SAValidation 0.1.1

Active Record like validation on SQLAlchemy declarative model objects

Introduction

SAValidation Facilitates Active Record like validation on SQLAlchemy declarative model objects.

You can install the in-development version of savalidation with easy_install savalidation==dev.

The home page is currently the bitbucket repository.

Usage Example

The following is a snippet from the examples.py file:

from datetime import datetime
import formencode
import sqlalchemy as sa
import sqlalchemy.ext.declarative as sadec
import sqlalchemy.sql as sasql
import sqlalchemy.orm as saorm

from savalidation import declarative_base, ValidatingSessionExtension,         ValidationError, ValidationMixin
import savalidation.validators as val

engine = sa.create_engine('sqlite://')
meta = sa.MetaData()
Base = declarative_base(metadata=meta)

Session = saorm.scoped_session(
    saorm.sessionmaker(
        bind=engine,
        autoflush=False,
        extension=ValidatingSessionExtension()
    )
)

sess = Session

class Family(Base, ValidationMixin):
    __tablename__ = 'families'

    # SA COLUMNS
    id = sa.Column(sa.Integer, primary_key=True)
    createdts = sa.Column(sa.DateTime, nullable=False, default=datetime.now, server_default=sasql.text('CURRENT_TIMESTAMP'))
    updatedts = sa.Column(sa.DateTime, onupdate=datetime.now)
    name =  sa.Column(sa.Unicode(75), nullable=False, unique=True)
    reg_num = sa.Column(sa.Integer, nullable=False, unique=True)
    status =  sa.Column(sa.Unicode(15), nullable=False, default=u'active', server_default=u'active')

    # VALIDATION
    STATUS_CHOICES = (
        ('active', 'Active'),
        ('inactive', 'Inactive'),
        ('moved', 'Moved'),
    )
    # will validate nullability & length of string types
    val.validates_constraints()
    val.validates_one_of('status', [k for k, v in STATUS_CHOICES])

    #OTHER
    def __str__(self):
        return '<Family id=%s, name=%s>' % (self.id, self.name)

class Person(Base, ValidationMixin):
    __tablename__ = 'people'

    id = sa.Column(sa.Integer, primary_key=True)
    createdts = sa.Column(sa.DateTime, nullable=False, server_default=sasql.text('CURRENT_TIMESTAMP'))
    updatedts = sa.Column(sa.DateTime, onupdate=datetime.now)
    name_first = sa.Column(sa.Unicode(75), nullable=False)
    name_last = sa.Column(sa.Unicode(75), nullable=False)
    family_role = sa.Column(sa.Unicode(20), nullable=False)
    nullable_but_required = sa.Column(sa.Unicode(5))
    birthdate = sa.Column(sa.Date)

    ROLE_CHOICES = (
        ('father', 'Father'),
        ('mother', 'Mother'),
        ('child', 'Child'),
    )
    val.validates_constraints(exclude='createdts')
    val.validates_presence_of('nullable_but_required')
    val.validates_choices('family_role', ROLE_CHOICES)
    # will automatically convert the string to a python datetime.date object
    val.converts_date('birthdate')

See more examples in the tests directory of the distribution.

Installing & Testing Source

(this is one way, there are others)

1. create a virtualenv

2. activate the virtualenv

3. pip install -e "hg+http://bitbucket.org/rsyring/sqlalchemy-validation#egg=savlidation-dev"

4. pip install nose

5. cd src/savalidation/savalidation

6. nosetests

Questions & Comments

Please visit: http://groups.google.com/group/blazelibs

Dependencies

• SQLAlchemy

• FormEncode

• python-dateutil (for date/time converters)

• Nose (if you want to run the tests)

Credits

This project borrows code and ideas from:

• Sqlalchemy Validations

• Elixir

Current Status

The code itself seems stable, but the API is likely to change in the future.