Model Validation

Validation Helpers

• validates_acceptance_of
• validates_associated
• validates_confirmation_of
• validates_exclusion_of
• validates_format_of
• validates_inclusion_of
• validates_length_of
• validates_numericality_of
• validates_presence_of
• validates_uniqueness_of
• validates_each

Common Validation Options

• :allow_nil
• :allow_blank
• :message
• :on

http://guides.rails.info/activerecord_validations_callbacks.html