[IMP] product: Empty company_id

On v13, there's no default company associated with the template nor the
pricelist, on contrary than on v12. We need to empty the company_id field in
case of having only one company for not having problems later when creating
new pricelists and not being able to select old products due to the
difference on the company_id field (on a pricelist without company, you can
only select templates without company, and vice versa, but not a mix of
both).

We need to empty the company of pricelists as well.

If there are more than one company in the DB, then everything is
preserved as it is.

TT29732

Author: pedrobaeza

addons/product/migrations/13.0.1.2/post-migration.py

@@ -61,6 +61,31 @@ def convert_image_attachments(env):
             Model.browse(attachment.res_id).image_1920 = attachment.datas
 
 
+@openupgrade.logging()
+def empty_template_pricelist_company(env):
+    """On v13, there's no default company associated with the template nor the
+    pricelist, on contrary than on v12. We need to empty the company_id field in
+    case of having only one company for not having problems later when creating
+    new pricelists and not being able to select old products due to the
+    difference on the company_id field (on a pricelist without company, you can
+    only select templates without company, and vice versa, but not a mix of
+    both).
+
+    We need to empty the company of pricelists as well.
+
+    If there are more than one company in the DB, then everything is
+    preserved as it is.
+    """
+    env.cr.execute("SELECT COUNT(*) FROM res_company")
+    if env.cr.fetchone()[0] == 1:
+        openupgrade.logged_query(
+            env.cr, "UPDATE product_template SET company_id = NULL WHERE company_id is NOT NULL",
+        )
+        openupgrade.logged_query(
+            env.cr, "UPDATE product_pricelist SET company_id = NULL WHERE company_id is NOT NULL",
+        )
+
+
 @openupgrade.migrate()
 def migrate(env, version):
     fill_product_template_attribute_value_attribute_line_id(env)
@@ -69,3 +94,4 @@ def migrate(env, version):
     openupgrade.load_data(
         env.cr, "product", "migrations/13.0.1.2/noupdate_changes.xml")
     convert_image_attachments(env)
+    empty_template_pricelist_company(env)