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By: a guest on Apr 26th, 2012  |  syntax: None  |  size: 0.32 KB  |  hits: 10  |  expires: Never
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  1. Rails Unique names in the scope of a parent
  2. class Author    
  3.   has_many :books
  4.  
  5. class Book
  6.   belongs_to :author
  7.   validates :name, :presence => true, :uniqueness => true
  8.        
  9. validates :name, :presence => true, :uniqueness => true, :scope => :author
  10.        
  11. validates :name, :presence => true, :uniqueness => {:scope => :author_id}
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