When I add the relationship below it displays the relationship list without 
issuing a commit.

>>> session.add(Relationship(source=george, target=martha, 
relationship_type=marriage))
>>> george.relationships
[<Relationship "Washington, George & Washington, Martha (Marriage)">]

But when I add this relationship it returns an empty list unless I issue a 
session.commit() somwhere
between george.relationship and martha.relationships.  Why do they not 
behave the same?

>>> session.add(Relationship(source=martha, target=george, 
relationship_type=marriage))
>>> martha.relationships
[]

>>> session.commit()
[<Relationship "Washington, Martha & Washington, George (Marriage)">]

Thanks in advance.

Mats

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