Question

I got an if statement like this

if can?(:read, Category) || can?(:read, Category2)

If a user can read Category or Category2 an link gets shown.

But what if i have like 10 Categorys? There must be a shorter way instead of listing them. I need a bit help.

Answer 1

Assuming you have some list of objects:

categories = [Category1, Category2, Category3]

You can get the result using inject, like this:

categories.inject(false) { |p, cat| p || can?(:read, cat) }

What this literally evaluates to is:

(((false || can(:read, Category1)) || can(:read, Category2)) || can(:read, Category3))

which of course is equivalent to:

can?(:read, Category1) || can?(:read, Category2) || can?(:read, Category3)