CODEWITHSUNDEEP
validationweb2py
samaras
samaras

Reputation: 344

web2py validators in controller

Is it possible to use web2py validators like IS_NOT_EMPTY() in the controller? They seem to be imported but in the controller, however they are not useful at all. Which parameters should I use when calling them.

Upvotes: 1

Views: 678

Answers (1)

Anthony
Anthony

Reputation: 25536

Validators are generally specified as the requires attribute of DAL Field objects, typically when the models are defined. You can also specify the requires attribute of a Field in a controller (this is typically done when validators or their arguments are conditional and not determined until a particular contoller action is called). When generating a FORM object manually, you can also assign validators to the requires attribute of the form helpers, such as INPUT, SELECT, etc.

You can also instantiate and call validators directly, though this is less common. To do so, first instantiate the validator object (possibly passing arguments if the validator constructor takes any), and then call the object by passing in a single value to be validated. The validator will return a 2-tuple -- the first element will be the validated value (possibly transformed if the validator does a transformation), and the second will be either None or an error message (if validation failed). For example:

>>> IS_EMAIL()('bademail')
('bademail', 'enter a valid email address')
>>> IS_EMAIL()('[email protected]')
('[email protected]', None)

Upvotes: 5

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