Argument Error: The scope body needs to be callable

Question

I\'m working through the \'Ruby On Rails 3 Essential Training\' and have received a problem when using name scopes. When finding records and using queries withing the Rails

Answer 1

What you are using: scope :visible, where(:visible => true) goes for eager loading, and has been deprecated in Rails 4.

scope :visible, where(:visible => true)

This line of code gets evaluated when the particular class is loaded, and not at the time, this very scope is called.

There are a few cases when this thing does matter, like:

scope :future, where('published_at > ?', Time.now)
scope :future, -> { where('published_at > ?', Time.now) }

In first case, ? will be replaced with the very time the class would have been loaded, but the second & correct case, that time will be used at which the scope would have been called on the class.