-from django import forms
-from django.contrib import admin
-from philo.contrib.cowell.fields import ForeignKeyAttribute, ManyToManyAttribute
-from philo.contrib.cowell.forms import ProxyFieldForm, proxy_fields_for_entity_model
-from philo.contrib.cowell.widgets import ForeignKeyAttributeRawIdWidget, ManyToManyAttributeRawIdWidget
-from philo.admin import EntityAdmin
-
-
-def hide_proxy_fields(hidden, attrs, attname, attvalue, proxy_fields):
- attvalue = set(attvalue)
- proxy_fields = set(proxy_fields)
- if proxy_fields & attvalue:
- hidden[attname] = list(attvalue)
- attrs[attname] = list(attvalue - proxy_fields)
-
-
-class ProxyFieldAdminMetaclass(EntityAdmin.__metaclass__):
- def __new__(cls, name, bases, attrs):
- # HACK to bypass model validation for proxy fields by masking them as readonly fields
- form = attrs.get('form')
- if form:
- opts = form._meta
- if issubclass(form, ProxyFieldForm) and opts.model:
- proxy_fields = proxy_fields_for_entity_model(opts.model).keys()
- readonly_fields = attrs.pop('readonly_fields', ())
- cls._real_readonly_fields = readonly_fields
- attrs['readonly_fields'] = list(readonly_fields) + proxy_fields
-
- # Additional HACKS to handle raw_id_fields and other attributes that the admin
- # uses model._meta.get_field to validate.
- hidden_attributes = {}
- hide_proxy_fields(hidden_attributes, attrs, 'raw_id_fields', attrs.pop('raw_id_fields', ()), proxy_fields)
- attrs['_hidden_attributes'] = hidden_attributes
- #END HACK
- return EntityAdmin.__metaclass__.__new__(cls, name, bases, attrs)
-
-
-class ProxyFieldAdmin(EntityAdmin):
- __metaclass__ = ProxyFieldAdminMetaclass
- #form = ProxyFieldForm
-
- def __init__(self, *args, **kwargs):
- # HACK PART 2 restores the actual readonly fields etc. on __init__.
- self.readonly_fields = self.__class__._real_readonly_fields
- if hasattr(self, '_hidden_attributes'):
- for name, value in self._hidden_attributes.items():
- setattr(self, name, value)
- # END HACK
- super(ProxyFieldAdmin, self).__init__(*args, **kwargs)
-
- def formfield_for_dbfield(self, db_field, **kwargs):
- """
- Override the default behavior to provide special formfields for EntityProxyFields.
- Essentially clones the ForeignKey/ManyToManyField special behavior for the Attribute versions.
- """
- if not db_field.choices and isinstance(db_field, (ForeignKeyAttribute, ManyToManyAttribute)):
- request = kwargs.pop("request", None)
- # Combine the field kwargs with any options for formfield_overrides.
- # Make sure the passed in **kwargs override anything in
- # formfield_overrides because **kwargs is more specific, and should
- # always win.
- if db_field.__class__ in self.formfield_overrides:
- kwargs = dict(self.formfield_overrides[db_field.__class__], **kwargs)
-
- # Get the correct formfield.
- if isinstance(db_field, ManyToManyAttribute):
- formfield = self.formfield_for_manytomanyattribute(db_field, request, **kwargs)
- elif isinstance(db_field, ForeignKeyAttribute):
- formfield = self.formfield_for_foreignkeyattribute(db_field, request, **kwargs)
-
- # For non-raw_id fields, wrap the widget with a wrapper that adds
- # extra HTML -- the "add other" interface -- to the end of the
- # rendered output. formfield can be None if it came from a
- # OneToOneField with parent_link=True or a M2M intermediary.
- # TODO: Implement this.
- #if formfield and db_field.name not in self.raw_id_fields:
- # formfield.widget = admin.widgets.RelatedFieldWidgetWrapper(formfield.widget, db_field, self.admin_site)
-
- return formfield
- return super(ProxyFieldAdmin, self).formfield_for_dbfield(db_field, **kwargs)
-
- def formfield_for_foreignkeyattribute(self, db_field, request=None, **kwargs):
- """Get a form field for a ForeignKeyAttribute field."""
- db = kwargs.get('using')
- if db_field.name in self.raw_id_fields:
- kwargs['widget'] = ForeignKeyAttributeRawIdWidget(db_field, db)
- #TODO: Add support for radio fields
- #elif db_field.name in self.radio_fields:
- # kwargs['widget'] = widgets.AdminRadioSelect(attrs={
- # 'class': get_ul_class(self.radio_fields[db_field.name]),
- # })
- # kwargs['empty_label'] = db_field.blank and _('None') or None
-
- return db_field.formfield(**kwargs)
-
- def formfield_for_manytomanyattribute(self, db_field, request=None, **kwargs):
- """Get a form field for a ManyToManyAttribute field."""
- db = kwargs.get('using')
-
- if db_field.name in self.raw_id_fields:
- kwargs['widget'] = ManyToManyAttributeRawIdWidget(db_field, using=db)
- kwargs['help_text'] = ''
- #TODO: Add support for filtered fields.
- #elif db_field.name in (list(self.filter_vertical) + list(self.filter_horizontal)):
- # kwargs['widget'] = widgets.FilteredSelectMultiple(db_field.verbose_name, (db_field.name in self.filter_vertical))
-
- return db_field.formfield(**kwargs)
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