perf: batch per-row bin lookups in sales invoice and delivery note

sales invoice's update_current_stock ran one bin query per item row and one
per packed row. delivery note already batched the same work by warehouse, so
lift that into get_bin_qty_map in stock/utils.py and have both call it.

also batch the per-batch expiry_date lookup in get_batches_by_oldest, and drop
three now-unused per-row setters: delivery note's set_actual_qty (already dead
before this change), sales invoice item's set_actual_qty and packed item's
set_actual_and_projected_qty.

erpnext/accounts/doctype/sales_invoice/sales_invoice.py

@@ -29,6 +29,7 @@ from erpnext.setup.doctype.company.company import update_company_current_month_s
 from erpnext.stock.doctype.delivery_note.services.billing_status import (
 	update_billed_amount_based_on_so,
 )
+from erpnext.stock.utils import get_bin_qty_map
 
 from .services.fixed_assets import FixedAssetService
 from .services.inter_company import (
@@ -991,11 +992,17 @@ class SalesInvoice(SellingController):
 			)
 
 	def update_current_stock(self):
+		bin_qty_map = get_bin_qty_map(self.items + self.packed_items)
+
 		for item in self.items:
-			item.set_actual_qty()
+			if item.item_code and item.warehouse:
+				bin_data = bin_qty_map.get((item.item_code, item.warehouse))
+				item.actual_qty = bin_data.actual_qty if bin_data else 0
 
 		for packed_item in self.packed_items:
-			packed_item.set_actual_and_projected_qty()
+			bin_data = bin_qty_map.get((packed_item.item_code, packed_item.warehouse))
+			packed_item.actual_qty = bin_data.actual_qty if bin_data else 0
+			packed_item.projected_qty = bin_data.projected_qty if bin_data else 0
 
 	def update_packing_list(self):
 		if cint(self.update_stock) == 1:

erpnext/accounts/doctype/sales_invoice_item/sales_invoice_item.py

@@ -114,15 +114,6 @@ class SalesInvoiceItem(Document):
 				)
 			)
 
-	def set_actual_qty(self):
-		if self.item_code and self.warehouse:
-			self.actual_qty = (
-				frappe.db.get_value(
-					"Bin", {"item_code": self.item_code, "warehouse": self.warehouse}, "actual_qty"
-				)
-				or 0
-			)
-
 	def set_income_account_for_fixed_asset(self, company: str):
 		"""Set income account for fixed asset item based on company's disposal account and cost center."""
 		if not self.is_fixed_asset:

erpnext/stock/doctype/batch/batch.py

@@ -296,7 +296,18 @@ def get_batch_qty(
 def get_batches_by_oldest(item_code: str, warehouse: str):
 	"""Returns the oldest batch and qty for the given item_code and warehouse"""
 	batches = get_batch_qty(item_code=item_code, warehouse=warehouse)
-	batches_dates = [[batch, frappe.get_value("Batch", batch.batch_no, "expiry_date")] for batch in batches]
+	if not batches:
+		return []
+
+	expiry_dates = dict(
+		frappe.get_all(
+			"Batch",
+			filters={"name": ["in", {batch.batch_no for batch in batches}]},
+			fields=["name", "expiry_date"],
+			as_list=True,
+		)
+	)
+	batches_dates = [[batch, expiry_dates.get(batch.batch_no)] for batch in batches]
 	batches_dates.sort(key=lambda tup: (tup[1] is None, tup[1]))
 	return batches_dates
 

erpnext/stock/doctype/delivery_note/delivery_note.py

@@ -10,6 +10,7 @@ from erpnext.controllers.selling_controller import SellingController
 from erpnext.stock.doctype.delivery_note.services.billing_status import BillingStatusService
 from erpnext.stock.doctype.delivery_note.services.packing import PackingService
 from erpnext.stock.doctype.packed_item.packed_item import make_packing_list
+from erpnext.stock.utils import get_bin_qty_map
 
 form_grid_templates = {"items": "templates/form_grid/item_grid.html"}
 
@@ -258,14 +259,6 @@ class DeliveryNote(SellingController):
 
 		super().before_print(settings)
 
