♻️ Edit refactor db models to use UUID's instead of integer ID's (#1259)

Co-authored-by: Sebastián Ramírez <tiangolo@gmail.com>

backend/app/alembic/versions/d98dd8ec85a3_edit_replace_id_integers_in_all_models_.py

@@ -0,0 +1,90 @@
+"""Edit replace id integers in all models to use UUID instead
+
+Revision ID: d98dd8ec85a3
+Revises: 9c0a54914c78
+Create Date: 2024-07-19 04:08:04.000976
+
+"""
+from alembic import op
+import sqlalchemy as sa
+import sqlmodel.sql.sqltypes
+from sqlalchemy.dialects import postgresql
+
+
+# revision identifiers, used by Alembic.
+revision = 'd98dd8ec85a3'
+down_revision = '9c0a54914c78'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # Ensure uuid-ossp extension is available
+    op.execute('CREATE EXTENSION IF NOT EXISTS "uuid-ossp"')
+
+    # Create a new UUID column with a default UUID value
+    op.add_column('user', sa.Column('new_id', postgresql.UUID(as_uuid=True), default=sa.text('uuid_generate_v4()')))
+    op.add_column('item', sa.Column('new_id', postgresql.UUID(as_uuid=True), default=sa.text('uuid_generate_v4()')))
+    op.add_column('item', sa.Column('new_owner_id', postgresql.UUID(as_uuid=True), nullable=True))
+
+    # Populate the new columns with UUIDs
+    op.execute('UPDATE "user" SET new_id = uuid_generate_v4()')
+    op.execute('UPDATE item SET new_id = uuid_generate_v4()')
+    op.execute('UPDATE item SET new_owner_id = (SELECT new_id FROM "user" WHERE "user".id = item.owner_id)')
+
+    # Set the new_id as not nullable
+    op.alter_column('user', 'new_id', nullable=False)
+    op.alter_column('item', 'new_id', nullable=False)
+
+    # Drop old columns and rename new columns
+    op.drop_constraint('item_owner_id_fkey', 'item', type_='foreignkey')
+    op.drop_column('item', 'owner_id')
+    op.alter_column('item', 'new_owner_id', new_column_name='owner_id')
+
+    op.drop_column('user', 'id')
+    op.alter_column('user', 'new_id', new_column_name='id')
+
+    op.drop_column('item', 'id')
+    op.alter_column('item', 'new_id', new_column_name='id')
+
+    # Create primary key constraint
+    op.create_primary_key('user_pkey', 'user', ['id'])
+    op.create_primary_key('item_pkey', 'item', ['id'])
+
+    # Recreate foreign key constraint
+    op.create_foreign_key('item_owner_id_fkey', 'item', 'user', ['owner_id'], ['id'])
+
+def downgrade():
+    # Reverse the upgrade process
+    op.add_column('user', sa.Column('old_id', sa.Integer, autoincrement=True))
+    op.add_column('item', sa.Column('old_id', sa.Integer, autoincrement=True))
+    op.add_column('item', sa.Column('old_owner_id', sa.Integer, nullable=True))
+
+    # Populate the old columns with default values
+    # Generate sequences for the integer IDs if not exist
+    op.execute('CREATE SEQUENCE IF NOT EXISTS user_id_seq AS INTEGER OWNED BY "user".old_id')
+    op.execute('CREATE SEQUENCE IF NOT EXISTS item_id_seq AS INTEGER OWNED BY item.old_id')
+
+    op.execute('SELECT setval(\'user_id_seq\', COALESCE((SELECT MAX(old_id) + 1 FROM "user"), 1), false)')
+    op.execute('SELECT setval(\'item_id_seq\', COALESCE((SELECT MAX(old_id) + 1 FROM item), 1), false)')
+
+    op.execute('UPDATE "user" SET old_id = nextval(\'user_id_seq\')')
+    op.execute('UPDATE item SET old_id = nextval(\'item_id_seq\'), old_owner_id = (SELECT old_id FROM "user" WHERE "user".id = item.owner_id)')
+
+    # Drop new columns and rename old columns back
+    op.drop_constraint('item_owner_id_fkey', 'item', type_='foreignkey')
+    op.drop_column('item', 'owner_id')
+    op.alter_column('item', 'old_owner_id', new_column_name='owner_id')
+
+    op.drop_column('user', 'id')
+    op.alter_column('user', 'old_id', new_column_name='id')
+
+    op.drop_column('item', 'id')
+    op.alter_column('item', 'old_id', new_column_name='id')
+
+    # Create primary key constraint
+    op.create_primary_key('user_pkey', 'user', ['id'])
+    op.create_primary_key('item_pkey', 'item', ['id'])
+
+    # Recreate foreign key constraint
+    op.create_foreign_key('item_owner_id_fkey', 'item', 'user', ['owner_id'], ['id'])

