Initial import from Docker volume

tests/mptt.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.
+"Test for Tree"
+from sql import Null
+from sql.conditionals import Case
+
+from trytond.model import DeactivableMixin, ModelSQL, ModelView, fields, tree
+from trytond.pool import Pool
+
+
+class MPTT(DeactivableMixin, tree(), ModelSQL, ModelView):
+    'Modified Preorder Tree Traversal'
+    __name__ = 'test.mptt'
+    name = fields.Char('Name', required=True)
+    parent = fields.Many2One('test.mptt', "Parent", left="left", right="right")
+    left = fields.Integer('Left', required=True)
+    right = fields.Integer('Right', required=True)
+    childs = fields.One2Many('test.mptt', 'parent', 'Children')
+
+    @staticmethod
+    def order_sequence(tables):
+        table, _ = tables[None]
+        return [Case((table.sequence == Null, 0), else_=1), table.sequence]
+
+    @staticmethod
+    def default_left():
+        return 0
+
+    @staticmethod
+    def default_right():
+        return 0
+
+
+def register(module):
+    Pool.register(
+        MPTT,
+        module=module, type_='model')