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Diffstat (limited to 'activemodel/lib/active_model/validations/associated.rb')
| -rw-r--r-- | activemodel/lib/active_model/validations/associated.rb | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/activemodel/lib/active_model/validations/associated.rb b/activemodel/lib/active_model/validations/associated.rb new file mode 100644 index 0000000000..dbb098628b --- /dev/null +++ b/activemodel/lib/active_model/validations/associated.rb @@ -0,0 +1,46 @@ +module ActiveModel + module Validations + module ClassMethods + # Validates whether the associated object or objects are all valid themselves. Works with any kind of association. + # + # class Book < ActiveRecord::Base + # has_many :pages + # belongs_to :library + # + # validates_associated :pages, :library + # end + # + # Warning: If, after the above definition, you then wrote: + # + # class Page < ActiveRecord::Base + # belongs_to :book + # + # validates_associated :book + # end + # + # ...this would specify a circular dependency and cause infinite recursion. + # + # NOTE: This validation will not fail if the association hasn't been assigned. If you want to ensure that the association + # is both present and guaranteed to be valid, you also need to use validates_presence_of. + # + # Configuration options: + # * <tt>message</tt> - A custom error message (default is: "is invalid") + # * <tt>on</tt> Specifies when this validation is active (default is :save, other options :create, :update) + # * <tt>if</tt> - Specifies a method, proc or string to call to determine if the validation should + # occur (e.g. :if => :allow_validation, or :if => Proc.new { |user| user.signup_step > 2 }). The + # method, proc or string should return or evaluate to a true or false value. + # * <tt>unless</tt> - Specifies a method, proc or string to call to determine if the validation should + # not occur (e.g. :unless => :skip_validation, or :unless => Proc.new { |user| user.signup_step <= 2 }). The + # method, proc or string should return or evaluate to a true or false value. + def validates_associated(*attr_names) + configuration = { :message => ActiveRecord::Errors.default_error_messages[:invalid], :on => :save } + configuration.update(attr_names.extract_options!) + + validates_each(attr_names, configuration) do |record, attr_name, value| + record.errors.add(attr_name, configuration[:message]) unless + (value.is_a?(Array) ? value : [value]).inject(true) { |v, r| (r.nil? || r.valid?) && v } + end + end + end + end +end
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