javascript - MongoDB: Set $unset with empty parameter gives 409 error -


i try set or unset values dynamically. have both, not always. do:

collection.update(     { _id: id },      {          $set: data,          $unset: remove      },      function (error) {          console.warn(error);     } );

this working, if data , remove set. there isn't have removed. if remove = {}, 409 error, remove empty.

how have improve update?

you need check size of remove object before passing in:

var update = {     $set: data }  if (object.keys(remove).length > 0) {     update['$unset'] = remove; }  collection.update(     { _id: id },      update,      function (error) {          console.warn(error);     } );

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