Fix SQLAlchemy support with ORM

Pipfile

@@ -21,6 +21,7 @@ email-validator = "*"
 ujson = "*"
 flake8 = "*"
 python-multipart = "*"
+sqlalchemy = "*"
 
 [packages]
 starlette = "==0.10.1"

docs/src/sql_databases/tutorial001.py

@@ -1,13 +1,15 @@
 from fastapi import FastAPI
-
 from sqlalchemy import Boolean, Column, Integer, String, create_engine
 from sqlalchemy.ext.declarative import declarative_base, declared_attr
 from sqlalchemy.orm import scoped_session, sessionmaker
 
 # SQLAlchemy specific code, as with any other app
-SQLALCHEMY_DATABASE_URI = "postgresql://user:password@postgresserver/db"
+SQLALCHEMY_DATABASE_URI = "sqlite:///./test.db"
+# SQLALCHEMY_DATABASE_URI = "postgresql://user:password@postgresserver/db"
 
-engine = create_engine(SQLALCHEMY_DATABASE_URI, convert_unicode=True)
+engine = create_engine(
+    SQLALCHEMY_DATABASE_URI, connect_args={"check_same_thread": False}
+)
 db_session = scoped_session(
     sessionmaker(autocommit=False, autoflush=False, bind=engine)
 )
@@ -30,15 +32,25 @@ class User(Base):
     is_active = Column(Boolean(), default=True)
 
 
-def get_user(username, db_session):
-    return db_session.query(User).filter(User.id == username).first()
+Base.metadata.create_all(bind=engine)
+
+first_user = db_session.query(User).first()
+if not first_user:
+    u = User(email="johndoe@example.com", hashed_password="notreallyhashed")
+    db_session.add(u)
+    db_session.commit()
+
+
+# Utility
+def get_user(db_session, user_id: int):
+    return db_session.query(User).filter(User.id == user_id).first()
 
 
 # FastAPI specific code
 app = FastAPI()
 
 
-@app.get("/users/{username}")
-def read_user(username: str):
-    user = get_user(username, db_session)
+@app.get("/users/{user_id}")
+def read_user(user_id: int):
+    user = get_user(db_session, user_id=user_id)
     return user