Source code for fobi.dynamic
__title__ = 'fobi.dynamic'
__author__ = 'Artur Barseghyan <artur.barseghyan@gmail.com>'
__copyright__ = 'Copyright (c) 2014 Artur Barseghyan'
__license__ = 'GPL 2.0/LGPL 2.1'
__all__ = ('assemble_form_class',)
import logging
from six import with_metaclass
from django.utils.datastructures import SortedDict
from django.forms.forms import BaseForm#, get_declared_fields
from django.forms.widgets import media_property
logger = logging.getLogger(__file__)
# ******************************************************************************
# ******************************************************************************
# **************************** Form generator **********************************
# ******************************************************************************
# ******************************************************************************
[docs]def assemble_form_class(form_entry, base_class=BaseForm, request=None, \
origin=None, origin_kwargs_update_func=None, origin_return_func=None,
form_element_entries=None):
"""
Assembles a form class by given entry.
:param form_entry:
:param base_class:
:param django.http.HttpRequest request:
:param string origin:
:param callable origin_kwargs_update_func:
:param callable origin_return_func:
:param iterable form_element_entries: If given, used instead of ``form_entry.formelemententry_set.all`` (no
additional database hit).
"""
if form_element_entries is None:
form_element_entries = form_entry.formelemententry_set.all()
class DeclarativeFieldsMetaclass(type):
"""
Copied from ``django.forms.forms.DeclarativeFieldsMetaclass``.
Metaclass that converts Field attributes to a dictionary called 'base_fields', taking into
account parent class 'base_fields' as well.
"""
def __new__(cls, name, bases, attrs):
base_fields = []
for creation_counter, form_element_entry in enumerate(form_element_entries):
plugin = form_element_entry.get_plugin(request=request)
plugin_form_field_instances = plugin._get_form_field_instances(
form_element_entry = form_element_entry,
origin = origin,
kwargs_update_func = origin_kwargs_update_func,
return_func = origin_return_func,
extra = {'counter': creation_counter}
)
for form_field_name, form_field_instance in plugin_form_field_instances:
base_fields.append((form_field_name, form_field_instance))
attrs['base_fields'] = SortedDict(base_fields)
new_class = super(DeclarativeFieldsMetaclass, cls).__new__(cls, name, bases, attrs)
if 'media' not in attrs:
new_class.media = media_property(new_class)
return new_class
class DynamicForm(with_metaclass(DeclarativeFieldsMetaclass, base_class)):
"""
Dynamically created form element plugin class.
"""
return DynamicForm