[fix] added ignore_in_install flag to accommodate Gcal custom field (#5455)

frappe/data_migration/doctype/data_migration_plan/data_migration_plan.py

@@ -30,6 +30,7 @@ class DataMigrationPlan(Document):
 				create_init_py(get_module_path(self.module), dt, dn)
 
 	def make_custom_fields_for_mappings(self):
+		frappe.flags.ignore_in_install = True
 		label = self.name + ' ID'
 		fieldname = frappe.scrub(label)
 
@@ -51,6 +52,7 @@ class DataMigrationPlan(Document):
 
 		# Create custom field in Deleted Document
 		create_custom_field('Deleted Document', df)
+		frappe.flags.ignore_in_install = False
 
 	def pre_process_doc(self, mapping_name, doc):
 		module = self.get_mapping_module(mapping_name)

frappe/installer.py

@@ -108,6 +108,8 @@ def get_root_connection(root_login='root', root_password=None):
 
 def install_app(name, verbose=False, set_as_patched=True):
 	frappe.flags.in_install = name
+	frappe.flags.ignore_in_install = False
+
 	frappe.clear_cache()
 	app_hooks = frappe.get_hooks(app_name=name)
 	installed_apps = frappe.get_installed_apps()

frappe/model/db_schema.py

@@ -230,7 +230,7 @@ class DbTable:
 					'fieldtype': 'Text'
 				})
 
-		if not frappe.flags.in_install_db and frappe.flags.in_install != "frappe":
+		if not frappe.flags.in_install_db and (frappe.flags.in_install != "frappe" or frappe.flags.ignore_in_install):
 			custom_fl = frappe.db.sql("""\
 				SELECT * FROM `tabCustom Field`
 				WHERE dt = %s AND docstatus < 2""", (self.doctype,), as_dict=1)