diff --git a/shopinvader/models/shopinvader_variant.py b/shopinvader/models/shopinvader_variant.py
index 208f1caf9e..fc08d11eb5 100644
--- a/shopinvader/models/shopinvader_variant.py
+++ b/shopinvader/models/shopinvader_variant.py
@@ -289,11 +289,38 @@ def _get_price(
             )
         return res
 
+    @api.model
+    def _get_main_product_read_fields(cls):
+        product_model = cls.env["product.product"]
+        order_by = [x.strip() for x in product_model._order.split(",")]
+        return ["shopinvader_product_id", "backend_id", "lang_id"] + order_by
+
+    @api.model
+    def _get_main_product_sorted_variants(cls, variants):
+        # NOTE: if the order is changed by adding `asc/desc` this can be broken
+        # but it's very unlikely that the default order for product.product
+        # will be changed.
+        order_by = [x.strip() for x in cls.env["product.product"]._order.split(",")]
+
+        def get_value(record, key):
+            field_type = cls._fields[key].type
+            value = record[key]
+            if value is False and field_type in ("char", "text"):
+                return ""
+            else:
+                return value
+
+        return sorted(variants, key=lambda var: [get_value(var, x) for x in order_by])
+
+    @api.model
+    def _pick_main_variant(cls, variants):
+        ordered = cls._get_main_product_sorted_variants(variants)
+        return ordered[0].get("id") if ordered else None
+
     def _compute_main_product(self):
         # Respect same order.
-        order_by = [x.strip() for x in self.env["product.product"]._order.split(",")]
         backends = self.mapped("backend_id")
-        fields_to_read = ["shopinvader_product_id", "backend_id", "lang_id"] + order_by
+        fields_to_read = self._get_main_product_read_fields()
         product_ids = self.mapped("shopinvader_product_id").ids
         # Use sudo to bypass permissions (we don't care)
         _variants = self.sudo().search(
@@ -310,23 +337,8 @@ def _compute_main_product(self):
             lambda x: (x["shopinvader_product_id"], x["backend_id"], x["lang_id"]),
         )
 
-        def pick_1st_variant(variants):
-            # NOTE: if the order is changed by adding `asc/desc` this can be broken
-            # but it's very unlikely that the default order for product.product
-            # will be changed.
-            def get_value(record, key):
-                if record[key] is False and self._fields[key].type in ("char", "text"):
-                    return ""
-                else:
-                    return record[key]
-
-            ordered = sorted(
-                variants, key=lambda var: [get_value(var, x) for x in order_by]
-            )
-            return ordered[0].get("id") if ordered else None
-
         main_by_product = {
-            product: pick_1st_variant(tuple(variants))
+            product: self._pick_main_variant(variants)
             for product, variants in var_by_product
         }
         for record in self: