feat(pricing rule): free qty rounding and recursion qty (#32577)

Option to specify recursion start qty and repeating qty

Co-authored-by: Deepesh Garg <deepeshgarg6@gmail.com>
(cherry picked from commit 1d83fb2)

erpnext/accounts/doctype/pricing_rule/pricing_rule.json

@@ -52,7 +52,10 @@
   "free_item_rate",
   "column_break_42",
   "free_item_uom",
+  "round_free_qty",
   "is_recursive",
+  "recurse_for",
+  "apply_recursion_over",
   "section_break_23",
   "valid_from",
   "valid_upto",
@@ -578,12 +581,34 @@
    "fieldtype": "Select",
    "label": "Naming Series",
    "options": "PRLE-.####"
+  },
+  {
+   "default": "0",
+   "fieldname": "round_free_qty",
+   "fieldtype": "Check",
+   "label": "Round Free Qty"
+  },
+  {
+   "depends_on": "is_recursive",
+   "description": "Give free item for every N quantity",
+   "fieldname": "recurse_for",
+   "fieldtype": "Float",
+   "label": "Recurse Every (As Per Transaction UOM)",
+   "mandatory_depends_on": "is_recursive"
+  },
+  {
+   "default": "0",
+   "depends_on": "is_recursive",
+   "description": "Qty for which recursion isn't applicable.",
+   "fieldname": "apply_recursion_over",
+   "fieldtype": "Float",
+   "label": "Apply Recursion Over (As Per Transaction UOM)"
   }
  ],
  "icon": "fa fa-gift",
  "idx": 1,
  "links": [],
- "modified": "2022-09-16 16:00:38.356266",
+ "modified": "2022-10-13 19:05:35.056304",
  "modified_by": "Administrator",
  "module": "Accounts",
  "name": "Pricing Rule",

erpnext/accounts/doctype/pricing_rule/pricing_rule.py

@@ -24,6 +24,7 @@ def validate(self):
 		self.validate_applicable_for_selling_or_buying()
 		self.validate_min_max_amt()
 		self.validate_min_max_qty()
+		self.validate_recursion()
 		self.cleanup_fields_value()
 		self.validate_rate_or_discount()
 		self.validate_max_discount()
@@ -109,6 +110,18 @@ def validate_min_max_amt(self):
 		if self.min_amt and self.max_amt and flt(self.min_amt) > flt(self.max_amt):
 			throw(_("Min Amt can not be greater than Max Amt"))
 
+	def validate_recursion(self):
+		if self.price_or_product_discount != "Product":
+			return
+		if self.free_item or self.same_item:
+			if flt(self.recurse_for) <= 0:
+				self.recurse_for = 1
+		if self.is_recursive:
+			if flt(self.apply_recursion_over) > flt(self.min_qty):
+				throw(_("Min Qty should be greater than Recurse Over Qty"))
+			if flt(self.apply_recursion_over) < 0:
+				throw(_("Recurse Over Qty cannot be less than 0"))
+
 	def cleanup_fields_value(self):
 		for logic_field in ["apply_on", "applicable_for", "rate_or_discount"]:
 			fieldname = frappe.scrub(self.get(logic_field) or "")

erpnext/accounts/doctype/pricing_rule/test_pricing_rule.py

@@ -943,6 +943,45 @@ def test_pricing_rule_for_other_items_cond_with_amount(self):
 		si.delete()
 		rule.delete()
 
+	def test_pricing_rule_for_product_free_item_rounded_qty_and_recursion(self):
+		frappe.delete_doc_if_exists("Pricing Rule", "_Test Pricing Rule")
+		test_record = {
+			"doctype": "Pricing Rule",
+			"title": "_Test Pricing Rule",
+			"apply_on": "Item Code",
+			"currency": "USD",
+			"items": [
+				{
+					"item_code": "_Test Item",
+				}
+			],
+			"selling": 1,
+			"rate": 0,
+			"min_qty": 3,
+			"max_qty": 7,
+			"price_or_product_discount": "Product",
+			"same_item": 1,
+			"free_qty": 1,
+			"round_free_qty": 1,
+			"is_recursive": 1,
+			"recurse_for": 2,
+			"company": "_Test Company",
+		}
+		frappe.get_doc(test_record.copy()).insert()
+
+		# With pricing rule
+		so = make_sales_order(item_code="_Test Item", qty=5)
+		so.load_from_db()
+		self.assertEqual(so.items[1].is_free_item, 1)
+		self.assertEqual(so.items[1].item_code, "_Test Item")
+		self.assertEqual(so.items[1].qty, 2)
+
+		so = make_sales_order(item_code="_Test Item", qty=7)
+		so.load_from_db()
+		self.assertEqual(so.items[1].is_free_item, 1)
+		self.assertEqual(so.items[1].item_code, "_Test Item")
+		self.assertEqual(so.items[1].qty, 4)
+
 
 test_dependencies = ["Campaign"]
 

erpnext/accounts/doctype/pricing_rule/utils.py

@@ -627,9 +627,13 @@ def get_product_discount_rule(pricing_rule, item_details, args=None, doc=None):
 
 	qty = pricing_rule.free_qty or 1
 	if pricing_rule.is_recursive:
-		transaction_qty = args.get("qty") if args else doc.total_qty
+		transaction_qty = (
+			args.get("qty") if args else doc.total_qty
+		) - pricing_rule.apply_recursion_over
 		if transaction_qty:
-			qty = flt(transaction_qty) * qty
+			qty = flt(transaction_qty) * qty / pricing_rule.recurse_for
+			if pricing_rule.round_free_qty:
+				qty = round(qty)
 
 	free_item_data_args = {
 		"item_code": free_item,

erpnext/public/js/controllers/transaction.js

@@ -1404,7 +1404,7 @@ erpnext.TransactionController = class TransactionController extends erpnext.taxe
 				if (!r.exc && r.message) {
 					me._set_values_for_item_list(r.message);
 					if(item) me.set_gross_profit(item);
-					if(me.frm.doc.apply_discount_on) me.frm.trigger("apply_discount_on")
+					if (me.frm.doc.apply_discount_on) me.frm.trigger("apply_discount_on")
 				}
 			}
 		});
@@ -1577,6 +1577,7 @@ erpnext.TransactionController = class TransactionController extends erpnext.taxe
 			for (let key in pr_row) {
 				row_to_modify[key] = pr_row[key];
 			}
+			this.frm.script_manager.copy_from_first_row("items", row_to_modify, ["expense_account", "income_account"]);
 		});
 
 		// free_item_data is a temporary variable