[IMP] contract_variable_quantity: Add option to don't create zero qty invoice lines

contract_variable_quantity/models/contract.py

@@ -1,13 +1,20 @@
-# © 2016 Pedro M. Baeza <pedro.baeza@tecnativa.com>
+# Copyright 2016 Tecnativa - Pedro M. Baeza
+# Copyright 2018 Tecnativa - Carlos Dauden
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
 
 from odoo import _, api, fields, models, exceptions
+from odoo.tools import float_is_zero
 from odoo.tools.safe_eval import safe_eval
 
 
 class AccountAnalyticAccount(models.Model):
     _inherit = "account.analytic.account"
 
+    skip_zero_qty = fields.Boolean(
+        string='Skip Zero Qty Lines',
+        help="If checked, contract lines with 0 qty don't create invoice line",
+    )
+
     @api.model
     def _prepare_invoice_line(self, line, invoice_id):
         vals = super(AccountAnalyticAccount, self)._prepare_invoice_line(
@@ -23,7 +30,14 @@ class AccountAnalyticAccount(models.Model):
             }
             safe_eval(line.qty_formula_id.code.strip(), eval_context,
                       mode="exec", nocopy=True)  # nocopy for returning result
-            vals['quantity'] = eval_context.get('result', 0)
+            qty = eval_context.get('result', 0)
+            if self.skip_zero_qty and float_is_zero(
+                    qty, self.env['decimal.precision'].precision_get(
+                    'Product Unit of Measure')):
+                # Return empty dict to skip line create
+                vals = {}
+            else:
+                vals['quantity'] = qty
         return vals