46 lines
2.3 KiB
Ruby
46 lines
2.3 KiB
Ruby
module ActiveModel
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module Validations
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module ClassMethods
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# Validates whether the associated object or objects are all valid themselves. Works with any kind of association.
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#
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# class Book < ActiveRecord::Base
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# has_many :pages
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# belongs_to :library
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#
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# validates_associated :pages, :library
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# end
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#
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# Warning: If, after the above definition, you then wrote:
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#
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# class Page < ActiveRecord::Base
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# belongs_to :book
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#
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# validates_associated :book
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# end
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#
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# ...this would specify a circular dependency and cause infinite recursion.
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#
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# NOTE: This validation will not fail if the association hasn't been assigned. If you want to ensure that the association
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# is both present and guaranteed to be valid, you also need to use +validates_presence_of+.
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#
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# Configuration options:
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# * <tt>:message</tt> - A custom error message (default is: "is invalid")
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# * <tt>:on</tt> - Specifies when this validation is active (default is <tt>:save</tt>, other options <tt>:create</tt>, <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_associated(*attr_names)
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configuration = { :message => ActiveRecord::Errors.default_error_messages[:invalid], :on => :save }
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configuration.update(attr_names.extract_options!)
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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]) unless
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(value.is_a?(Array) ? value : [value]).inject(true) { |v, r| (r.nil? || r.valid?) && v }
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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 |