将链式示波器作为第3栏上的参数传递？

Question

i have this on my view:

<%= link_to "shirts", things_path (:scope => "shirts" ) %>

this on my controller

@products = Product.send(params[:scope])

however i would like to use chained scopes such as:

<%= link_to "shirts", products_path (:scope => "shirts.blue" )  %>

but for some reason that doesnt work.

Probably my syntax is wrong?

Answer 1

If you gonna use params as argument for send method, don't forget to check it by the whitelist of scopes:

safe_scopes = %w(shirts pants boots blue red yellow)

and then you can go with fl00r 's soulution:

@products = Product.scoped
params[:scope].split(".").each{|scope| @products = @products.send(scope) if safe_scopes.include?(scope)}

because someone will try to send ?scope=shirts.destroy_all to your controller or smth else.

Answer 2

Try this

<%= link_to "shirts", products_path (:scope => "shirts.blue" ) %>

Model

@products = Product.scoped
params[:scope].split(".").each{|scope| @products = @products.send(scope)}