/
numericality.rb
36 lines (32 loc) · 1.4 KB
/
numericality.rb
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# frozen_string_literal: true
module ActiveRecord
module Validations
class NumericalityValidator < ActiveModel::Validations::NumericalityValidator # :nodoc:
def validate_each(record, attribute, value, precision: nil, scale: nil)
precision = [column_precision_for(record, attribute) || Float::DIG, Float::DIG].min
scale = column_scale_for(record, attribute)
super(record, attribute, value, precision: precision, scale: scale)
end
private
def column_precision_for(record, attribute)
record.class.type_for_attribute(attribute.to_s)&.precision
end
def column_scale_for(record, attribute)
record.class.type_for_attribute(attribute.to_s)&.scale
end
end
module ClassMethods
# Validates whether the value of the specified attribute is numeric by
# trying to convert it to a float with +Kernel.Float+ (if
# <tt>only_integer</tt> is +false+) or applying it to the regular
# expression <tt>/\A[\+\-]?\d+\z/</tt> (if <tt>only_integer</tt> is set to
# +true+). +Kernel.Float+ precision defaults to the column's precision
# value or 15.
#
# See ActiveModel::Validations::HelperMethods.validates_numericality_of for more information.
def validates_numericality_of(*attr_names)
validates_with NumericalityValidator, _merge_attributes(attr_names)
end
end
end
end