[IMP] mrp_tag: add parent tags

mrp_tag/models/mrp_tag.py

@@ -4,19 +4,54 @@
 
 from random import randint
 
-from odoo import fields, models
+from odoo import _, api, fields, models
+from odoo.exceptions import ValidationError
 
 
 class MrpTag(models.Model):
     _name = "mrp.tag"
     _description = "MRP Tag"
+    _parent_store = True
 
     def _get_default_color(self):
         return randint(1, 11)
 
     name = fields.Char("Tag Name", required=True, translate=True)
-    color = fields.Integer("Tag Color", default=_get_default_color)
+    color = fields.Integer(default=lambda self: self._get_default_color())
+    parent_id = fields.Many2one("purchase.tag", index=True, ondelete="cascade")
+    child_ids = fields.One2many("purchase.tag", "parent_id")
+    parent_path = fields.Char(index=True)
 
     _sql_constraints = [
         ("tag_name_uniq", "unique (name)", "Tag name already exists !"),
     ]
+
+    def name_get(self):
+        res = []
+        for tag in self:
+            names = []
+            current = tag
+            while current:
+                names.append(current.name)
+                current = current.parent_id
+            res.append((tag.id, " / ".join(reversed(names))))
+        return res
+
+    @api.model
+    def _name_search(
+        self, name="", args=None, operator="ilike", limit=100, name_get_uid=None
+    ):
+        if name:
+            args = [("name", operator, name.split(" / ")[-1])] + list(args or [])
+        return super()._name_search(
+            name=name,
+            args=args,
+            operator=operator,
+            limit=limit,
+            name_get_uid=name_get_uid,
+        )
+
+    @api.constrains("parent_id")
+    def _check_parent_recursion(self):
+        if not self._check_recursion("parent_id"):
+            raise ValidationError(_("Tags cannot be recursive."))