mirror of
https://github.com/jazzband/django-eav2.git
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121 lines
4.6 KiB
Python
121 lines
4.6 KiB
Python
#!/usr/bin/env python
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# vim: ai ts=4 sts=4 et sw=4 coding=utf-8
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#
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# This software is derived from EAV-Django originally written and
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# copyrighted by Andrey Mikhaylenko <http://pypi.python.org/pypi/eav-django>
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#
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# This is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License as published
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# by the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This software is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with EAV-Django. If not, see <http://gnu.org/licenses/>.
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from copy import deepcopy
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# django
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from django.forms import BooleanField, CharField, DateTimeField, FloatField, \
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IntegerField, ModelForm, ChoiceField, ValidationError
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from django.contrib.admin.widgets import AdminSplitDateTime
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from django.utils.translation import ugettext_lazy as _
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class BaseDynamicEntityForm(ModelForm):
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"""
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ModelForm for entity with support for EAV attributes. Form fields are created
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on the fly depending on Schema defined for given entity instance. If no schema
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is defined (i.e. the entity instance has not been saved yet), only static
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fields are used. However, on form validation the schema will be retrieved
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and EAV fields dynamically added to the form, so when the validation is
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actually done, all EAV fields are present in it (unless Rubric is not defined).
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"""
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FIELD_CLASSES = {
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'text': CharField,
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'float': FloatField,
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'int': IntegerField,
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'date': DateTimeField,
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'bool': BooleanField,
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'enum': ChoiceField,
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}
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def __init__(self, data=None, *args, **kwargs):
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super(BaseDynamicEntityForm, self).__init__(data, *args, **kwargs)
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config_cls = self.instance._eav_config_cls
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self.entity = getattr(self.instance, config_cls.eav_attr)
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self._build_dynamic_fields()
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def _build_dynamic_fields(self):
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# reset form fields
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self.fields = deepcopy(self.base_fields)
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for attribute in self.entity.get_all_attributes():
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value = getattr(self.entity, attribute.slug)
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defaults = {
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'label': attribute.name.capitalize(),
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'required': attribute.required,
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'help_text': attribute.help_text,
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'validators': attribute.get_validators()
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}
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datatype = attribute.datatype
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if datatype == attribute.TYPE_ENUM:
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enums = attribute.get_choices() \
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.values_list('id', 'value')
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choices = [('', '-----')] + list(enums)
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defaults.update({'choices': choices})
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if value:
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defaults.update({'initial': value.pk})
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elif datatype == attribute.TYPE_DATE:
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defaults.update({'widget': AdminSplitDateTime})
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elif datatype == attribute.TYPE_OBJECT:
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continue
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MappedField = self.FIELD_CLASSES[datatype]
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self.fields[attribute.slug] = MappedField(**defaults)
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# fill initial data (if attribute was already defined)
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if value and not datatype == attribute.TYPE_ENUM: # m2m is already done above
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self.initial[attribute.slug] = value
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def save(self, commit=True):
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"""
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Saves this ``form``'s cleaned_data into model instance ``self.instance``
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and related EAV attributes.
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Returns ``instance``.
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"""
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if self.errors:
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raise ValueError("The %s could not be saved because the data didn't"
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" validate." % self.instance._meta.object_name)
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# create entity instance, don't save yet
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instance = super(BaseDynamicEntityForm, self).save(commit=False)
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# assign attributes
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for attribute in self.entity.get_all_attributes():
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value = self.cleaned_data.get(attribute.slug)
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if attribute.datatype == attribute.TYPE_ENUM:
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if value:
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value = attribute.enum_group.enums.get(pk=value)
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else:
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value = None
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setattr(self.entity, attribute.slug, value)
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# save entity and its attributes
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if commit:
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instance.save()
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return instance
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