-	def set_actual_qty(self):
-		for d in self.get("items"):
-			if d.item_code and d.warehouse:
-				actual_qty = frappe.db.get_value(
-					"Bin", {"item_code": d.item_code, "warehouse": d.warehouse}, "actual_qty"
-				)
-				d.actual_qty = flt(actual_qty) or 0
-
 	def so_required(self):
 		"""check in manage account if sales order required or not"""
 		if frappe.get_single_value("Selling Settings", "so_required") == "Yes":
@@ -404,28 +397,14 @@ class DeliveryNote(SellingController):
 		if not (self.get("_action") and self._action != "update_after_submit"):
 			return
 
-		warehouse_item_codes = {}
-		for d in self.get("items") + self.get("packed_items"):
-			warehouse_item_codes.setdefault(d.warehouse, set()).add(d.item_code)
-
-		if not warehouse_item_codes:
-			return
-
-		bin_map = {}
-		for warehouse, item_codes in warehouse_item_codes.items():
-			for b in frappe.get_all(
-				"Bin",
-				filters={"item_code": ["in", item_codes], "warehouse": warehouse},
-				fields=["item_code", "actual_qty", "projected_qty"],
-			):
-				bin_map[(b.item_code, warehouse)] = b
+		bin_qty_map = get_bin_qty_map(self.get("items") + self.get("packed_items"))
 
 		for d in self.get("items"):
-			bin_data = bin_map.get((d.item_code, d.warehouse))
+			bin_data = bin_qty_map.get((d.item_code, d.warehouse))
 			d.actual_qty = bin_data.actual_qty if bin_data else None
 
 		for d in self.get("packed_items"):
-			bin_data = bin_map.get((d.item_code, d.warehouse))
+			bin_data = bin_qty_map.get((d.item_code, d.warehouse))
 			if bin_data:
 				d.actual_qty = flt(bin_data.actual_qty)
 				d.projected_qty = flt(bin_data.projected_qty)

erpnext/stock/doctype/packed_item/packed_item.py

@@ -56,16 +56,7 @@ class PackedItem(Document):
 		warehouse: DF.Link | None
 	# end: auto-generated types
 
-	def set_actual_and_projected_qty(self):
-		"Set actual and projected qty based on warehouse and item_code"
-		_bin = frappe.db.get_value(
-			"Bin",
-			{"item_code": self.item_code, "warehouse": self.warehouse},
-			["actual_qty", "projected_qty"],
-			as_dict=True,
-		)
-		self.actual_qty = _bin.actual_qty if _bin else 0
-		self.projected_qty = _bin.projected_qty if _bin else 0
+	pass
 
 
 def make_packing_list(doc):

erpnext/stock/utils.py

@@ -205,6 +205,32 @@ def get_latest_stock_balance():
 	return bin_map
 
 
+def get_bin_qty_map(rows) -> dict[tuple[str, str], frappe._dict]:
+	"""Map ``(item_code, warehouse)`` to its Bin's actual and projected qty.
+
+	Fetched in a single query so a document costs one query instead of one per
+	row. Rows without an item or warehouse are skipped, and item/warehouse pairs
+	with no Bin are absent from the map.
+	"""
+	item_codes = set()
+	warehouses = set()
+	for row in rows:
+		if row.item_code and row.warehouse:
+			item_codes.add(row.item_code)
+			warehouses.add(row.warehouse)
+
+	if not item_codes:
+		return {}
+
+	bins = frappe.get_all(
+		"Bin",
+		filters={"item_code": ["in", item_codes], "warehouse": ["in", warehouses]},
+		fields=["item_code", "warehouse", "actual_qty", "projected_qty"],
+	)
+
+	return {(bin.item_code, bin.warehouse): bin for bin in bins}
+
+
 def get_bin(item_code, warehouse):
 	bin = frappe.db.get_value("Bin", {"item_code": item_code, "warehouse": warehouse})
 	if not bin: