diff --git a/fooder/controller/meal.py b/fooder/controller/meal.py
index c0e8132..dafee32 100644
--- a/fooder/controller/meal.py
+++ b/fooder/controller/meal.py
@@ -22,9 +22,7 @@ class CreateMeal(AuthorizedController):
                 raise HTTPException(status_code=404, detail="not found")
 
             try:
-                meal = await DBMeal.create(
-                    session, content.diary_id, content.order, content.name
-                )
+                meal = await DBMeal.create(session, content.diary_id, content.name)
                 return Meal.from_orm(meal)
             except AssertionError as e:
                 raise HTTPException(status_code=400, detail=e.args[0])
@@ -75,7 +73,7 @@ class CreateMealFromPreset(AuthorizedController):
 
             try:
                 meal = await DBMeal.create_from_preset(
-                    session, content.diary_id, content.order, content.name, preset
+                    session, content.diary_id, content.name, preset
                 )
                 return Meal.from_orm(meal)
             except AssertionError as e:
diff --git a/fooder/domain/meal.py b/fooder/domain/meal.py
index ab541ae..7db038d 100644
--- a/fooder/domain/meal.py
+++ b/fooder/domain/meal.py
@@ -65,13 +65,14 @@ class Meal(Base, CommonMixin):
         cls,
         session: AsyncSession,
         diary_id: int,
-        order: int = 0,
         name: Optional[str] = None,
     ) -> "Meal":
         # check if order already exists in diary
-        query = select(cls).where(cls.diary_id == diary_id).where(cls.order == order)
+        query = (
+            select(cls.order).where(cls.diary_id == diary_id).order_by(cls.order.desc())
+        )
         existing_meal = await session.scalar(query)
-        assert existing_meal is None, "order already exists in diary"
+        order = existing_meal + 1 if existing_meal else 1
 
         if name is None:
             name = f"Meal {order}"
@@ -93,14 +94,15 @@ class Meal(Base, CommonMixin):
         cls,
         session: AsyncSession,
         diary_id: int,
-        order: int,
         name: Optional[str],
         preset: Preset,
     ) -> "Meal":
         # check if order already exists in diary
-        query = select(cls).where(cls.diary_id == diary_id).where(cls.order == order)
+        query = (
+            select(cls.order).where(cls.diary_id == diary_id).order_by(cls.order.desc())
+        )
         existing_meal = await session.scalar(query)
-        assert existing_meal is None, "order already exists in diary"
+        order = existing_meal + 1 if existing_meal else 1
 
         if name is None:
             name = preset.name or f"Meal {order}"
diff --git a/fooder/domain/product.py b/fooder/domain/product.py
index ac700c9..4b50e8b 100644
--- a/fooder/domain/product.py
+++ b/fooder/domain/product.py
@@ -33,9 +33,7 @@ class Product(Base, CommonMixin):
         if q:
             q_list = q.split()
             for qq in q_list:
-                query = query.filter(
-                    cls.name.ilike(f"%{qq.lower()}%")
-                )
+                query = query.filter(cls.name.ilike(f"%{qq.lower()}%"))
 
         query = query.offset(offset).limit(limit)
         stream = await session.stream_scalars(query.order_by(cls.id))
diff --git a/fooder/model/meal.py b/fooder/model/meal.py
index 739db4f..d9e1b13 100644
--- a/fooder/model/meal.py
+++ b/fooder/model/meal.py
@@ -25,7 +25,6 @@ class CreateMealPayload(BaseModel):
     """CreateMealPayload."""
 
     name: Optional[str]
-    order: int
     diary_id: int
 
 
@@ -39,6 +38,5 @@ class CreateMealFromPresetPayload(BaseModel):
     """CreateMealPayload."""
 
     name: Optional[str]
-    order: int
     diary_id: int
     preset_id: int
diff --git a/requirements_local.txt b/requirements_local.txt
index 80f1e13..3a8626f 100644
--- a/requirements_local.txt
+++ b/requirements_local.txt
@@ -6,3 +6,4 @@ uvicorn[standard]
 python-jose[cryptography]
 passlib[bcrypt]
 fastapi-users
+pytest
diff --git a/test.sh b/test.sh
index 2e09a40..65ed4d7 100755
--- a/test.sh
+++ b/test.sh
@@ -54,7 +54,7 @@ ${DC} exec api bash -c "python -m fooder --create-tables"
 
 # finally run tests
 set -xe
-pytest fooder -sv -k "${TESTS}"
+python -m pytest fooder -sv -k "${TESTS}"
 
 # clean up after tests
 echo "cleaning up..."