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Advanced concepts
=================
Using WTForms-Alchemy with SQLAlchemy-Defaults
----------------------------------------------
WTForms-Alchemy works wonderfully with `SQLAlchemy-Defaults`_. When using `SQLAlchemy-Defaults`_ with WTForms-Alchemy you
can define your models and model forms with much more robust syntax. For more information see `SQLAlchemy-Defaults`_ documentation.
.. _SQLAlchemy-Defaults: https://github.com/kvesteri/sqlalchemy-defaults
Example ::
from sqlalchemy_defaults import LazyConfigured
class User(Base, LazyConfigured):
__tablename__ = 'user'
id = sa.Column(sa.Integer, primary_key=True)
name = sa.Column(
sa.Unicode(255),
nullable=False,
label=u'Name'
)
age = sa.Column(
sa.Integer,
nullable=False,
min=18,
max=100,
label=u'Age'
)
class UserForm(ModelForm):
class Meta:
model = User
Using WTForms-Alchemy with Flask-WTF
------------------------------------
In order to make WTForms-Alchemy work with `Flask-WTF`_ you need the following snippet:
.. _Flask-WTF: https://github.com/lepture/flask-wtf/
::
from flask_wtf import FlaskForm
from wtforms_alchemy import model_form_factory
# The variable db here is a SQLAlchemy object instance from
# Flask-SQLAlchemy package
from myproject.extensions import db
BaseModelForm = model_form_factory(FlaskForm)
class ModelForm(BaseModelForm):
@classmethod
def get_session(self):
return db.session
Then you can use the ModelForm just like before:
::
class UserForm(ModelForm):
class Meta:
model = User
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