module DataMapper
module Validate
##
#
# @author Guy van den Berg
# @since 0.9
class NumericValidator < GenericValidator
def initialize(field_name, options={})
super
@field_name, @options = field_name, options
@options[:integer_only] = false unless @options.has_key?(:integer_only)
end
def call(target)
value = target.attribute_get(field_name)
return true if @options[:allow_nil] && value.nil?
value = value.kind_of?(BigDecimal) ? value.to_s('F') : value.to_s
error_message = @options[:message]
scale = @options[:scale]
precision = @options[:precision]
if @options[:integer_only]
return true if value =~ /\A[+-]?\d+\z/
error_message ||= '%s must be an integer'.t(DataMapper::Inflection.humanize(@field_name))
else
if scale && precision
if scale == precision
return true if value =~ /\A(?:0\.\d{1,#{precision}})\z/
elsif precision == 0
return true if value =~ /\A(?:\d{1,#{scale}}(?:\.0)?)\z/
else
return true if value =~ /\A(?:\d{1,#{scale - precision}}|\d{0,#{scale - precision}}\.\d{1,#{precision}})\z/
end
else
return true if value =~ /\A(?:\d+|\d*\.\d+)\z/
end
error_message ||= '%s must be a number'.t(DataMapper::Inflection.humanize(@field_name))
end
add_error(target, error_message, @field_name)
# TODO: check the gt, gte, lt, lte, and eq options
return false
end
end # class NumericValidator
module ValidatesIsNumber
# Validate whether a field is numeric
#
def validates_is_number(*fields)
opts = opts_from_validator_args(fields)
add_validator_to_context(opts, fields, DataMapper::Validate::NumericValidator)
end
end # module ValidatesIsNumber
end # module Validate
end # module DataMapper
