'fields' option modifies passed object

[Malgalad]

Suppose we have

var obj = {a: 1, b: 2, c: 3}

and we want to update some model with it but pick only specific fields, and then we want to update other model with the same object, but with different fields:

some_model.update(obj, {fields: ['a', 'b']});

other_model.update(obj, {fields: ['c']}) // Error: column 'c' cannot be null

console.log(obj); // {a: 1, b: 2};

What happened? - First update function picked fields a and b, but instead of working with a clone of obj, it modified it.

Is it intended behaviour? The obvious workaround would be to clone obj manually before passing it to update function, but I think this is not intuitive.

[janmeier]

Yeah, the value object should probably be cloned - PR welcome