method

validates_length_of

v5.0.0.1 - Show latest stable - 1 note - Class: ActiveRecord::Validations::ClassMethods

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What's this?

validates_length_of(*attr_names) public

Validates that the specified attributes match the length restrictions supplied. If the attribute is an association, records that are marked for destruction are not counted.

See ActiveModel::Validations::HelperMethods.validates_length_of for more information.

Show source

# File activerecord/lib/active_record/validations/length.rb, line 17
      def validates_length_of(*attr_names)
        validates_with LengthValidator, _merge_attributes(attr_names)
      end

March 13, 2010

3 thanks

Can be used with has_many associations

You can also use this to validate that a has_many association has a specified number of records on the other end:

has_many :members

validates_length_of :members, :minimum => 1

validates_length_of

Related methods

Can be used with has_many associations