Complete OAuth2 documentation

docs/src/db_sqlalchemy_oauth.py

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+import databases
+import sqlalchemy
+from fastapi_users.db import (
+    SQLAlchemyBaseOAuthAccountTable,
+    SQLAlchemyBaseUserTable,
+    SQLAlchemyUserDatabase,
+)
+from sqlalchemy.ext.declarative import DeclarativeMeta, declarative_base
+
+from .models import UserDB
+
+DATABASE_URL = "sqlite:///./test.db"
+database = databases.Database(DATABASE_URL)
+Base: DeclarativeMeta = declarative_base()
+
+
+class UserTable(Base, SQLAlchemyBaseUserTable):
+    pass
+
+
+class OAuthAccount(SQLAlchemyBaseOAuthAccountTable, Base):
+    pass
+
+
+engine = sqlalchemy.create_engine(
+    DATABASE_URL, connect_args={"check_same_thread": False}
+)
+Base.metadata.create_all(engine)
+
+users = UserTable.__table__
+oauth_accounts = OAuthAccount.__table__
+
+
+def get_user_db():
+    yield SQLAlchemyUserDatabase(UserDB, database, users, oauth_accounts)