[ADD] agreement_maintenance

agreement_maintenance/models/agreement.py

@@ -0,0 +1,21 @@
+# Copyright (C) 2018 - TODAY, Open Source Integrators
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+from odoo import api, fields, models
+
+
+class Agreement(models.Model):
+    _inherit = "agreement"
+
+    mr_count = fields.Integer('# Maintenance Requests',
+                              compute='_compute_mr_count')
+
+    @api.multi
+    def _compute_mr_count(self):
+        data = self.env['maintenance.request'].read_group(
+            [('agreement_id', 'in', self.ids)],
+            ['agreement_id'], ['agreement_id'])
+        count_data = dict((item['agreement_id'][0],
+                           item['agreement_id_count']) for item in data)
+        for agreement in self:
+            agreement.mr_count = count_data.get(agreement.id, 0)