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68 lines
3.6 KiB
Ruby
68 lines
3.6 KiB
Ruby
require 'active_support/core_ext/range.rb'
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module ActiveModel
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# == Active Model Exclusion Validator
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module Validations
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class ExclusionValidator < EachValidator
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ERROR_MESSAGE = "An object with the method #include? or a proc or lambda is required, " <<
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"and must be supplied as the :in option of the configuration hash"
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def check_validity!
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unless [:include?, :call].any? { |method| options[:in].respond_to?(method) }
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raise ArgumentError, ERROR_MESSAGE
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end
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end
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def validate_each(record, attribute, value)
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delimiter = options[:in]
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exclusions = delimiter.respond_to?(:call) ? delimiter.call(record) : delimiter
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if exclusions.send(inclusion_method(exclusions), value)
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record.errors.add(attribute, :exclusion, options.except(:in).merge!(:value => value))
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end
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end
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private
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# In Ruby 1.9 <tt>Range#include?</tt> on non-numeric ranges checks all possible values in the
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# range for equality, so it may be slow for large ranges. The new <tt>Range#cover?</tt>
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# uses the previous logic of comparing a value with the range endpoints.
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def inclusion_method(enumerable)
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enumerable.is_a?(Range) ? :cover? : :include?
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end
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end
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module HelperMethods
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# Validates that the value of the specified attribute is not in a particular enumerable object.
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#
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# class Person < ActiveRecord::Base
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# validates_exclusion_of :username, :in => %w( admin superuser ), :message => "You don't belong here"
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# validates_exclusion_of :age, :in => 30..60, :message => "This site is only for under 30 and over 60"
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# validates_exclusion_of :format, :in => %w( mov avi ), :message => "extension %{value} is not allowed"
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# validates_exclusion_of :password, :in => lambda { |p| [p.username, p.first_name] }, :message => "should not be the same as your username or first name"
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# end
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#
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# Configuration options:
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# * <tt>:in</tt> - An enumerable object of items that the value shouldn't be part of.
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# This can be supplied as a proc or lambda which returns an enumerable. If the enumerable
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# is a range the test is performed with <tt>Range#cover?</tt>
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# (backported in Active Support for 1.8), otherwise with <tt>include?</tt>.
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# * <tt>:message</tt> - Specifies a custom error message (default is: "is reserved").
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# * <tt>:allow_nil</tt> - If set to true, skips this validation if the attribute is +nil+ (default is +false+).
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# * <tt>:allow_blank</tt> - If set to true, skips this validation if the attribute is blank (default is +false+).
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# * <tt>:on</tt> - Specifies when this validation is active. Runs in all
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# validation contexts by default (+nil+), other options are <tt>:create</tt>
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# and <tt>:update</tt>.
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# * <tt>:if</tt> - Specifies a method, proc or string to call to determine if the validation should
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# occur (e.g. <tt>:if => :allow_validation</tt>, or <tt>:if => Proc.new { |user| user.signup_step > 2 }</tt>). The
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# method, proc or string should return or evaluate to a true or false value.
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# * <tt>:unless</tt> - Specifies a method, proc or string to call to determine if the validation should
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# not occur (e.g. <tt>:unless => :skip_validation</tt>, or <tt>:unless => Proc.new { |user| user.signup_step <= 2 }</tt>). The
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# method, proc or string should return or evaluate to a true or false value.
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def validates_exclusion_of(*attr_names)
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validates_with ExclusionValidator, _merge_attributes(attr_names)
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end
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end
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end
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end
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