Accompanying code for my talk at the NODES 2022 conference titled: "Building a Python/Neo4j OGM".

Each folder can be seen as a new "branch", where features are added incrementally.

pip install -r requirements.txt export PYTHONPATH=.$PYTHONPATH pytest <dir>/tests.py 

 pytest 00-movie-creation/tests.py pytest 01-node-class/tests.py pytest 02-property-attributes/tests.py pytest 03-manager-match/tests.py pytest 04-relationship-property-fetch-and-cache/tests.py pytest 05-prefetch/tests.py 

• 00-movie-creation: movie class and hard-coded CREATE statement
• 01-node-class: Property and Node (w/ metaclass) => all subclasses of the Node class now have a _properties attribute with a list of properties they accept
• 02-property-attributes: define a Property as required (NB: skipped during the talk)
• 03-manager-match: dynamically build MATCH clause, RETURN statement, object hydration from DB
• 04-relationship-property-fetch-and-cache: define RelationshipProperty and ability to fetch the data when the field is accessed (ie when using movie.actors for instance)
• 05-prefetch: ability to prefetch related object during the MATCH query thanks to Cypher map projection

MATCH (node:Movie {title: "Cloud Atlas"}) RETURN node { .* } MATCH (node:Movie {title: "Cloud Atlas"}) RETURN node { .title, _id: id(node) } MATCH (node:Movie {title: "Cloud Atlas"}) RETURN node { .title, actors: [(node)<-[:ACTED_IN]-(person:Person) | person { .name } ] } MATCH (node:Movie {title: "Cloud Atlas"}) RETURN node { .title, actors: [ (node)<-[:ACTED_IN]-(person:Person) | person { .name, directed: [ (person)-[:DIRECTED]->(directed:Movie) | directed { .* } ] } ] } 

The code presented here is a simplified version extracted from this project: pentaquark