diff options
Diffstat (limited to 'activerecord/lib/active_record')
| -rw-r--r-- | activerecord/lib/active_record/validations.rb | 1 | ||||
| -rw-r--r-- | activerecord/lib/active_record/validations/presence.rb | 64 |
2 files changed, 65 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/validations.rb b/activerecord/lib/active_record/validations.rb index d06020b3ce..cef2bbd563 100644 --- a/activerecord/lib/active_record/validations.rb +++ b/activerecord/lib/active_record/validations.rb @@ -81,3 +81,4 @@ end require "active_record/validations/associated" require "active_record/validations/uniqueness" +require "active_record/validations/presence" diff --git a/activerecord/lib/active_record/validations/presence.rb b/activerecord/lib/active_record/validations/presence.rb new file mode 100644 index 0000000000..056527b512 --- /dev/null +++ b/activerecord/lib/active_record/validations/presence.rb @@ -0,0 +1,64 @@ +module ActiveRecord + module Validations + class PresenceValidator < ActiveModel::Validations::PresenceValidator + def validate(record) + super + attributes.each do |attribute| + next unless record.class.reflect_on_association(attribute) + value = record.send(attribute) + if Array(value).all? { |r| r.marked_for_destruction? } + record.errors.add(attribute, :blank, options) + end + end + end + end + + module ClassMethods + # Validates that the specified attributes are not blank (as defined by + # Object#blank?), and, if the attribute is an association, that the + # associated object is not marked for destruction. Happens by default + # on save. + # + # class Person < ActiveRecord::Base + # has_one :face + # validates_presence_of :face + # end + # + # The face attribute must be in the object and it cannot be blank or marked + # for destruction. + # + # If you want to validate the presence of a boolean field (where the real values + # are true and false), you will want to use + # <tt>validates_inclusion_of :field_name, :in => [true, false]</tt>. + # + # This is due to the way Object#blank? handles boolean values: + # <tt>false.blank? # => true</tt>. + # + # This validator defers to the ActiveModel validation for presence, adding the + # check to see that an associated object is not marked for destruction. This + # prevents the parent object from validating successfully and saving, which then + # deletes the associated object, thus putting the parent object into an invalid + # state. + # + # Configuration options: + # * <tt>:message</tt> - A custom error message (default is: "can't be blank"). + # * <tt>:on</tt> - Specifies when this validation is active. Runs in all + # validation contexts by default (+nil+), other options are <tt>:create</tt> + # and <tt>:update</tt>. + # * <tt>:if</tt> - Specifies a method, proc or string to call to determine if + # the validation should occur (e.g. <tt>:if => :allow_validation</tt>, or + # <tt>:if => Proc.new { |user| user.signup_step > 2 }</tt>). 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. <tt>:unless => :skip_validation</tt>, + # or <tt>:unless => Proc.new { |user| user.signup_step <= 2 }</tt>). The method, + # proc or string should return or evaluate to a true or false value. + # * <tt>:strict</tt> - Specifies whether validation should be strict. + # See <tt>ActiveModel::Validation#validates!</tt> for more information. + # + def validates_presence_of(*attr_names) + validates_with PresenceValidator, _merge_attributes(attr_names) + end + end + end +end |