Advanced usage

This section provides advanced usages of FlyForms such as Custom Fields and Custom Validators.

Custom Fields

Sometimes, it is necessary to design custom fields for validation of some special data structures. If you want do this, you should design your custom subclass of the Field class.

Field class

class flyforms.fields.Field

This the base class for all Fields.

:: automethod:: __init__

validate(value)

This is base validation of given value (type, required and choices checks)

Parameters:value (any) – the value to validate Raise:ValidationError with first error occurred during validation

is_valid(value)

The ‘silent’ variant of value validation.

Parameters:value (any) – the value to validate Returns:True if given value is valid, otherwise - False Return type:bool

Custom Validators

If you need to make additional data validation you can use your custom validators. There is one requirement: validator should be an initialized and callable object. If you want, you can use and extend one of this classes: Validator or Simple Validator.

Validator

class flyforms.validators.Validator

This the base class for all Fields.

validate(value)

Validate the given value

Parameters:value – given value to validate

:raise ValidationError if given value is not valid

is_valid(value)

The ‘silent’ variant of validation

Parameters:value – given value to validate Returns:boolean flag is given value valid Return type:bool

Simple Validator

class flyforms.validators.SimpleValidator

The Validator’s subclass with only one validation case. Given value should satisfies condition in positive_case method