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builtins.object TypingOnly builtins.object Generic _MappedAnnotationBase DynamicMapped
class DynamicMapped(_MappedAnnotationBase):
Represent the ORM mapped attribute type for a "dynamic" relationship.
The :class:`_orm.DynamicMapped` type annotation may be used in an
:ref:`Annotated Declarative Table <orm_declarative_mapped_column>` mapping
to indicate that the ``lazy="dynamic"`` loader strategy should be used
for a particular :func:`_orm.relationship`.
.. legacy:: The "dynamic" lazy loader strategy is the legacy form of what
is now the "write_only" strategy described in the section
:ref:`write_only_relationship`.
E.g.::
class User(Base):
__tablename__ = "user"
id: Mapped[int] = mapped_column(primary_key=True)
addresses: DynamicMapped[Address] = relationship(
cascade="all,delete-orphan"
)
See the section :ref:`dynamic_relationship` for background.
.. versionadded:: 2.0
.. seealso::
:ref:`dynamic_relationship` - complete background
:class:`.WriteOnlyMapped` - fully 2.0 style version
| Signature du constructeur | Description |
|---|---|
| __init__(self, /, *args, **kwargs) | Initialize self. See help(type(self)) for accurate signature. [extrait de __init__.__doc__] |
| Signature de la méthode | Description |
|---|---|
| __class_getitem__ | Parameterizes a generic class. [extrait de __class_getitem__.__doc__] |
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