backend/app/api/routes/items.py

@@ -1,3 +1,4 @@
+import uuid
 from typing import Any
 
 from fastapi import APIRouter, HTTPException
@@ -41,7 +42,7 @@ def read_items(
 
 
 @router.get("/{id}", response_model=ItemPublic)
-def read_item(session: SessionDep, current_user: CurrentUser, id: int) -> Any:
+def read_item(session: SessionDep, current_user: CurrentUser, id: uuid.UUID) -> Any:
     """
     Get item by ID.
     """
@@ -69,7 +70,11 @@ def create_item(
 
 @router.put("/{id}", response_model=ItemPublic)
 def update_item(
-    *, session: SessionDep, current_user: CurrentUser, id: int, item_in: ItemUpdate
+    *,
+    session: SessionDep,
+    current_user: CurrentUser,
+    id: uuid.UUID,
+    item_in: ItemUpdate,
 ) -> Any:
     """
     Update an item.
@@ -88,7 +93,9 @@ def update_item(
 
 
 @router.delete("/{id}")
-def delete_item(session: SessionDep, current_user: CurrentUser, id: int) -> Message:
+def delete_item(
+    session: SessionDep, current_user: CurrentUser, id: uuid.UUID
+) -> Message:
     """
     Delete an item.
     """

backend/app/api/routes/users.py

@@ -1,3 +1,4 @@
+import uuid
 from typing import Any
 
 from fastapi import APIRouter, Depends, HTTPException
@@ -163,7 +164,7 @@ def register_user(session: SessionDep, user_in: UserRegister) -> Any:
 
 @router.get("/{user_id}", response_model=UserPublic)
 def read_user_by_id(
-    user_id: int, session: SessionDep, current_user: CurrentUser
+    user_id: uuid.UUID, session: SessionDep, current_user: CurrentUser
 ) -> Any:
     """
     Get a specific user by id.
@@ -187,7 +188,7 @@ def read_user_by_id(
 def update_user(
     *,
     session: SessionDep,
-    user_id: int,
+    user_id: uuid.UUID,
     user_in: UserUpdate,
 ) -> Any:
     """
@@ -213,7 +214,7 @@ def update_user(
 
 @router.delete("/{user_id}", dependencies=[Depends(get_current_active_superuser)])
 def delete_user(
-    session: SessionDep, current_user: CurrentUser, user_id: int
+    session: SessionDep, current_user: CurrentUser, user_id: uuid.UUID
 ) -> Message:
     """
     Delete a user.

backend/app/crud.py

@@ -1,3 +1,4 @@
+import uuid
 from typing import Any
 
 from sqlmodel import Session, select
@@ -45,7 +46,7 @@ def authenticate(*, session: Session, email: str, password: str) -> User | None:
     return db_user
 
 
-def create_item(*, session: Session, item_in: ItemCreate, owner_id: int) -> Item:
+def create_item(*, session: Session, item_in: ItemCreate, owner_id: uuid.UUID) -> Item:
     db_item = Item.model_validate(item_in, update={"owner_id": owner_id})
     session.add(db_item)
     session.commit()

backend/app/models.py

@@ -1,3 +1,5 @@
+import uuid
+
 from pydantic import EmailStr
 from sqlmodel import Field, Relationship, SQLModel
 
@@ -39,14 +41,14 @@ class UpdatePassword(SQLModel):
 
 # Database model, database table inferred from class name
 class User(UserBase, table=True):
-    id: int | None = Field(default=None, primary_key=True)
+    id: uuid.UUID = Field(default_factory=uuid.uuid4, primary_key=True)
     hashed_password: str
     items: list["Item"] = Relationship(back_populates="owner")
 
 
 # Properties to return via API, id is always required
 class UserPublic(UserBase):
-    id: int
+    id: uuid.UUID
 
 
 class UsersPublic(SQLModel):
@@ -72,16 +74,16 @@ class ItemUpdate(ItemBase):
 
