Uniquely constrained users table (#2483)

* use db constrains for users

* lint a bit

* coderabbitai

* set rate limits for login api

* Revert "set rate limits for login api"

This reverts commit 78ce40e.

* bring checks back

* Auto-update of Starter template

* Auto-update of NLP template

* review suggestions

* resolve branching

* Auto-update of Starter template

* Auto-update of NLP template

* lint

---------

Co-authored-by: GitHub Actions <actions@github.com>

src/zenml/zen_stores/migrations/versions/72675226b2de_unique_users.py

@@ -0,0 +1,31 @@
+"""unique users [72675226b2de].
+
+Revision ID: 72675226b2de
+Revises: 0.55.4
+Create Date: 2024-02-29 14:58:25.584731
+
+"""
+
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision = "72675226b2de"
+down_revision = "0.55.4"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    """Upgrade database schema and/or data, creating a new revision."""
+    with op.batch_alter_table("user", schema=None) as batch_op:
+        batch_op.create_unique_constraint(
+            "uq_user_name_is_service_account", ["name", "is_service_account"]
+        )
+
+
+def downgrade() -> None:
+    """Downgrade database schema and/or data back to the previous revision."""
+    with op.batch_alter_table("user", schema=None) as batch_op:
+        batch_op.drop_constraint(
+            "uq_user_name_is_service_account", type_="unique"
+        )

src/zenml/zen_stores/schemas/user_schemas.py

@@ -17,7 +17,7 @@
 from typing import TYPE_CHECKING, Any, List, Optional
 from uuid import UUID
 
-from sqlalchemy import TEXT, Column
+from sqlalchemy import TEXT, Column, UniqueConstraint
 from sqlmodel import Field, Relationship
 
 from zenml.models import (
@@ -65,6 +65,7 @@ class UserSchema(NamedSchema, table=True):
     """SQL Model for users."""
 
     __tablename__ = "user"
+    __table_args__ = (UniqueConstraint("name", "is_service_account"),)
 
     is_service_account: bool = Field(default=False)
     full_name: str

src/zenml/zen_stores/sql_zen_store.py

@@ -5146,28 +5146,29 @@ def create_service_account(
                 already exists.
         """
         with Session(self.engine) as session:
+            # Check if a service account with the given name already
+            # exists
+            err_msg = (
+                f"Unable to create service account with name "
+                f"'{service_account.name}': Found existing service "
+                "account with this name."
+            )
+            try:
+                self._get_account_schema(
+                    service_account.name, session=session, service_account=True
+                )
+                raise EntityExistsError(err_msg)
+            except KeyError:
+                pass
+
             # Create the service account
             new_account = UserSchema.from_service_account_request(
                 service_account
             )
             session.add(new_account)
+            # on commit an IntegrityError may arise we let it bubble up
+            session.commit()
 
-            # Check if a service account with the given name already
-            # exists
-            service_accounts = session.execute(
-                select(UserSchema).where(
-                    UserSchema.name == service_account.name,
-                    UserSchema.is_service_account.is_(True),  # type: ignore[attr-defined]
-                )
-            ).fetchall()
-            if len(service_accounts) == 1:
-                session.commit()
-            else:
-                raise EntityExistsError(
-                    f"Unable to create service account with name "
-                    f"'{service_account.name}': Found existing service "
-                    "account with this name."
-                )
             return new_account.to_service_account_model(include_metadata=True)
 
     def get_service_account(
@@ -7357,24 +7358,27 @@ def create_user(self, user: UserRequest) -> UserResponse:
                 already exists.
         """
         with Session(self.engine) as session:
+            # Check if a user account with the given name already exists
+            err_msg = (
+                f"Unable to create user with name '{user.name}': "
+                f"Found an existing user account with this name."
+            )
+            try:
+                self._get_account_schema(
+                    user.name,
+                    session=session,
+                    # Filter out service accounts
+                    service_account=False,
+                )
+                raise EntityExistsError(err_msg)
+            except KeyError:
+                pass
+
             # Create the user
             new_user = UserSchema.from_user_request(user)
             session.add(new_user)
-
-            # Check if a user account with the given name already exists
-            users = session.execute(
-                select(UserSchema).where(
-                    UserSchema.name == user.name,
-                    UserSchema.is_service_account.is_(False),  # type: ignore[attr-defined]
-                )
-            ).fetchall()
-            if len(users) == 1:
-                session.commit()
-            else:
-                raise EntityExistsError(
-                    f"Unable to create user with name '{user.name}': "
-                    f"Found an existing user account with this name."
-                )
+            # on commit an IntegrityError may arise we let it bubble up
+            session.commit()
             return new_user.to_model(include_metadata=True)
 
     def get_user(

tests/integration/functional/zen_stores/test_zen_store.py

@@ -22,6 +22,7 @@
 
 import pytest
 from pydantic import SecretStr
+from sqlalchemy.exc import IntegrityError
 
 from tests.integration.functional.utils import sample_name
 from tests.integration.functional.zen_stores.utils import (
@@ -422,7 +423,7 @@ def silent_create_user(user_request: UserRequest):
         """
         try:
             clean_client.zen_store.create_user(user_request)
-        except EntityExistsError:
+        except (EntityExistsError, IntegrityError):
             pass
 
     user_name = "test_user"
@@ -463,7 +464,7 @@ def silent_create_service_account(
             clean_client.zen_store.create_service_account(
                 service_account_request
             )
-        except EntityExistsError:
+        except (EntityExistsError, IntegrityError):
             pass
 
     user_name = "test_user"