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harssh/validate_unique_combination_of_multiple_columns_in_rails.rb

Created October 27, 2013 16:33
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Rails: Validate unique combination of multiple columns
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validate_unique_combination_of_multiple_columns_in_rails.rb
The validation syntax where multiple columns combination is validated for uniqueness is :
validates_uniqueness_of :column_namae1, :scope => [:column_name2, :column_name3]
or even shorter in ruby 1.9.x:
validates_uniqueness_of :column_name1, scope: [:column_name2, :column_name3]
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