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Diffstat (limited to 'activemodel/lib/active_model/validations/each.rb')
| -rw-r--r-- | activemodel/lib/active_model/validations/each.rb | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/activemodel/lib/active_model/validations/each.rb b/activemodel/lib/active_model/validations/each.rb new file mode 100644 index 0000000000..e9a9e69a86 --- /dev/null +++ b/activemodel/lib/active_model/validations/each.rb @@ -0,0 +1,65 @@ +module ActiveModel + module Validations + module ClassMethods + # Adds a validation method or block to the class. This is useful when + # overriding the #validate instance method becomes too unwieldly and + # you're looking for more descriptive declaration of your validations. + # + # This can be done with a symbol pointing to a method: + # + # class Comment < ActiveRecord::Base + # validate :must_be_friends + # + # def must_be_friends + # errors.add_to_base("Must be friends to leave a comment") unless commenter.friend_of?(commentee) + # end + # end + # + # Or with a block which is passed the current record to be validated: + # + # class Comment < ActiveRecord::Base + # validate do |comment| + # comment.must_be_friends + # end + # + # def must_be_friends + # errors.add_to_base("Must be friends to leave a comment") unless commenter.friend_of?(commentee) + # end + # end + # + # This usage applies to #validate_on_create and #validate_on_update as well. + + # Validates each attribute against a block. + # + # class Person < ActiveRecord::Base + # validates_each :first_name, :last_name do |record, attr, value| + # record.errors.add attr, 'starts with z.' if value[0] == ?z + # end + # end + # + # Options: + # * <tt>on</tt> - Specifies when this validation is active (default is :save, other options :create, :update) + # * <tt>allow_nil</tt> - Skip validation if attribute is nil. + # * <tt>allow_blank</tt> - Skip validation if attribute is blank. + # * <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_each(*attrs) + options = attrs.extract_options!.symbolize_keys + attrs = attrs.flatten + + # Declare the validation. + send(validation_method(options[:on] || :save), options) do |record| + attrs.each do |attr| + value = record.send(attr) + next if (value.nil? && options[:allow_nil]) || (value.blank? && options[:allow_blank]) + yield record, attr, value + end + end + end + end + end +end
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