 # Database model, database table inferred from class name
 class Item(ItemBase, table=True):
-    id: int | None = Field(default=None, primary_key=True)
+    id: uuid.UUID = Field(default_factory=uuid.uuid4, primary_key=True)
     title: str = Field(max_length=255)
-    owner_id: int | None = Field(default=None, foreign_key="user.id", nullable=False)
+    owner_id: uuid.UUID = Field(foreign_key="user.id", nullable=False)
     owner: User | None = Relationship(back_populates="items")
 
 
 # Properties to return via API, id is always required
 class ItemPublic(ItemBase):
-    id: int
-    owner_id: int
+    id: uuid.UUID
+    owner_id: uuid.UUID
 
 
 class ItemsPublic(SQLModel):
@@ -102,7 +104,7 @@ class Token(SQLModel):
 
 # Contents of JWT token
 class TokenPayload(SQLModel):
-    sub: int | None = None
+    sub: str | None = None
 
 
 class NewPassword(SQLModel):

backend/app/tests/api/routes/test_items.py

@@ -1,3 +1,5 @@
+import uuid
+
 from fastapi.testclient import TestClient
 from sqlmodel import Session
 
@@ -34,15 +36,15 @@ def test_read_item(
     content = response.json()
     assert content["title"] == item.title
     assert content["description"] == item.description
-    assert content["id"] == item.id
-    assert content["owner_id"] == item.owner_id
+    assert content["id"] == str(item.id)
+    assert content["owner_id"] == str(item.owner_id)
 
 
 def test_read_item_not_found(
     client: TestClient, superuser_token_headers: dict[str, str]
 ) -> None:
     response = client.get(
-        f"{settings.API_V1_STR}/items/999",
+        f"{settings.API_V1_STR}/items/{uuid.uuid4()}",
         headers=superuser_token_headers,
     )
     assert response.status_code == 404
@@ -91,8 +93,8 @@ def test_update_item(
     content = response.json()
     assert content["title"] == data["title"]
     assert content["description"] == data["description"]
-    assert content["id"] == item.id
-    assert content["owner_id"] == item.owner_id
+    assert content["id"] == str(item.id)
+    assert content["owner_id"] == str(item.owner_id)
 
 
 def test_update_item_not_found(
@@ -100,7 +102,7 @@ def test_update_item_not_found(
 ) -> None:
     data = {"title": "Updated title", "description": "Updated description"}
     response = client.put(
-        f"{settings.API_V1_STR}/items/999",
+        f"{settings.API_V1_STR}/items/{uuid.uuid4()}",
         headers=superuser_token_headers,
         json=data,
     )
@@ -141,7 +143,7 @@ def test_delete_item_not_found(
     client: TestClient, superuser_token_headers: dict[str, str]
 ) -> None:
     response = client.delete(
-        f"{settings.API_V1_STR}/items/999",
+        f"{settings.API_V1_STR}/items/{uuid.uuid4()}",
         headers=superuser_token_headers,
     )
     assert response.status_code == 404

backend/app/tests/api/routes/test_users.py

@@ -1,3 +1,4 @@
+import uuid
 from unittest.mock import patch
 
 from fastapi.testclient import TestClient
@@ -105,7 +106,7 @@ def test_get_existing_user_permissions_error(
     client: TestClient, normal_user_token_headers: dict[str, str]
 ) -> None:
     r = client.get(
-        f"{settings.API_V1_STR}/users/999999",
+        f"{settings.API_V1_STR}/users/{uuid.uuid4()}",
         headers=normal_user_token_headers,
     )
     assert r.status_code == 403
@@ -371,7 +372,7 @@ def test_update_user_not_exists(
 ) -> None:
     data = {"full_name": "Updated_full_name"}
     r = client.patch(
-        f"{settings.API_V1_STR}/users/99999999",
+        f"{settings.API_V1_STR}/users/{uuid.uuid4()}",
         headers=superuser_token_headers,
         json=data,
     )
@@ -468,7 +469,7 @@ def test_delete_user_not_found(
     client: TestClient, superuser_token_headers: dict[str, str]
 ) -> None:
     r = client.delete(
-        f"{settings.API_V1_STR}/users/99999999",
+        f"{settings.API_V1_STR}/users/{uuid.uuid4()}",
         headers=superuser_token_headers,
     )
     assert r.status_code == 404