Set prefered contact email in Employee

erpnext/hr/doctype/salary_slip/test_salary_slip.py

@@ -143,6 +143,8 @@ class TestSalarySlip(unittest.TestCase):
 				"department": frappe.get_all("Department", fields="name")[0].name,
 				"gender": "Female",
 				"company_email": user,
+				"prefered_contact_email": "Company Email",
+				"prefered_email": user,
 				"status": "Active",
 				"employment_type": "Intern"
 			}).insert()

erpnext/patches.txt

@@ -339,3 +339,4 @@ finally:erpnext.patches.v7_0.update_timesheet_communications
 erpnext.patches.v7_0.update_status_of_zero_amount_sales_order
 erpnext.patches.v7_1.add_field_for_task_dependent
 erpnext.patches.v7_0.repost_bin_qty_and_item_projected_qty
+erpnext.patches.v7_1.set_prefered_contact_email

erpnext/patches/v7_1/set_prefered_contact_email.py

@@ -0,0 +1,19 @@
+from __future__ import unicode_literals
+import frappe
+
+def execute():
+	for d in frappe.get_all("Employee"):
+		employee = frappe.get_doc("Employee", d.name)
+		if employee.company_email:
+			employee.prefered_contact_email = "Company Email"
+			employee.prefered_email = employee.company_email
+		elif employee.personal_email:
+			employee.prefered_contact_email = "Personal Email"
+			employee.prefered_email = employee.personal_email
+		elif employee.user_id:
+			employee.prefered_contact_email = "User ID"
+			employee.prefered_email = employee.user_id
+		
+		employee.flags.ignore_mandatory = True
+		employee.flags.ignore_validate = True
+		employee.save()