[Fix] Filter on child table not working in Calendar (#11824)

* use the new get_events method

* using the common get_events method for calendar_view

* using add_fetch to fill customer_name

erpnext/projects/doctype/task/task.py

@@ -148,30 +148,6 @@ def check_if_child_exists(name):
 	return frappe.db.sql("""select name from `tabTask`
 		where parent_task = %s""", name)
 
-@frappe.whitelist()
-def get_events(start, end, filters=None):
-	"""Returns events for Gantt / Calendar view rendering.
-
-	:param start: Start date-time.
-	:param end: End date-time.
-	:param filters: Filters (JSON).
-	"""
-	from frappe.desk.calendar import get_event_conditions
-	conditions = get_event_conditions("Task", filters)
-
-	data = frappe.db.sql("""select name, exp_start_date, exp_end_date,
-		subject, status, project from `tabTask`
-		where ((ifnull(exp_start_date, '0000-00-00')!= '0000-00-00') \
-				and (exp_start_date <= %(end)s) \
-			or ((ifnull(exp_end_date, '0000-00-00')!= '0000-00-00') \
-				and exp_end_date >= %(start)s))
-		{conditions}""".format(conditions=conditions), {
-			"start": start,
-			"end": end
-		}, as_dict=True, update={"allDay": 0})
-
-	return data
-
 def get_project(doctype, txt, searchfield, start, page_len, filters):
 	from erpnext.controllers.queries import get_match_cond
 	return frappe.db.sql(""" select name from `tabProject`

erpnext/projects/doctype/task/task_calendar.js

@@ -19,5 +19,5 @@ frappe.views.calendar["Task"] = {
 			"label": __("Project")
 		}
 	],
-	get_events_method: "erpnext.projects.doctype.task.task.get_events"
+	get_events_method: "frappe.desk.calendar.get_events"
 }