Added Base.validate_uniqueness thatv alidates whether the value of the...
Added Base.validate_uniqueness thatv alidates whether the value of the specified attributes are unique across the system. Useful for making sure that only one user can be named "davidhh". git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@108 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
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