Neo4j Python Driver Using Unwind with a list of dictionaries

I’m trying to batch merge to create multiple nodes. Using the below code,

def test_batches(tx,user_batch):
            result= tx.run(f"Unwind {user_batch} as user
                           MERGE (n:User {{id: user.id, name: user.name, username: user.username }})")

However I am getting this error. Note I’m passing in a list of dictionaries.

CypherSyntaxError: {code: Neo.ClientError.Statement.SyntaxError} {message: Invalid input '[': expected "+" or "-" (line 1, column 8 (offset: 7))
"Unwind [{'id': 1596859520977969156, 'name': 'Bigspuds', 'username': 'bigspuds777'}, {'id': 1596860505662144513, 'name': 'JOHN VIEIRA', 'username': 'JOHNVIE67080352'}, {'id': 1596860610905448449, 'name': 'biru nkumat', 'username': 'NkumatB'}, {'id': 1513497734711738374, 'name': 'elfiranda Hakim', 'username': 'Kidonk182'}, {'id': 1596836234860859392, 'name': 'Ecat Miao', 'username': 'sylvanasMa'}] as user                           MERGE (n:User {id: user.id, name: user.name, username: user.username })"
        ^}

I have no idea why this is happening any help is greatly appreciated.

Answer

Below is a working code on using UNWIND for a list of dictionaries. Please note that is it recommended to pass the value as a parameter rather than working on the value string in query.

from neo4j import GraphDatabase

uri = "neo4j://localhost:7687"
driver = GraphDatabase.driver(uri, auth=("neo4j", "awesomepassword"))

def test_batches(tx, user_batch):
    tx.run("UNWIND $user_batch as user 
            MERGE (n:User {id: user.id, name: user.name, username: user.username})", user_batch=user_batch)
    
with driver.session() as session:
    user_batch = [
                 {'id': 1596859520977969156, 'name': 'Bigspuds', 'username': 'bigspuds777'}, 
                 {'id': 1596860505662144513, 'name': 'JOHN VIEIRA', 'username': 'JOHNVIE67080352'}, 
                 {'id': 1596860610905448449, 'name': 'biru nkumat', 'username': 'NkumatB'}, 
                 {'id': 1513497734711738374, 'name': 'elfiranda Hakim', 'username': 'Kidonk182'}, 
                 {'id': 1596836234860859392, 'name': 'Ecat Miao', 'username': 'sylvanasMa'}]
    session.write_transaction(test_batches, user_batch) 

driver.close()

sample result: