fix: contact duplication on converting lead to customer (#29001)

* fix: contact duplication on converting lead to customer

* fix: added test case

erpnext/crm/doctype/lead/test_lead.py

@@ -23,6 +23,17 @@ class TestLead(unittest.TestCase):
 		customer.customer_group = "_Test Customer Group"
 		customer.insert()
 
+		#check whether lead contact is carried forward to the customer.
+		contact = frappe.db.get_value('Dynamic Link', {
+			"parenttype": "Contact",
+			"link_doctype": "Lead",
+			"link_name": customer.lead_name,
+		}, "parent")
+
+		if contact:
+			contact_doc = frappe.get_doc("Contact", contact)
+			self.assertEqual(contact_doc.has_link(customer.doctype, customer.name), True)
+
 	def test_make_customer_from_organization(self):
 		from erpnext.crm.doctype.lead.lead import make_customer
 

erpnext/selling/doctype/customer/customer.py

@@ -196,20 +196,19 @@ class Customer(TransactionBase):
 			if not lead.lead_name:
 				frappe.throw(_("Please mention the Lead Name in Lead {0}").format(self.lead_name))
 
-			if lead.company_name:
-				contact_names = frappe.get_all('Dynamic Link', filters={
-									"parenttype":"Contact",
-									"link_doctype":"Lead",
-									"link_name":self.lead_name
-								}, fields=["parent as name"])
-
-				for contact_name in contact_names:
-					contact = frappe.get_doc('Contact', contact_name.get('name'))
-					if not contact.has_link('Customer', self.name):
-						contact.append('links', dict(link_doctype='Customer', link_name=self.name))
-						contact.save(ignore_permissions=self.flags.ignore_permissions)
+			contact_names = frappe.get_all('Dynamic Link', filters={
+								"parenttype":"Contact",
+								"link_doctype":"Lead",
+								"link_name":self.lead_name
+							}, fields=["parent as name"])
 
-			else:
+			for contact_name in contact_names:
+				contact = frappe.get_doc('Contact', contact_name.get('name'))
+				if not contact.has_link('Customer', self.name):
+					contact.append('links', dict(link_doctype='Customer', link_name=self.name))
+					contact.save(ignore_permissions=self.flags.ignore_permissions)
+
+			if not contact_names:
 				lead.lead_name = lead.lead_name.lstrip().split(" ")
 				lead.first_name = lead.lead_name[0]
 				lead.last_name = " ".join(lead.lead_name[1:])