Fragments and views

Map a node with a NodeFragment, and compose fragments and relationships into a GraphView, which loads in one statement:

from typing import Annotated

from drivine import GraphView, NodeFragment, NodeId, Relationship, RelationshipFragment, Root, TargetNode


class Person(NodeFragment, labels=["Person"]):
    uuid: Annotated[str, NodeId()]
    name: str
    bio: str | None = None


class Organization(NodeFragment, labels=["Organization"]):
    uuid: Annotated[str, NodeId()]
    name: str


class WorkHistory(RelationshipFragment):     # a relationship's properties, and the node it leads to
    start_date: str
    role: str
    target: Annotated[Organization, TargetNode()]


class PersonCareer(GraphView):
    person: Annotated[Person, Root()]
    employment_history: Annotated[list[WorkHistory], Relationship("WORKS_FOR")] = []

gom = drivine.graph_object_manager()        # from DrivineAssembly, or StatelessGraphObjectManager(pm)

career = await gom.load(PersonCareer, uuid)
leads = await gom.load_all(PersonCareer, "n.bio CONTAINS $text", {"text": "Lead"})   # Cypher over the root, n
total = await gom.count(Person)