Update UI and logic for supplier name and call button

backend/app/routers/supplier_materials.py

@@ -7,7 +7,7 @@ GET /materials/{id}/suppliers — suppliers linked to a material.
 from uuid import UUID
 
 from fastapi import APIRouter, Depends, Query
-from sqlalchemy import select
+from sqlalchemy import func, select
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.db.engine import get_db
@@ -28,7 +28,11 @@ def link_to_dict(
     category: MaterialCategory | None = None,
     supplier: Supplier | None = None,
 ) -> dict:
+<<<<<<< Updated upstream
     """Serialize a SupplierMaterial ORM row to a plain dict for the API envelope."""
+=======
+    """Serialize a SupplierMaterial ORM row to a plain dict."""
+>>>>>>> Stashed changes
     return {
         "id": str(link.id),
         "supplier_id": str(link.supplier_id),
@@ -111,6 +115,7 @@ async def create_supplier_material(
 async def delete_supplier_material(
     supplier_id: UUID,
     material_id: UUID,
+<<<<<<< Updated upstream
     db: AsyncSession = Depends(get_db),
 ):
     async with db.begin():
@@ -161,12 +166,61 @@ async def list_material_suppliers(
               "location":       "تهران" | null
             }
           ]
+=======
+    db: AsyncSession = Depends(get_db),
+):
+    async with db.begin():
+        await unlink_supplier_material(db, supplier_id, material_id)
+    return {
+        "data": {
+            "supplier_id": str(supplier_id),
+            "material_id": str(material_id),
+            "deleted": True,
+        }
+    }
+
+
+# ---------------------------------------------------------------------------
+# GET /materials/{material_id}/suppliers
+# ---------------------------------------------------------------------------
+
+@router.get(
+    "/materials/{material_id}/suppliers",
+    summary="List all suppliers linked to a material",
+)
+async def list_material_suppliers(
+    material_id: UUID,
+    page: int = Query(1, ge=1),
+    page_size: int = Query(20, ge=1, le=100),
+    db: AsyncSession = Depends(get_db),
+):
+    """Return a paginated list of suppliers for a given material.
+
+    Uses explicit column-level SELECT with named labels so SQLAlchemy returns
+    plain Row tuples — no ORM identity-map involvement — eliminating the
+    string-vs-UUID comparison bug and the stale-entity collision that occurred
+    when selecting two mapped entities in the same session.
+
+    Response shape (matched by the frontend RawMaterialSupplier interface):
+        {
+          "data": [
+            {
+              "id": "<supplier_uuid>",
+              "name": "فولاد ناب آریا",
+              "phone": "021-..." | null,
+              "contact_person": "علی محمدی" | null,
+              "location": "تهران" | null
+            }
+          ],
+          "meta": {"total": 1, "page": 1, "page_size": 20}
+>>>>>>> Stashed changes
         }
     """
     material = await db.get(Material, material_id)
     if material is None:
         raise NotFoundError("متریال یافت نشد")
 
+<<<<<<< Updated upstream
     stmt = (
         select(Supplier)
         .join(SupplierMaterial, Supplier.id == SupplierMaterial.supplier_id)
@@ -186,4 +240,50 @@ async def list_material_suppliers(
             }
             for supplier in suppliers
         ]
+=======
+    total: int = (
+        await db.scalar(
+            select(func.count(SupplierMaterial.id)).where(
+                SupplierMaterial.material_id == material_id
+            )
+        )
+    ) or 0
+
+    if total == 0:
+        return {"data": [], "meta": {"total": 0, "page": page, "page_size": page_size}}
+
+    # Explicit column-level SELECT — returns plain Row objects keyed by label,
+    # never ORM entities, so no identity-map collision is possible.
+    stmt = (
+        select(
+            Supplier.id.label("sup_id"),
+            Supplier.name.label("sup_name"),
+            Supplier.phone.label("sup_phone"),
+            Supplier.contact_person.label("sup_contact_person"),
+            Supplier.location.label("sup_location"),
+        )
+        .join(SupplierMaterial, Supplier.id == SupplierMaterial.supplier_id)
+        .where(SupplierMaterial.material_id == material_id)
+        .order_by(SupplierMaterial.last_quoted_at.desc().nulls_last())
+        .offset((page - 1) * page_size)
+        .limit(page_size)
+    )
+
+    rows = (await db.execute(stmt)).all()
+
+    data = [
+        {
+            "id": str(row.sup_id),
+            "name": row.sup_name,
+            "phone": row.sup_phone,
+            "contact_person": row.sup_contact_person,
+            "location": row.sup_location,
+        }
+        for row in rows
+    ]
+
+    return {
+        "data": data,
+        "meta": {"total": total, "page": page, "page_size": page_size},
+>>>>>>> Stashed changes
     }