82 lines
3.2 KiB
Ruby
82 lines
3.2 KiB
Ruby
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module CouchRest
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module Validation
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##
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#
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# @author Guy van den Berg
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# @since 0.9
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class NumericValidator < GenericValidator
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def initialize(field_name, options={})
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super
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@field_name, @options = field_name, options
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@options[:integer_only] = false unless @options.has_key?(:integer_only)
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end
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def call(target)
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value = target.send(field_name)
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return true if @options[:allow_nil] && value.nil?
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value = value.kind_of?(BigDecimal) ? value.to_s('F') : value.to_s
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error_message = @options[:message]
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precision = @options[:precision]
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scale = @options[:scale]
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if @options[:integer_only]
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return true if value =~ /\A[+-]?\d+\z/
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error_message ||= ValidationErrors.default_error_message(:not_an_integer, field_name)
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else
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# FIXME: if precision and scale are not specified, can we assume that it is an integer?
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# probably not, as floating point numbers don't have hard
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# defined scale. the scale floats with the length of the
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# integral and precision. Ie. if precision = 10 and integral
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# portion of the number is 9834 (4 digits), the max scale will
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# be 6 (10 - 4). But if the integral length is 1, max scale
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# will be (10 - 1) = 9, so 1.234567890.
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if precision && scale
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#handles both Float when it has scale specified and BigDecimal
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if precision > scale && scale > 0
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return true if value =~ /\A[+-]?(?:\d{1,#{precision - scale}}|\d{0,#{precision - scale}}\.\d{1,#{scale}})\z/
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elsif precision > scale && scale == 0
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return true if value =~ /\A[+-]?(?:\d{1,#{precision}}(?:\.0)?)\z/
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elsif precision == scale
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return true if value =~ /\A[+-]?(?:0(?:\.\d{1,#{scale}})?)\z/
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else
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raise ArgumentError, "Invalid precision #{precision.inspect} and scale #{scale.inspect} for #{field_name} (value: #{value.inspect} #{value.class})"
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end
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elsif precision && scale.nil?
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# for floats, if scale is not set
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#total number of digits is less or equal precision
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return true if value.gsub(/[^\d]/, '').length <= precision
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#number of digits before decimal == precision, and the number is x.0. same as scale = 0
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return true if value =~ /\A[+-]?(?:\d{1,#{precision}}(?:\.0)?)\z/
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else
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return true if value =~ /\A[+-]?(?:\d+|\d*\.\d+)\z/
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end
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error_message ||= ValidationErrors.default_error_message(:not_a_number, field_name)
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end
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add_error(target, error_message, field_name)
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# TODO: check the gt, gte, lt, lte, and eq options
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return false
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end
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end # class NumericValidator
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module ValidatesIsNumber
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# Validate whether a field is numeric
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#
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def validates_is_number(*fields)
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opts = opts_from_validator_args(fields)
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add_validator_to_context(opts, fields, CouchRest::Validation::NumericValidator)
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end
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end # module ValidatesIsNumber
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end # module Validation
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end # module CouchRest
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