[IMP] mrp_usability: improve smart button from products to BoMs

mrp_usability/models/product.py

@@ -0,0 +1,44 @@
+# Copyright (C) 2020 - Akretion
+# License AGPL-3 - See http://www.gnu.org/licenses/agpl-3.0.html
+
+from odoo import models
+
+
+class ProductTemplate(models.Model):
+    _inherit = "product.template"
+
+    def action_view_bom(self):
+        """Replace native action `template_open_bom` to distinguish if we will display
+        only one BoM form or a list of BoMs."""
+        self.ensure_one()
+
+        act_window_xml_id = "mrp.mrp_bom_form_action"
+        act_window = self.env.ref(act_window_xml_id).read()[0]
+        if self.bom_count > 1:
+            act_window["context"] = {
+                "default_product_tmpl_id": self.id,
+                "search_default_product_tmpl_id": self.id,
+            }
+        else:
+            act_window["context"] = {"default_product_tmpl_id": self.id}
+            act_window["views"] = [(self.env.ref("mrp.mrp_bom_form_view").id, "form")]
+            act_window["res_id"] = (
+                self.env["mrp.bom"].search([("product_tmpl_id", "=", self.id)]).id
+            )
+
+        return act_window
+
+
+class ProductProduct(models.Model):
+    _inherit = "product.product"
+
+    def action_view_bom(self):
+        res = super().action_view_bom()
+
+        bom_target_ids = self.env["mrp.bom"].search(res["domain"])
+
+        if len(bom_target_ids) == 1:
+            res["views"] = [(self.env.ref("mrp.mrp_bom_form_view").id, "form")]
+            res["res_id"] = bom_target_ids[0].id
+
+        return res