first commit

modules/party/category.py

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+# This file is part of Tryton.  The COPYRIGHT file at the top level of
+# this repository contains the full copyright notices and license terms.
+from sql.conditionals import Coalesce
+from sql.operators import Equal
+
+from trytond.model import (
+    DeactivableMixin, Exclude, ModelSQL, ModelView, fields, tree)
+
+
+class Category(DeactivableMixin, tree(separator=' / '), ModelSQL, ModelView):
+    __name__ = 'party.category'
+    name = fields.Char(
+        "Name", required=True, translate=True,
+        help="The main identifier of the category.")
+    parent = fields.Many2One(
+        'party.category', "Parent",
+        help="Add the category below the parent.")
+    childs = fields.One2Many(
+        'party.category', 'parent', "Children",
+        help="Add children below the category.")
+
+    @classmethod
+    def __setup__(cls):
+        super().__setup__()
+        t = cls.__table__()
+        cls._sql_constraints = [
+            ('name_parent_exclude',
+                Exclude(t, (t.name, Equal), (Coalesce(t.parent, -1), Equal)),
+                'party.msg_category_name_unique'),
+            ]
+        cls._order.insert(0, ('name', 'ASC'))