[FIX] web: add support for editable=top/bottom in o2m

Before this commit, we lost the functionality of editing records top or
bottom.  However, it as almost ready, but we needed to change the way
commands are generated, to respect the actual order in the UI.

Also, the mock server needed to be updated, to make sure he also save
the new ids in the correct order.

1 files changed, 2 insertions, 2 deletions

diff --git a/addons/web/static/src/js/fields/relational_fields.js b/addons/web/static/src/js/fields/relational_fields.js
index c7ff956fd7b..496aaee06f0 100644
--- a/addons/web/static/src/js/fields/relational_fields.js
+++ b/addons/web/static/src/js/fields/relational_fields.js
@@ -777,8 +777,8 @@ var FieldOne2Many = FieldX2Many.extend({
         return this._super.apply(this, arguments).then(function () {
             if (event && event.target === self && self.view.arch.tag === 'tree') {
                 if (event.data.changes[self.name].operation === 'CREATE') {
-                    // todo: get last record if editable = bottom
-                    var newID = self.value.data[0].id;
+                    var index = self.editable === 'top' ? 0 : self.value.data.length - 1;
+                    var newID = self.value.data[index].id;
                     self.renderer.editRecord(newID);
                 }
             }