On Wed, May 29, 2019 at 10:08 AM Desmond Lim <limwen...@gmail.com> wrote:
>
> Hi there,
>
> I'm been puzzling over this and still can't find answer.
>
> I have 2 tables:
>
> Nodes:
>
> class NodesModel(db.Model):
> __tablename__ = 'nodes'
>
> id = db.Column(db.BigInteger, primary_key=True)
> project_uuid = db.Column(UUID(as_uuid=True),
> db.ForeignKey('projects.uuid'))
> name = db.Column(db.String(50), nullable=False)
> size = db.Column(db.Integer, nullable=False)
>
> posts_nodes = relationship("PostsNodesModel", backref="nodes")
> relationships = relationship("RelationshipsModel", backref="nodes")
>
> Relationships:
>
> class RelationshipsModel(db.Model):
> __tablename__ = 'relationships'
>
> source_node_id = db.Column(db.BigInteger, db.ForeignKey('nodes.id'),
> primary_key=True)
> target_node_id = db.Column(db.BigInteger, db.ForeignKey('nodes.id'),
> primary_key=True)
> strength = db.Column(db.Integer, nullable=False)
>
> I'm getting errors on this line:
>
> relationships = relationship("RelationshipsModel", backref="nodes")
>
> And I know it is because my Relationships table has the Nodes table as a
> foreign key twice. But I have not idea how do I create 2 relationships to the
> Relationships table?
>
I assume the error you are getting is something like "Could not
determine join condition..."? In which case, you probably need this
section of the docs:
https://docs.sqlalchemy.org/en/13/orm/join_conditions.html#handling-multiple-join-paths
Hope that helps,
Simon
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