37 lines
2.3 KiB
Ruby
37 lines
2.3 KiB
Ruby
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module ActiveModel
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module Validations
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module ClassMethods
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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 %s is not allowed"
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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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# * <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>: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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configuration = { :message => ActiveRecord::Errors.default_error_messages[:exclusion], :on => :save }
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configuration.update(attr_names.extract_options!)
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enum = configuration[:in] || configuration[:within]
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raise(ArgumentError, "An object with the method include? is required must be supplied as the :in option of the configuration hash") unless enum.respond_to?("include?")
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validates_each(attr_names, configuration) do |record, attr_name, value|
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record.errors.add(attr_name, configuration[:message] % value) if enum.include?(value)
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end
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end
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end
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end
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end
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