Question

I think this is an easy question but I can’t seem to wrap my head around it to solve it. I want to create an instance variable from a property of another instance variable.
For example:

@posts = Post.find(:all, :conditions => ['day > ?', Date.today], :order => 'day')

I want to get another instance variable that contains all of the dates from the @posts. Is there a way of quickly getting it without having to create a helper/function?
Thanks!

Answer 1

@posts.map(&:day)

which is a shorthand for

@posts.map do |post|
  post.day
end

The result is an array of the value of each post.day