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Diffstat (limited to 'activemodel/lib/active_model/validations/presence.rb')
| -rw-r--r-- | activemodel/lib/active_model/validations/presence.rb | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/activemodel/lib/active_model/validations/presence.rb b/activemodel/lib/active_model/validations/presence.rb new file mode 100644 index 0000000000..3dd2c97cd8 --- /dev/null +++ b/activemodel/lib/active_model/validations/presence.rb @@ -0,0 +1,38 @@ +module ActiveModel + module Validations + module ClassMethods + # Validates that the specified attributes are not blank (as defined by Object#blank?). Happens by default on save. Example: + # + # class Person < ActiveRecord::Base + # validates_presence_of :first_name + # end + # + # The first_name attribute must be in the object and it cannot be blank. + # + # If you want to validate the presence of a boolean field (where the real values are true and false), + # you will want to use validates_inclusion_of :field_name, :in => [true, false] + # This is due to the way Object#blank? handles boolean values. false.blank? # => true + # + # Configuration options: + # * <tt>message</tt> - A custom error message (default is: "can't be blank") + # * <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_presence_of(*attr_names) + configuration = { :message => ActiveRecord::Errors.default_error_messages[:blank], :on => :save } + configuration.update(attr_names.extract_options!) + + # can't use validates_each here, because it cannot cope with nonexistent attributes, + # while errors.add_on_empty can + send(validation_method(configuration[:on]), configuration) do |record| + record.errors.add_on_blank(attr_names, configuration[:message]) + end + end + end + end +end
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