forms2 1.1.2

forms2: Django forms extra features
===================================

The ``forms2`` package provides an enhanced version of django forms. In particular, the SQLAchemy integration and
a per-field access control.

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Installation
------------

.. sourcecode::

pip install forms2


Usage
-----

SQLAlchemy model form example:

.. code-block:: python

class MyModelForm(SAModelForm):
class Meta:
model = MyModel
mapping = {
'field1': 'instance.child.attribute',
'field2': 'attribute3',
}
field1 = forms.IntegerField()
field2 = forms.CharField()


A simple example showing field access control:

.. code-block:: python

class MyForm(FieldAccessMixin, Form):
class Meta:
access = {
('field1', 'field2'): access_admin,
'field3': MyForm.access_admin1,
None: lambda user, instance: FieldAccess.enabled,
}
field1 = forms.IntegerField()

@classmethod
def access_admin1(cls):
return FieldAccess.readonly

A more realistic example for field access control:

.. code-block:: python

def access_bank_details(user, instance):
if not has_perm(user, instance, 'edit_bank_account'):
if has_perm(user, instance, 'edit_contract_id'):
return FieldAccess.readonly
return FieldAccess.excluded
return FieldAccess.enabled

def access_contract_id(user, instance):
if not (has_perm(user, instance, 'edit_contract_id') and has_perm(user, instance, 'do_stuff')):
return FieldAccess.readonly

class BankForm(FieldAccessMixin, Form):
class Meta:
access = {
('bank_account', 'bank_name', 'bank_balance'): access_bank_details,
'contract_id': access_contract_id,
None: BankForm.access_check,
}

bank_account = forms.CharField()
bank_name = forms.CharField()
bank_balance = forms.FloatField()

contract_id = forms.IntegerField()

some_other_field = forms.CharField()

@classmethod
def access_check(cls):
return FieldAccess.readonly

Field access control using filter syntax:

.. code-block:: python

@access_filter
def can_view_event(user, instance):
if user.has_perm('event', 'view'):
return FieldAccess.enabled

@access_filter
def can_view_merchant(user, instance):
if user.has_perm('merchant', 'view'):
return FieldAccess.enabled

@access_filter
def exclude_for_not_finance(user, instance):
if not user.has_perm('merchant', 'some_financial_permission'):
return FieldAccess.excluded

...

access = {
# Filters are applied left to right, the result is the first filter to return a FieldAccess value

# This will be enabled if you can view the event, else readonly
'field_a': can_view_event | default(FieldAccess.readonly),

# This will be enabled if you can view the event OR the merchant, else excluded
'field_b': can_view_event | can_view_merchant | default(FieldAccess.excluded),

# This will be enabled if you can view the event AND the merchant, else excluded
'field_b2': can_view_event & can_view_merchant | default(FieldAccess.excluded),

# This will be excluded if you don't have some finance permission, else enabled (this is the default)
'field_c': exclude_for_not_finance
}


Contact
-------

If you have questions, bug reports, suggestions, etc. please create an issue on
the `GitHub project page <http://github.com/paylogic/forms2>`_.


License
-------

This software is licensed under the `MIT license <http://en.wikipedia.org/wiki/MIT_License>`_

See `License <https://github.com/paylogic/forms2/blob/master/LICENSE.txt>`_


© 2013 Paylogic International.

Changelog
=========

1.1.2
-----

* Allow to pass queryset as callable to make it lazy (bubenkoff)


1.0.1
-----

* No logging of exception getting the id from the value (bubenkoff)


0.1.9
-----

* Removed relative imports (wlansu)
* Added a default instance=None to constructor method of BaseModelForm (wlansu)
* Fixed a pep8 issue in tests.__init__() (wlansu)


0.1.8
-----

* Initial public release