Class OneToOneField

django.db.models.fields.related.OneToOneField

A OneToOneField is essentially the same as a ForeignKey, with the exception

Declaration

class OneToOneField(ForeignKey)

Documentation

that it always carries a "unique" constraint with it and the reverse
relation always returns the object pointed to (since there will only ever
be one), rather than returning a list.

Methods

▶ def __init__(self, to, on_delete, to_field=None, **kwargs) override
source link
This method overrides django.db.models.fields.related.ForeignKey.__init__.

▶ def deconstruct(self) override

inherited doc Return enough information to recreate the field as a 4-tuple:

source link

This method overrides django.db.models.fields.related.ForeignKey.deconstruct.

* The name of the field on the model, if contribute_to_class() has
   been run.
 * The import path of the field, including the class:e.g.
   django.db.models.IntegerField This should be the most portable
   version, so less specific may be better.
 * A list of positional arguments.
 * A dict of keyword arguments.

Note that the positional or keyword arguments must contain values of
the following types (including inner values of collection types):

 * None, bool, str, int, float, complex, set, frozenset, list, tuple,
   dict
 * UUID
 * datetime.datetime (naive), datetime.date
 * top-level classes, top-level functions - will be referenced by their
   full import path
 * Storage instances - these have their own deconstruct() method

This is because the values here must be serialized into a text format
(possibly new Python code, possibly JSON) and these are the only types
with encoding handlers defined.

There's no need to return the exact way the field was instantiated this
time, just ensure that the resulting field is the same - prefer keyword
arguments over positional ones, and omit parameters with their default
values.

▶ def formfield(self, **kwargs) override
inherited doc Pass ``limit_choices_to`` to the field being constructed.
source link
This method overrides django.db.models.fields.related.ForeignKey.formfield.
```
Only passes it if there is a type that supports related fields.
This is a similar strategy used to pass the ``queryset`` to the field
being constructed.
```
▶ def save_form_data(self, instance, data) override
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This method overrides django.db.models.fields.Field.save_form_data.

Inherited methods

Methods inherited from django.db.models.fields.related.ForeignKey:
check, contribute_to_related_class, convert_empty_strings, db_check, db_parameters, db_type, get_attname, get_attname_column, get_col, get_db_converters, get_db_prep_save, get_db_prep_value, get_default, get_prep_value, get_reverse_path_info, resolve_related_fields, target_field, to_python, validate
Methods inherited from django.db.models.fields.related.ForeignObject:
contribute_to_class, foreign_related_fields, get_extra_descriptor_filter, get_extra_restriction, get_foreign_related_value, get_instance_value_for_fields, get_joining_columns, get_local_related_value, get_lookups, get_path_info, get_reverse_joining_columns, local_related_fields, related_fields, reverse_related_fields
Methods inherited from django.db.models.fields.related.RelatedField:
do_related_class, get_cache_name, get_forward_related_filter, get_limit_choices_to, get_reverse_related_filter, related_model, related_query_name, set_attributes_from_rel, swappable_setting
Methods inherited from django.db.models.fields.mixins.FieldCacheMixin:
delete_cached_value, get_cached_value, is_cached, set_cached_value
Methods inherited from django.db.models.fields.Field:
__copy__, __deepcopy__, __eq__, __hash__, __lt__, __reduce__, __repr__, __str__, cached_col, cast_db_type, clean, clone, db_returning, db_tablespace, db_type_parameters, db_type_suffix, get_choices, get_filter_kwargs_for_object, get_internal_type, get_pk_value_on_save, has_default, pre_save, rel_db_type, run_validators, select_format, set_attributes_from_name, unique, validators, value_from_object, value_to_string
Methods inherited from django.db.models.query_utils.RegisterLookupMixin:
get_lookup, get_transform, merge_dicts, register_lookup

Reexports