beforeSave renders Relation column on object invalid on response.success() #1714

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Environment Setup

using:
"parse": "~1.8.0",
"parse-server": "2.2.7"

I had the bug filed here parse-community/Parse-SDK-iOS-OSX#911
but I see now this is more of a bug in the cloud-code part of parse-server.

Steps to reproduce

Apparently the problem occurs when a beforeSave cloud function returns response.success() instead of response.success(request.object). When using the former on an object that contains a PFRelation, that PFRelation get's screwed up on the client side (becomes PFRelationOperation).

Unfortunately just using response.success(request.object) is not the solution. Using this will keep the PFRelation field intact but it will not save any data defined in the cloud function beforeSave method.

Here MyObject will not save (or create) the 'colorstring' column.

Parse.Cloud.beforeSave('MyObject', function(request, response) {
    request.object.set('colorstring', 'green');
        return response.success(request.object);
});

Here MyObject will save (or create) the 'colorstring' column and it will show up on the dashboard. But will render any PFRelation column on MyObject useless.

Parse.Cloud.beforeSave('MyObject', function(request, response) {
    request.object.set('colorstring', 'green');
        return response.success();
});

this issue seems to be similar: #1606

Logs/Trace