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rails--rails/guides/code/getting_started/app/models/post.rb

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class Post < ActiveRecord::Base
validates :title, :presence => true,
:length => { :minimum => 5 }
has_many :comments, :dependent => :destroy
accepts_nested_attributes_for :tags, :allow_destroy => :true,
:reject_if => proc { |attrs| attrs.all? { |k, v| v.blank? } }
end