refactor: add import guard for erpnext

payments/payment_gateways/doctype/mpesa_settings/mpesa_settings.py

@@ -14,6 +14,7 @@
 from payments.payment_gateways.doctype.mpesa_settings.mpesa_custom_fields import (
 	create_custom_pos_fields,
 )
+from payments.utils import erpnext_app_import_guard
 
 
 class MpesaSettings(Document):
@@ -354,7 +355,8 @@ def fetch_param_value(response, key, key_field):
 
 
 def create_mode_of_payment(gateway, payment_type="General"):
-	from erpnext import get_default_company
+	with erpnext_app_import_guard():
+		from erpnext import get_default_company
 
 	payment_gateway_account = frappe.db.get_value(
 		"Payment Gateway Account", {"payment_gateway": gateway}, ["payment_account"]

payments/utils/__init__.py

@@ -4,4 +4,5 @@
 	delete_custom_fields,
 	get_payment_gateway_controller,
 	make_custom_fields,
+	erpnext_app_import_guard,
 )

payments/utils/utils.py

@@ -1,6 +1,7 @@
 import click
 import frappe
 from frappe import _
+from contextlib import contextmanager
 from frappe.custom.doctype.custom_field.custom_field import create_custom_fields
 
 
@@ -188,3 +189,16 @@ def before_install():
 	# a lot of apis don;t exist in v10 and this is a (at the moment) required app for erpnext.
 	if not frappe.get_meta("Module Def").has_field("custom"):
 		return False
+
+
+@contextmanager
+def erpnext_app_import_guard():
+	marketplace_link = '<a href="https://frappecloud.com/marketplace/apps/erpnext">Marketplace</a>'
+	github_link = '<a href="https://github.com/frappe/erpnext">GitHub</a>'
+	msg = _("erpnext app is not installed. Please install it from {} or {}").format(
+		marketplace_link, github_link
+	)
+	try:
+		yield
+	except ImportError:
+		frappe.throw(msg, title=_("Missing ERPNext App"))