[FIX] estate: fix default value for the "date_availability" field in "estate_property" model

- Use a lambda function in order to recompute the default value for each record.
Before this change, the default was computed once (on server launch).

Author: robal-odoo

estate/models/estate_property.py

@@ -12,7 +12,7 @@ class EstateProperty(models.Model):
     name = fields.Char(string="Title", required=True)
     description = fields.Text()
     postcode = fields.Char()
-    date_availability = fields.Date(string="Available From", default=fields.Date.today() + relativedelta(months=3), copy=False)
+    date_availability = fields.Date(string="Available From", default=lambda self: fields.Date.context_today(self) + relativedelta(months=3), copy=False)
     expected_price = fields.Float(required=True)
     selling_price = fields.Float(readonly=True, copy=False)
     bedrooms = fields.Integer(default=2)