[FIX] web: correctly apply onchange on boolean field

When an onchange sets a boolean field to 'true', if this boolean was set to 'false'
previously, the old value was used instead of 'false'.

1 files changed, 1 insertions, 1 deletions

diff --git a/addons/web/static/src/js/views/basic/basic_model.js b/addons/web/static/src/js/views/basic/basic_model.js
index 6500fb43b85..7810a1195f0 100644
--- a/addons/web/static/src/js/views/basic/basic_model.js
+++ b/addons/web/static/src/js/views/basic/basic_model.js
@@ -1235,7 +1235,7 @@ var BasicModel = AbstractModel.extend({
                 record._rawChanges[name] = val;
                 return;
             }
-            var oldValue = record._changes[name] || record.data[name];
+            var oldValue = name in record._changes ? record._changes[name] : record.data[name];
             var id;
             if (field.type === 'many2one') {
                 id = false;