Bug in generated query with edge pointing back to same Node

[na-ka-na]

Example Node

class Extension(StructuredNode):
    extension = RelationshipTo('Extension', 'extension', cardinality=ZeroOrMore)

Now the query is:

n = ... # node of type Extension
for ne in n.extension.all():
   pass 

The n.extension.all() produces invalid query string as follows:

MATCH (extension) WHERE id(extension)=12796 WITH extension MATCH ((extension)-[r1:extension]->(extension:Extension)) RETURN extension

The correct query should be something like the below (see the different match variable extension1)

MATCH (extension) WHERE id(extension)=12796 WITH extension MATCH ((extension)-[r1:extension]->(extension1:Extension)) RETURN extension1

This took me quite a while to figure out since it was buried under layers of logic and also because of this #588