feat: Include child item group products in Item Group Page & cleanup

- Added 'Include descendants' checkbox, which will pull child item group products too
- Build item group filters in query engine file
- Include logic in filter engine
- Clean up Website section of Item Group page (UX)
- Add util to fetch child item groups including self

erpnext/e_commerce/api.py

@@ -48,7 +48,6 @@ def get_product_filter_data(query_args=None):
 
 	sub_categories = []
 	if item_group:
-		field_filters['item_group'] = item_group
 		sub_categories = get_child_groups_for_website(item_group, immediate=True)
 
 	engine = ProductQuery()

erpnext/e_commerce/product_data_engine/filters.py

@@ -14,6 +14,8 @@ class ProductFiltersBuilder:
 		self.item_group = item_group
 
 	def get_field_filters(self):
+		from erpnext.setup.doctype.item_group.item_group import get_child_groups_for_website
+
 		if not self.item_group and not self.doc.enable_field_filters:
 			return
 
@@ -25,18 +27,26 @@ class ProductFiltersBuilder:
 		fields = [item_meta.get_field(field) for field in filter_fields if item_meta.has_field(field)]
 
 		for df in fields:
-			item_filters, item_or_filters = {}, []
+			item_filters, item_or_filters = {"published_in_website": 1}, []
 			link_doctype_values = self.get_filtered_link_doctype_records(df)
 
 			if df.fieldtype == "Link":
 				if self.item_group:
-					item_or_filters.extend([
-						["item_group", "=", self.item_group],
-						["Website Item Group", "item_group", "=", self.item_group] # consider website item groups
-					])
+					include_child = frappe.db.get_value("Item Group", self.item_group, "include_descendants")
+					if include_child:
+						include_groups = get_child_groups_for_website(self.item_group, include_self=True)
+						include_groups = [x.name for x in include_groups]
+						item_or_filters.extend([
+							["item_group", "in", include_groups],
+							["Website Item Group", "item_group", "=", self.item_group] # consider website item groups
+						])
+					else:
+						item_or_filters.extend([
+							["item_group", "=", self.item_group],
+							["Website Item Group", "item_group", "=", self.item_group] # consider website item groups
+						])
 
 				# Get link field values attached to published items
-				item_filters['published_in_website'] = 1
 				item_values = frappe.get_all(
 					"Item",
 					fields=[df.fieldname],

erpnext/e_commerce/product_data_engine/query.py

@@ -46,10 +46,10 @@ class ProductQuery:
 		self.filter_with_discount = bool(fields.get("discount"))
 		result, discount_list, website_item_groups, cart_items, count = [], [], [], [], 0
 
-		website_item_groups = self.get_website_item_group_results(item_group, website_item_groups)
-
 		if fields:
 			self.build_fields_filters(fields)
+		if item_group:
+			self.build_item_group_filters(item_group)
 		if search_term:
 			self.build_search_filters(search_term)
 		if self.settings.hide_variants:
@@ -61,8 +61,6 @@ class ProductQuery:
 		else:
 			result, count = self.query_items(start=start)
 
-		result = self.combine_web_item_group_results(item_group, result, website_item_groups)
-
 		# sort combined results by ranking
 		result = sorted(result, key=lambda x: x.get("ranking"), reverse=True)
 
@@ -167,6 +165,25 @@ class ProductQuery:
 				# `=` will be faster than `IN` for most cases
 				self.filters.append([field, "=", values])
 
+	def build_item_group_filters(self, item_group):
+		"Add filters for Item group page and include Website Item Groups."
+		from erpnext.setup.doctype.item_group.item_group import get_child_groups_for_website
+		item_group_filters = []
+
+		item_group_filters.append(["Website Item", "item_group", "=", item_group])
+		# Consider Website Item Groups
+		item_group_filters.append(["Website Item Group", "item_group", "=", item_group])
+
+		if frappe.db.get_value("Item Group", item_group, "include_descendants"):
+			# include child item group's items as well
+			# eg. Group Node A, will show items of child 1 and child 2 as well
+			# on it's web page
+			include_groups = get_child_groups_for_website(item_group, include_self=True)
+			include_groups = [x.name for x in include_groups]
+			item_group_filters.append(["Website Item", "item_group", "in", include_groups])
+
+		self.or_filters.extend(item_group_filters)
+
 	def build_search_filters(self, search_term):
 		"""Query search term in specified fields
 
@@ -190,19 +207,6 @@ class ProductQuery:
 		for field in search_fields:
 			self.or_filters.append([field, "like", search])
 
-	def get_website_item_group_results(self, item_group, website_item_groups):
-		"""Get Web Items for Item Group Page via Website Item Groups."""
-		if item_group:
-			website_item_groups = frappe.db.get_all(
-				"Website Item",
-				fields=self.fields + ["`tabWebsite Item Group`.parent as wig_parent"],
-				filters=[
-					["Website Item Group", "item_group", "=", item_group],
-					["published", "=", 1]
-				]
-			)
-		return website_item_groups
-
 	def add_display_details(self, result, discount_list, cart_items):
 		"""Add price and availability details in result."""
 		for item in result:
@@ -278,16 +282,6 @@ class ProductQuery:
 
 		return []
 
-	def combine_web_item_group_results(self, item_group, result, website_item_groups):
-		"""Combine results with context of website item groups into item results."""
-		if item_group and website_item_groups:
-			items_list = {row.name for row in result}
-			for row in website_item_groups:
-				if row.wig_parent not in items_list:
-					result.append(row)
-
-		return result
-
 	def filter_results_by_discount(self, fields, result):
 		if fields and fields.get("discount"):
 			discount_percent = frappe.utils.flt(fields["discount"][0])