35 lines
908 B
Ruby
35 lines
908 B
Ruby
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class Conversion
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include ActiveModel::Validations
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include ActiveModel::Conversion
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extend ActiveModel::Naming
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attr_accessor :input_quantity, :input_units, :scale, :output_units, :density
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attr_reader :output_quantity
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validates :input_quantity, presence: true
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validate :check_conversion, :if => Proc.new { |object| object.errors.empty? }
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def initialize(attrs = nil)
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if attrs
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attrs.each do |k, v|
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send("#{k}=", v)
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end
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end
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@output_quantity = nil
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end
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def check_conversion
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begin
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scale = self.scale.blank? ? '1' : self.scale
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density = self.density.blank? ? nil : self.density
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@output_quantity = UnitConversion.convert(input_quantity, scale, input_units, output_units, density)
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rescue UnitConversion::UnparseableUnitError => err
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errors[:base] << "Invalid Data: #{err.message}"
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end
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end
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def persisted?
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false
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end
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end
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