Mongoose create multiple objects in a array with partial success

Question

There's a method Model#create in a Mongoose to which I can send an array of objects.

var items = [{id: 1},{id: 2},{id: 3},{id: 4}];
Model.create(array, function (err, succededItems) {
   ...
});

Everything works fine except behavior when some of the objects which I try to create failed to be saved. In this scenario in err object I get, there're details about first object which has been failed, and in succededItems I get an array of the objects which have been saved.

I doubt is it possible to get in err or other way, an array which objects failed to save and reason, why did this happen?

Thank you in advance.

Ivan Drinchev · Accepted Answer · 2017-08-03 15:16:52Z

2

Unfortunately Mongoose returns only the first error, so your best option would be to use a combination of promises :

Promise
    .all( items.map( item => {
         return Model.create( item ) 
                     .catch( error => ( { error } ) )
    }) )
    .then( items => {

         items.forEach( item => {
             if ( item.error ) {
                console.log( "Item has failed with error", item.error );
             } else {
                console.log( "Item created successfully" );
             }
         } );

    } );

answered Aug 3, 2017 at 15:16

Ivan Drinchev

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