philo/admin/base.py

   1 from django.conf import settings
   2 from django.contrib import admin
   3 from django.contrib.contenttypes import generic
   4 from django.http import HttpResponse
   5 from django.utils import simplejson as json
   6 from django.utils.html import escape
   7 from mptt.admin import MPTTModelAdmin
   8
   9 from philo.models import Attribute
  10 from philo.models.fields.entities import ForeignKeyAttribute, ManyToManyAttribute
  11 from philo.admin.forms.attributes import AttributeForm, AttributeInlineFormSet
  12 from philo.admin.widgets import TagFilteredSelectMultiple
  13 from philo.forms.entities import EntityForm, proxy_fields_for_entity_model
  14
  15
  16 COLLAPSE_CLASSES = ('collapse', 'collapse-closed', 'closed',)
  17
  18
  19 class AttributeInline(generic.GenericTabularInline):
  20         ct_field = 'entity_content_type'
  21         ct_fk_field = 'entity_object_id'
  22         model = Attribute
  23         extra = 1
  24         allow_add = True
  25         classes = COLLAPSE_CLASSES
  26         form = AttributeForm
  27         formset = AttributeInlineFormSet
  28         fields = ['key', 'value_content_type']
  29         if 'grappelli' in settings.INSTALLED_APPS:
  30                 template = 'admin/philo/edit_inline/grappelli_tabular_attribute.html'
  31         else:
  32                 template = 'admin/philo/edit_inline/tabular_attribute.html'
  33
  34
  35 # HACK to bypass model validation for proxy fields
  36 class SpoofedHiddenFields(object):
  37         def __init__(self, proxy_fields, value):
  38                 self.value = value
  39                 self.spoofed = list(set(value) - set(proxy_fields))
  40
  41         def __get__(self, instance, owner):
  42                 if instance is None:
  43                         return self.spoofed
  44                 return self.value
  45
  46
  47 class SpoofedAddedFields(SpoofedHiddenFields):
  48         def __init__(self, proxy_fields, value):
  49                 self.value = value
  50                 self.spoofed = list(set(value) | set(proxy_fields))
  51
  52
  53 def hide_proxy_fields(cls, attname):
  54         val = getattr(cls, attname, [])
  55         proxy_fields = getattr(cls, 'proxy_fields')
  56         if val:
  57                 setattr(cls, attname, SpoofedHiddenFields(proxy_fields, val))
  58
  59 def add_proxy_fields(cls, attname):
  60         val = getattr(cls, attname, [])
  61         proxy_fields = getattr(cls, 'proxy_fields')
  62         setattr(cls, attname, SpoofedAddedFields(proxy_fields, val))
  63
  64
  65 class EntityAdminMetaclass(admin.ModelAdmin.__metaclass__):
  66         def __new__(cls, name, bases, attrs):
  67                 new_class = super(EntityAdminMetaclass, cls).__new__(cls, name, bases, attrs)
  68                 hide_proxy_fields(new_class, 'raw_id_fields')
  69                 add_proxy_fields(new_class, 'readonly_fields')
  70                 return new_class
  71 # END HACK
  72
  73 class EntityAdmin(admin.ModelAdmin):
  74         __metaclass__ = EntityAdminMetaclass
  75         form = EntityForm
  76         inlines = [AttributeInline]
  77         save_on_top = True
  78         proxy_fields = []
  79
  80         def formfield_for_dbfield(self, db_field, **kwargs):
  81                 """
  82                 Override the default behavior to provide special formfields for EntityEntitys.
  83                 Essentially clones the ForeignKey/ManyToManyField special behavior for the Attribute versions.
  84                 """
  85                 if not db_field.choices and isinstance(db_field, (ForeignKeyAttribute, ManyToManyAttribute)):
  86                         request = kwargs.pop("request", None)
  87                         # Combine the field kwargs with any options for formfield_overrides.
  88                         # Make sure the passed in **kwargs override anything in
  89                         # formfield_overrides because **kwargs is more specific, and should
  90                         # always win.
  91                         if db_field.__class__ in self.formfield_overrides:
  92                                 kwargs = dict(self.formfield_overrides[db_field.__class__], **kwargs)
  93
  94                         # Get the correct formfield.
  95                         if isinstance(db_field, ManyToManyAttribute):
  96                                 formfield = self.formfield_for_manytomanyattribute(db_field, request, **kwargs)
  97                         elif isinstance(db_field, ForeignKeyAttribute):
  98                                 formfield = self.formfield_for_foreignkeyattribute(db_field, request, **kwargs)
  99
 100                         # For non-raw_id fields, wrap the widget with a wrapper that adds
 101                         # extra HTML -- the "add other" interface -- to the end of the
 102                         # rendered output. formfield can be None if it came from a
 103                         # OneToOneField with parent_link=True or a M2M intermediary.
 104                         # TODO: Implement this.
 105                         #if formfield and db_field.name not in self.raw_id_fields:
 106                         #       formfield.widget = admin.widgets.RelatedFieldWidgetWrapper(formfield.widget, db_field, self.admin_site)
 107
 108                         return formfield
 109                 return super(EntityAdmin, self).formfield_for_dbfield(db_field, **kwargs)
 110
 111         def formfield_for_foreignkeyattribute(self, db_field, request=None, **kwargs):
 112                 """Get a form field for a ForeignKeyAttribute field."""
 113                 db = kwargs.get('using')
 114                 if db_field.name in self.raw_id_fields:
 115                         kwargs['widget'] = admin.widgets.ForeignKeyRawIdWidget(db_field, db)
 116                 #TODO: Add support for radio fields
 117                 #elif db_field.name in self.radio_fields:
 118                 #       kwargs['widget'] = widgets.AdminRadioSelect(attrs={
 119                 #               'class': get_ul_class(self.radio_fields[db_field.name]),
 120                 #       })
 121                 #       kwargs['empty_label'] = db_field.blank and _('None') or None
 122
 123                 return db_field.formfield(**kwargs)
 124
 125         def formfield_for_manytomanyattribute(self, db_field, request=None, **kwargs):
 126                 """Get a form field for a ManyToManyAttribute field."""
 127                 db = kwargs.get('using')
 128
 129                 if db_field.name in self.raw_id_fields:
 130                         kwargs['widget'] = admin.widgets.ManyToManyRawIdWidget(db_field, using=db)
 131                         kwargs['help_text'] = ''
 132                 #TODO: Add support for filtered fields.
 133                 #elif db_field.name in (list(self.filter_vertical) + list(self.filter_horizontal)):
 134                 #       kwargs['widget'] = widgets.FilteredSelectMultiple(db_field.verbose_name, (db_field.name in self.filter_vertical))
 135
 136                 return db_field.formfield(**kwargs)
 137
 138
 139 class TreeEntityAdmin(EntityAdmin, MPTTModelAdmin):
 140         pass