validates_length_of Validation

The validates_length_of validation in ActiveRecord allows you to validate the length of an attribute's value, such as a string or an array. You can set minimum and maximum length constraints to ensure that the attribute's value falls within the desired range. To use validates_length_of, you need to specify the following options:

• Attribute Name: This option specifies the name of the attribute you want to validate. It is typically set as a symbol or string.

  static $validates_length_of = [
      'name' => []
  ];
  

• Minimum Length (Optional): You can set the minimum length that the attribute's value must have by using the minimum option. If the value is shorter than the specified minimum, the validation will fail.

  static $validates_length_of = [
      'name' => [
          'minimum' => 3
      ]
  ];
  

• Maximum Length (Optional): You can set the maximum length that the attribute's value can have by using the maximum option. If the value exceeds the specified maximum, the validation will fail.

  static $validates_length_of = [
      'description' => [
          'maximum' => 255
      ]
  ];
  

• Message (Optional): To customize the error message displayed when the validation fails, you can use the too_short and too_long options to provide custom error messages.

  static $validates_length_of = [
      'username' => [
          'minimum' => 6,
          'message' => 'Username is too short (minimum is 6 characters)',
      ],
      'bio' => [
          'maximum' => 500,
          'message' => 'Bio is too long (maximum is 500 characters)',
      ],
  ];
  

Example of Usage:

class User extends ActiveRecord\Model {
    static $validates_length_of = ['username' => ['minimum' => 3, 'maximum' => 20]];
}