Hello everyone!
I have an application with Users and UserGroups... The users have
certain permissions to do stuff in the application depending on the
UserGroup they belong to. The relationship is as follows:
--------------------------------------
class User(BaseClass.BaseClass, Database.Base):
__tablename__ = "users"
_firstName = Column("first_name", String(50), key="fistName")
_lastName = Column("last_name", String(50), key="lastName")
_userName = Column("user_name", String(50), unique=True, nullable=False)
_password = Column("password", String(64), nullable=False)
_userGroupId = Column("user_group_id", Integer,
ForeignKey("user_groups.id"), key="userGroupId")
_userGroup = relationship("UserGroup", uselist=False,
backref=backref("_users",
collection_class=set
))
class UserGroup(BaseClass.BaseClass, Database.Base):
"""Represents a group of users with the same features"""
__tablename__ = "user_groups"
_name = Column("name", String(50))
_permissions = Column("attach_posts",
CharSeparatedStrings.CharSeparatedStrings(), key="attachPosts")
#_users: Backref from User
--------------------------------------
Let's say an administrator unassigns a user "i.e.: john" from its
UserGroup. I don't want to delete "john" from the system, but I want
to execute a method when it becomes "orphan" of user group (mainly to
remove all the permissions "john" has). Is that possible? Something
like:
_userGroup = relationship("UserGroup", uselist=False,
backref=backref("_users",
collection_class=set,
on_orphan=function_to_remove_permissions()
))
Thank you in advance!
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