On 06/19/2017 08:29 PM, Van Klaveren, Brian N. wrote:
Hi,
I want to represent a One to Many relationship with an additional default value
that depends on a value in the foreign table.
I think what I want is something like the following:
class UserDatabase(Base):
db_id = Column(Integer, primary_key=True)
repo_id = Column(Integer, ForeignKey("UserDatabase.db_id"), nullable=True)
name = Column(String(128))
description = Column(Text)
conn_host = Column(String(128))
conn_port = Column(Integer)
schemas = relationship("UserDatabaseSchema", lazy="dynamic")
# Where is_default_schema == True
default_schema = relationship("UserDatabaseSchema", primaryjoin=???,
lazy="dynamic")
class UserDatabaseSchema(Base):
schema_id = Column(Integer, primary_key=True)
db_id = Column(Integer, ForeignKey("UserDatabase.db_id"))
name = Column(String(128))
description = Column(Text)
is_default_schema = Column(Boolean)
but I'm not sure if primaryjoin is the proper argument for relationship and, if
it is, what the expression should be. Or is this something that's best handled
a different way?
you'd use primaryjoin for that and for examples see
http://docs.sqlalchemy.org/en/rel_1_1/orm/join_conditions.html#specifying-alternate-join-conditions
Thanks,
Brian
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