[MIG] contract_price_revision: Migration to 12.0

contract_price_revision/models/contract_line.py

@@ -0,0 +1,31 @@
+# Copyright 2019 Tecnativa - Vicent Cubells
+# Copyright 2019 Tecnativa - Carlos Dauden
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl.html).
+
+from odoo import api, fields, models
+import odoo.addons.decimal_precision as dp
+
+
+class ContractLine(models.Model):
+    _inherit = 'contract.line'
+
+    previous_price = fields.Float(
+        string='Previous price',
+        related='predecessor_contract_line_id.price_unit',
+        readonly=True,
+    )
+    variation_percent = fields.Float(
+        compute='_compute_variation_percent',
+        store=True,
+        digits=dp.get_precision('Product Price'),
+        string='Variation %',
+    )
+
+    @api.depends('price_unit', 'predecessor_contract_line_id.price_unit')
+    def _compute_variation_percent(self):
+        for line in self:
+            if line.price_unit and line.previous_price:
+                line.variation_percent = (
+                    (line.price_unit / line.previous_price - 1) * 100)
+            else:
+                line.variation_percent = 0.0