Question

我正在努力应对以下映射。我的意图是拥有一个myobject-class，其中包含父对象列表（相同类型）和子对象列表（也是对象类型）。经过大量搜索，我找到了用于多对多或自引用的示例，但没有一个答案符合我的需求。这是我现在拥有的：

class ObjectDependency():
Id = Column("OBJ_DEPENDENCY_ID", BigInteger(), primary_key = True)

_childobjectid  = Column("CHILD_OBJECT_ID"
                , BigInteger()
                , ForeignKey(MyObject.Id)
                )

ChildObject = relationship(MyObject, foreign_keys = [_childobjectid])

_parentobjectid  = Column("PARENT_OBJECT_ID"
                , BigInteger()
                , ForeignKey(MyObject.Id)
                )

ParentObject = relationship(MyObject, foreign_keys = [_parentobjectid])

class MyObject():

Id = Column("OBJECT_ID", BigInteger(), primary_key = True)
#..other columns
ParentObjectDependencies = relationship("ObjectDependency"
                                     , back_populates = "ParentObject"
                                     , foreign_keys = "ObjectDependency._childobjectid"
                                     )

ChildObjectDependencies = relationship("ObjectDependency"
                                    , back_populates = "ChildObject"
                                    , foreign_keys = "ObjectDependency._parentobjectid"
                                    )

ParentDependencyObjects = association_proxy("ParentObjectDependencies", "ParentObject")

ChildDependencyObjects = association_proxy("ChildObjectDependencies", "ChildObject")

如果我做这样的事情，它也不会抛出错误：

obj1.ChildObjectDependencies.append(obj2)

它还将我的关联对象写入数据库，但是这些值没有意义。在数据库中，obj1通过我的Dependency对象引用obj2。我如何使我的关系正常运转？

SQLAlchemy自引用多对多映射（父子级）

0 个答案: