couchrest_model/lib/couchrest/validation/validators/length_validator.rb
Matt Aimonetti dfdcd79a58 Started added a validation mixin
Usage:
  class Invoice < CouchRest::ExtendedDocument
    include CouchRest::Validation

    property :client_name
    property :employee_name
    property :location

    # Validation
    validates_present :client_name, :employee_name
    validates_present :location, :message => "Hey stupid!, you forgot the location"

  end
2009-02-02 19:21:32 -08:00

135 lines
4.9 KiB
Ruby

# Extracted from dm-validations 0.9.10
#
# Copyright (c) 2007 Guy van den Berg
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
module CouchRest
module Validation
##
#
# @author Guy van den Berg
# @since 0.9
class LengthValidator < GenericValidator
def initialize(field_name, options)
super
@field_name = field_name
@options = options
@min = options[:minimum] || options[:min]
@max = options[:maximum] || options[:max]
@equal = options[:is] || options[:equals]
@range = options[:within] || options[:in]
@validation_method ||= :range if @range
@validation_method ||= :min if @min && @max.nil?
@validation_method ||= :max if @max && @min.nil?
@validation_method ||= :equals unless @equal.nil?
end
def call(target)
field_value = target.validation_property_value(field_name)
return true if @options[:allow_nil] && field_value.nil?
field_value = '' if field_value.nil?
# XXX: HACK seems hacky to do this on every validation, probably should
# do this elsewhere?
field = Extlib::Inflection.humanize(field_name)
min = @range ? @range.min : @min
max = @range ? @range.max : @max
equal = @equal
case @validation_method
when :range then
unless valid = @range.include?(field_value.size)
error_message = ValidationErrors.default_error_message(:length_between, field, min, max)
end
when :min then
unless valid = field_value.size >= min
error_message = ValidationErrors.default_error_message(:too_short, field, min)
end
when :max then
unless valid = field_value.size <= max
error_message = ValidationErrors.default_error_message(:too_long, field, max)
end
when :equals then
unless valid = field_value.size == equal
error_message = ValidationErrors.default_error_message(:wrong_length, field, equal)
end
end
error_message = @options[:message] || error_message
add_error(target, error_message, field_name) unless valid
return valid
end
end # class LengthValidator
module ValidatesLength
# Validates that the length of the attribute is equal to, less than,
# greater than or within a certain range (depending upon the options
# you specify).
#
# @option :allow_nil<Boolean> true/false (default is true)
# @option :minimum ensures that the attribute's length is greater than
# or equal to the supplied value
# @option :min alias for :minimum
# @option :maximum ensures the attribute's length is less than or equal
# to the supplied value
# @option :max alias for :maximum
# @option :equals ensures the attribute's length is equal to the
# supplied value
# @option :is alias for :equals
# @option :in<Range> given a Range, ensures that the attributes length is
# include?'ed in the Range
# @option :within<Range> alias for :in
#
# @example [Usage]
#
# class Page
#
# property high, Integer
# property low, Integer
# property just_right, Integer
#
# validates_length :high, :min => 100000000000
# validates_length :low, :equals => 0
# validates_length :just_right, :within => 1..10
#
# # a call to valid? will return false unless:
# # high is greater than or equal to 100000000000
# # low is equal to 0
# # just_right is between 1 and 10 (inclusive of both 1 and 10)
#
def validates_length(*fields)
opts = opts_from_validator_args(fields)
add_validator_to_context(opts, fields, CouchRest::Validation::LengthValidator)
end
end # module ValidatesLength
end # module Validation
end # module CouchRest