70 lines
3.1 KiB
Python
70 lines
3.1 KiB
Python
from django.utils.encoding import smart_unicode
|
|
from django.db.models.fields import BLANK_CHOICE_DASH
|
|
|
|
class BoundRelatedObject(object):
|
|
def __init__(self, related_object, field_mapping, original):
|
|
self.relation = related_object
|
|
self.field_mappings = field_mapping[related_object.name]
|
|
|
|
def template_name(self):
|
|
raise NotImplementedError
|
|
|
|
def __repr__(self):
|
|
return repr(self.__dict__)
|
|
|
|
class RelatedObject(object):
|
|
def __init__(self, parent_model, model, field):
|
|
self.parent_model = parent_model
|
|
self.model = model
|
|
self.opts = model._meta
|
|
self.field = field
|
|
self.name = '%s:%s' % (self.opts.app_label, self.opts.module_name)
|
|
self.var_name = self.opts.object_name.lower()
|
|
|
|
def get_choices(self, include_blank=True, blank_choice=BLANK_CHOICE_DASH,
|
|
limit_to_currently_related=False):
|
|
"""Returns choices with a default blank choices included, for use
|
|
as SelectField choices for this field.
|
|
|
|
Analogue of django.db.models.fields.Field.get_choices, provided
|
|
initially for utilisation by RelatedFieldListFilter.
|
|
"""
|
|
first_choice = include_blank and blank_choice or []
|
|
queryset = self.model._default_manager.all()
|
|
if limit_to_currently_related:
|
|
queryset = queryset.complex_filter(
|
|
{'%s__isnull' % self.parent_model._meta.module_name: False})
|
|
lst = [(x._get_pk_val(), smart_unicode(x)) for x in queryset]
|
|
return first_choice + lst
|
|
|
|
def get_db_prep_lookup(self, lookup_type, value, connection, prepared=False):
|
|
# Defer to the actual field definition for db prep
|
|
return self.field.get_db_prep_lookup(lookup_type, value,
|
|
connection=connection, prepared=prepared)
|
|
|
|
def editable_fields(self):
|
|
"Get the fields in this class that should be edited inline."
|
|
return [f for f in self.opts.fields + self.opts.many_to_many if f.editable and f != self.field]
|
|
|
|
def __repr__(self):
|
|
return "<RelatedObject: %s related to %s>" % (self.name, self.field.name)
|
|
|
|
def bind(self, field_mapping, original, bound_related_object_class=BoundRelatedObject):
|
|
return bound_related_object_class(self, field_mapping, original)
|
|
|
|
def get_accessor_name(self):
|
|
# This method encapsulates the logic that decides what name to give an
|
|
# accessor descriptor that retrieves related many-to-one or
|
|
# many-to-many objects. It uses the lower-cased object_name + "_set",
|
|
# but this can be overridden with the "related_name" option.
|
|
if self.field.rel.multiple:
|
|
# If this is a symmetrical m2m relation on self, there is no reverse accessor.
|
|
if getattr(self.field.rel, 'symmetrical', False) and self.model == self.parent_model:
|
|
return None
|
|
return self.field.rel.related_name or (self.opts.object_name.lower() + '_set')
|
|
else:
|
|
return self.field.rel.related_name or (self.opts.object_name.lower())
|
|
|
|
def get_cache_name(self):
|
|
return "_%s_cache" % self.get_accessor_name()
|