18 lines
449 B
Ruby
18 lines
449 B
Ruby
class DensityValidator < ActiveModel::EachValidator
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def validate_each(record, attribute, value)
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valid = false
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msg = 'is not a unit of density'
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begin
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unit = UnitConversion::parse(value)
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valid = UnitConversion::density? unit
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rescue UnitConversion::UnparseableUnitError => e
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valid = false
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msg = e.message
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end
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unless valid
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record.errors[attribute] << (options[:message] || msg)
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end
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end
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end |