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

The scope's body needs to be wrapped in something callable like a Proc or Lambda:

scope :visible, -> {
  where(:visible => true)
}

The reason for this is that it ensures the contents of the block is evaluated each time the scope is used.