Neo4j Python Driver: Pass nodes as parameter to DB

i want create a new edge between two nodes using the python driver for neo4j.

def cypher_orchestration(tx, start_identifier: str, end_identifier:str, edge_type: str):
    start_node = node_match(tx, start_identifier).single()
    end_node = node_match(tx, end_identifier).single()
    edge = create_edge(tx, start_node, edge_type, end_node)

I created the function "node_match" and can successfully receive the searched nodes.
But now i have problems with creating a edge between both nodes.

What i did, is creating the "create_edge" function which looks like this:

from neo4j.graph import Node

def create_edge(tx, start_node: Node, edge_type: str, end_node: Node):
    result = tx.run(f"""
        CALL apoc.merge.relationship($start_node, $edge_type, {{}}, $end_node, {{}}) yield rel
        return rel
        """, start_node=start_node, edge_type=edge_type, end_node=end_node)
    return result

Unfortunately i don't understand, how to pass a node which was queried before as parameter to a query. How can i pass a Node Object to neo4j? Is this even possible?

I also know, that i could match both nodes again in my "create edge" function but i believe (and hope) that there must be a more... more elegant way. If someone knows how to archieve this or knows a similar way, i would be happy to learn from you

Thanks for your help!
Greetings, ottonormal

You cannot pass node or relationship objects as query parameters.

In the case of apoc.merge.relationship, the start and end node are defined within the Cypher query itself. It looks like:

MATCH (start:SomeLabel {some: "property"})
MATCH (end:SomeOtherLabel {some-other: "property"})
CALL apoc.merge.relationship(start, "SOME_REL_TYPE", {}, {}, end, {}) YIELD rel
RETURN rel