", :root => 60)
So if root = 0 so it's a parent category. If root > 0the category is a child from the root value
My Categorie_Controller show action. The problem is that categories got the same name like 'Nature -> Others' and 'Portrait -> Others'. So my find_by_name doesn't work properly
def show
if request.get?
#photographs = Category.find_by_name(params[:name]).photographs
end
end
Is-it possible to do what I want with my routes system ?

Answer 1

Don't pick the same name for the param variables.
# config/routes.rb
get '/category/:name(/:child_name)', to: 'categories#show'
# app/controllers/categories_controller.rb
def show
# Now params[:name] and params[:child_name] are available
# BTW: Only get requests will be routed anyways with your routes definition
#photographs = if params[:child_name].present?
parent = Category.find_by!(name: params[:name])
Category.find_by!(name: params[:child_name], root: parent.id)
else
Category.find_by!(name: params[:name])
end
end
Hope these hints help.
Additionally, you can see your incoming params by raising them in the controller action:
raise params.inspect