18 lines
626 B
Ruby
18 lines
626 B
Ruby
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# This validator is very similar to the less_than_or_equal_to option for the
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# numericality validator, but it computes the difference between the value and
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# the maximum so that it can be included in the error message.
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class AtMostValidator < ActiveModel::EachValidator
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def validate_each(record, attribute, value)
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maximum = options[:maximum]
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maximum = record.send(maximum) if maximum.is_a?(Symbol)
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maximum = maximum.call(record) if maximum.is_a?(Proc)
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return unless value > maximum
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record.errors.add(
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attribute, :at_most,
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value: value, count: maximum, diff: value - maximum
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)
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end
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end
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