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Document the validates class method. Closes #10216 [Farley Knight]

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git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@8345 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
This commit is contained in:
Jeremy Kemper
2007-12-10 00:47:55 +00:00
parent 62ddeaf052
commit 1542886e40
1 changed files with 27 additions and 1 deletions
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28
activerecord/lib/active_record/validations.rb
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@@ -297,7 +297,33 @@ module ActiveRecord
:equal_to => '==', :less_than => '<', :less_than_or_equal_to => '<=',
:odd => 'odd?', :even => 'even?' }.freeze
# Adds a validation method or block to the class. This is useful when
# overriding the #validate instance method becomes too unwieldly and
# you're looking for more descriptive declaration of your validations.
#
# This can be done with a symbol pointing to a method:
#
# class Comment < ActiveRecord::Base
# validate :must_be_friends
#
# def must_be_friends
# errors.add_to_base("Must be friends to leave a comment") unless commenter.friend_of?(commentee)
# end
# end
#
# Or with a block which is passed the current record to be validated:
#
# class Comment < ActiveRecord::Base
# validate do |comment|
# comment.must_be_friends
# end
#
# def must_be_friends
# errors.add_to_base("Must be friends to leave a comment") unless commenter.friend_of?(commentee)
# end
# end
#
# This usage applies to #validate_on_create and #validate_on_update as well.
def validate(*methods, &block)
methods << block if block_given?
write_inheritable_set(:validate, methods)