[14.0][IMP] Query performance for shop route in website_sale_filter_p…

…roduct_brand

Qweb key `attr_valid` stores a list of product ids, which is exposed
to qContext

- Before this commit:

  Product ids list for `attr_valid` is built with ORM `mapped()`,
  which is very slow if you have a lot of products and attributes for
  products.

  (Tested with 15'000 products and around 500 values for different
  attributes)

  Depending on hardware, this might cause some annoying delay before
  the /shop page is loaded.

- After this commit:

  Product ids list for `attr_valid` is now built with a search domain
  on `product.attribute.value` model: this should improve load speed
  by a lot (about x35 times faster).

website_sale_filter_product_brand/controllers/website_sale.py

@@ -90,6 +90,24 @@ def shop(self, page=0, category=None, brand=None, ppg=False, search="", **post):
         )
         brands = self._remove_extra_brands(brands, search_products, attrib_values)
 
+        # use search() domain instead of mapped() for better performance:
+        # will basically search for product's related attribute values
+        attrib_valid_ids = (
+            request.env["product.attribute.value"]
+            .search(
+                [
+                    "&",
+                    (
+                        "pav_attribute_line_ids.product_tmpl_id",
+                        "in",
+                        search_products._ids,
+                    ),
+                    ("pav_attribute_line_ids.value_ids", "!=", False),
+                ]
+            )
+            .ids
+        )
+
         # keep selected brands in URL
         keep = QueryURL(
             "/shop",
@@ -105,9 +123,7 @@ def shop(self, page=0, category=None, brand=None, ppg=False, search="", **post):
             {
                 "brands": brands,
                 "selected_brand_ids": selected_brand_ids,
-                "attr_valid": search_products.mapped(
-                    "attribute_line_ids.value_ids"
-                ).ids,
+                "attr_valid": attrib_valid_ids,
                 "keep": keep,
             }
         )