v0.1.31 - Mix Editor multi edit

backend/app/api/editor.py

@@ -423,6 +423,45 @@ def update_editor_mix(
     return _serialize_mix_row(mix, visible_count=visible_count, product_count=total)
 
 
+@router.delete("/mixes/{mix_id}", status_code=204)
+def delete_editor_mix(
+    mix_id: int,
+    session: AuthSession = Depends(_require_editor_session),
+    db: Session = Depends(get_db),
+):
+    """Delete a mix that no product depends on.
+
+    A product must reference a mix (`products.mix_id` is NOT NULL), so a mix that
+    still drives products can't be removed without orphaning them — those should
+    be marked inactive instead. The mix's own ingredient rows cascade away with
+    it via the `delete-orphan` relationship.
+    """
+    mix = db.scalar(select(Mix).where(Mix.id == mix_id, Mix.tenant_id == session.tenant_id))
+    if mix is None:
+        raise HTTPException(status_code=404, detail="Mix not found")
+
+    product_total = (
+        db.scalar(
+            select(func.count())
+            .select_from(Product)
+            .where(Product.tenant_id == session.tenant_id, Product.mix_id == mix_id)
+        )
+        or 0
+    )
+    if product_total > 0:
+        raise HTTPException(
+            status_code=409,
+            detail=(
+                f"This mix has {product_total} linked product"
+                f"{'s' if product_total != 1 else ''}. Mark it inactive or remove its products first."
+            ),
+        )
+
+    db.delete(mix)
+    db.commit()
+    return None
+
+
 @router.get("/mixes/{mix_id}/ingredients", response_model=EditorMixFormulaRead)
 def get_editor_mix_ingredients(
     mix_id: int,

backend/pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "hunter-backend"
-version = "0.1.30"
+version = "0.1.31"
 description = "Costing platform MVP backend (API for Hunter)"
 requires-python = ">=3.11"
 dependencies = [

backend/tests/test_editor_formula.py

@@ -10,8 +10,11 @@ from __future__ import annotations
 from sqlalchemy import create_engine, select
 from sqlalchemy.orm import Session, sessionmaker
 
+import pytest
+from fastapi import HTTPException
+
 from app.api.deps import AuthSession
-from app.api.editor import replace_editor_mix_formula
+from app.api.editor import delete_editor_mix, replace_editor_mix_formula
 from app.db.session import Base
 from app.models.mix import Mix, MixIngredient
 from app.models.product import Product, ProductIngredient
@@ -175,6 +178,48 @@ def test_replace_product_formula_writes_product_ingredients():
     ]
 
 
+def test_delete_mix_without_products_removes_mix_and_ingredients():
+    """A product-less mix can be deleted; its ingredient rows cascade away."""
+    db = _session()
+    maize = _raw(db, "Maize")
+    mix = Mix(tenant_id=TENANT, client_name="Hunter", name="Plain Mix")
+    db.add(mix)
+    db.flush()
+    db.add(MixIngredient(tenant_id=TENANT, mix_id=mix.id, raw_material_id=maize.id, quantity_kg=50))
+    db.commit()
+    mix_id = mix.id
+
+    delete_editor_mix(mix_id, session=_editor_session(), db=db)
+
+    assert db.scalar(select(Mix).where(Mix.id == mix_id)) is None
+    assert db.scalars(select(MixIngredient).where(MixIngredient.mix_id == mix_id)).first() is None
+
+
+def test_delete_mix_with_products_is_refused():
+    """A mix that still drives products can't be deleted (409) — products must
+    keep a mix, so the user marks it inactive instead."""
+    db = _session()
+    mix = Mix(tenant_id=TENANT, client_name="Hunter", name="Layer Mix")
+    db.add(mix)
+    db.flush()
+    db.add(
+        Product(
+            tenant_id=TENANT, client_name="Hunter", name="Layer 20kg", mix_id=mix.id,
+            unit_of_measure="20kg bag", visible=True,
+        )
+    )
+    db.commit()
+    mix_id = mix.id
+
+    with pytest.raises(HTTPException) as excinfo:
+        delete_editor_mix(mix_id, session=_editor_session(), db=db)
+
+    assert excinfo.value.status_code == 409
+    assert "linked product" in excinfo.value.detail
+    # The mix is left intact.
+    assert db.scalar(select(Mix).where(Mix.id == mix_id)) is not None
+
+
 def test_representative_product_prefers_20kg_bag():
     db = _session()
     maize = _raw(db, "Maize")