Field validation

[Alec Taylor]

How do I customise field validation in peewee?

In other ORMs it's possible:

SQLalchemy: http://docs.sqlalchemy.org/en/rel_0_9/orm/mapped_attributes.html
Storm: https://storm.canonical.com/Manual#Common_constructor_parameters
Django's ORM: https://docs.djangoproject.com/en/1.7/howto/custom-model-fields/

So I'm sure it's possible in peewee also.

Maybe related to this? -
http://peewee.readthedocs.org/en/latest/peewee/models.html#creating-a-custom-field

An example (would probably use validate_email package in prod):
from email.utils import parseaddr

class Email(Field):
def db_value(self, value):
email = parseaddr(value)[1]
assert '@' in value and parseaddr
return email

Also if db fields had a declarative syntax that would be very useful,
e.g.: autogenerating validation from json-schema like with:
https://github.com/topliceanu/mongoose-gen. I'm sure I could hack
together a code-generator, but that would be less useful than dynamic
support.

Alec Taylor

[Charles Leifer]

To keep peewee lightweight I did not add validations. You can add them by overriding the `save()` method or howsoever you choose.

Alec Taylor

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[Alec Taylor]

I did this, but I'm not impressed:

class EmailField(CharField):
def coerce(self, value):
# In production, recommend using: `validate_email(value,
check_mx=True, verify=True)`
assert validate_email(value), 'Expected a valid email from:
"{value}"'.format(value=value)
return super(CharField, self).coerce(value)