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module Ecom
module Core
class MeasurementUnit < ApplicationRecord
METRIC = 'Metric'.freeze
IMPERIAL = 'Imperial'.freeze
SYSTEM_OF_MEASURMENT = [METRIC, IMPERIAL].freeze
# commonly used physical quantities in construction
LENGTH = 'Length'.freeze
MASS = 'Mass'.freeze
TIME = 'Time'.freeze
CURRENT = 'Current'.freeze
TEMPRATURE = 'Temprature'.freeze
AREA = 'Area'.freeze
VOLUME = 'Volume'.freeze
ENERGY = 'Energy'.freeze
DENSITY = 'DENSITY'.freeze
PHYSICAL_QUANTITIES = [LENGTH, MASS, TIME, CURRENT, TEMPRATURE, AREA, VOLUME, ENERGY, DENSITY].freeze
validates :name, :abbrivation, :physical_quantity,
:conversion_factor, :system_of_measurement, presence: true
validates :is_si_unit, inclusion: { in: [true, false] }
validates :system_of_measurement, inclusion: SYSTEM_OF_MEASURMENT
validates :physical_quantity, inclusion: PHYSICAL_QUANTITIES
validate :si_unit_with_conversion_factor
validates_uniqueness_of :is_si_unit, scope: %i[physical_quantity system_of_measurement],
if: -> { is_si_unit == true },
message: 'There exist an si unit of measurement for the '\
'given physical quantity and system of measurement'
def si_unit_with_conversion_factor
if is_si_unit && conversion_factor != 1
errors.add(:base, 'Conversion factor for an SI unit has to be 1')
elsif !is_si_unit && conversion_factor == 1
errors.add(:base, 'Only SI units can have a conversion factor 1')
end
end
end
end
end
Version data entries
15 entries across 15 versions & 1 rubygems