feat: add condition field in pricing rule

erpnext/accounts/doctype/pricing_rule/pricing_rule.json

@@ -1,4 +1,5 @@
 {
+ "actions": [],
  "allow_import": 1,
  "allow_rename": 1,
  "autoname": "field:title",
@@ -12,6 +13,7 @@
   "apply_on",
   "price_or_product_discount",
   "warehouse",
+  "condition",
   "column_break_7",
   "items",
   "item_groups",
@@ -550,11 +552,18 @@
    "fieldtype": "Link",
    "label": "Promotional Scheme",
    "options": "Promotional Scheme"
+  },
+  {
+   "description": "Simple Python Expression, Example: territory != 'All Territories'",
+   "fieldname": "condition",
+   "fieldtype": "Code",
+   "label": "Condition"
   }
  ],
  "icon": "fa fa-gift",
  "idx": 1,
- "modified": "2019-12-18 17:29:22.957077",
+ "links": [],
+ "modified": "2020-08-12 20:15:32.279592",
  "modified_by": "Administrator",
  "module": "Accounts",
  "name": "Pricing Rule",

erpnext/accounts/doctype/pricing_rule/pricing_rule.py

@@ -7,9 +7,10 @@ from __future__ import unicode_literals
 import frappe
 import json
 import copy
+import re
+
 from frappe import throw, _
 from frappe.utils import flt, cint, getdate
-
 from frappe.model.document import Document
 
 from six import string_types
@@ -31,6 +32,7 @@ class PricingRule(Document):
 		self.validate_max_discount()
 		self.validate_price_list_with_currency()
 		self.validate_dates()
+		validate_condition(self)
 
 		if not self.margin_type: self.margin_rate_or_amount = 0.0
 
@@ -141,6 +143,16 @@ class PricingRule(Document):
 		if self.valid_from and self.valid_upto and getdate(self.valid_from) > getdate(self.valid_upto):
 			frappe.throw(_("Valid from date must be less than valid upto date"))
 
+def validate_condition(doc, args=None):
+	if doc.condition and ("=" in doc.condition) and re.match("""[\w\.:_]+\s*={1}\s*[\w\.@'"]+""", doc.condition):
+		frappe.throw(_("Invalid condition in Pricing Rule: {0}").format(doc.name), frappe.ValidationError)
+	else:
+		try:
+			return frappe.safe_eval(doc.condition, None, args) if bool(args) else True
+		except Exception as e:
+			frappe.throw(doc.name + " Pricing Rule 'Condition' field error:<br>" + str(e).capitalize() )
+			return False
+
 #--------------------------------------------------------------------------------
 
 @frappe.whitelist()
@@ -252,6 +264,8 @@ def get_pricing_rule_for_item(args, price_list_rate=0, doc=None, for_validate=Fa
 
 			if pricing_rule.get('suggestion'): continue
 
+			if not validate_condition(pricing_rule, args): continue
+
 			item_details.validate_applied_rule = pricing_rule.get("validate_applied_rule", 0)
 			item_details.price_or_product_discount = pricing_rule.get("price_or_product_discount")