init commit

backend/app/models/user.py

@@ -0,0 +1,38 @@
+from sqlalchemy import BigInteger
+from sqlalchemy import Column
+from sqlmodel import create_engine
+from sqlmodel import Field
+from sqlmodel import Relationship
+from sqlmodel import Session
+from sqlmodel import SQLModel
+
+from app.core.config import config
+
+from .links import ItemUserLink
+
+
+class User(SQLModel, table=True):
+    id: int = Field(sa_column=Column(BigInteger(), primary_key=True))
+    username: str = Field(nullable=False)
+    events: list['Event'] = Relationship(back_populates='users')
+    items: list['Item'] = Relationship(
+        back_populates='assigned_to', link_model=ItemUserLink
+    )
+    transactions: list['Transaction'] = Relationship(back_populates='payer')
+
+    async def get_or_create_user(self):
+        engine = create_engine(url=config.DATABASE_URL)
+        with Session(engine) as session:
+            user = session.get(User, self.id)
+
+            if not user:
+                user = User(
+                    id=self.id,
+                    username=self.username,
+                )
+                session.add(user)
+                session.commit()
+
+            session.refresh(user)
+
+            return user