django.db.models.query_utils.DeferredAttribute

class documentation

class DeferredAttribute: (source)

Known subclasses: django.contrib.gis.db.models.proxy.SpatialProxy, django.db.models.fields.files.FileDescriptor, django.db.models.fields.related_descriptors.ForeignKeyDeferredAttribute

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A wrapper for a deferred-loading field. When the value is read from this object the first time, the query is executed.

Method	`__get__`	Retrieve and caches the value from the datastore on the first lookup. Return the cached value.
Method	`__init__`	Undocumented
Instance Variable	`field`	Undocumented
Method	`_check_parent_chain`	Check if the field value can be fetched from a parent field already loaded in the instance. This can be done if the to-be fetched field is a primary key field.

def __get__(self, instance, cls=None): (source) ¶

overridden in django.contrib.gis.db.models.proxy.SpatialProxy, django.db.models.fields.files.FileDescriptor

Retrieve and caches the value from the datastore on the first lookup. Return the cached value.

def __init__(self, field): (source) ¶

overridden in django.contrib.gis.db.models.proxy.SpatialProxy

Undocumented

field = (source) ¶

Undocumented

def _check_parent_chain(self, instance): (source) ¶

Check if the field value can be fetched from a parent field already loaded in the instance. This can be done if the to-be fetched field is a primary key field.