P.S., to find these things yourself, think about what "Error: writeConcern 
requires callback" means (probably that you're missing a callback for 
something that writes [only thing that writes here is menu.update]), and 
look at the documentation for 
mongoose http://mongoosejs.com/docs/api.html#document_Document-update.


On Friday, December 19, 2014 11:30:53 AM UTC-5, Gregory Edigarov wrote:
>
> Hello,
>
> Error: writeConcern requires callback
>     at updateWithWriteCommands 
> (/home/greg/nodejs-module/app/server/node_modules/mongoose/node_modules/mongodb/lib/mongodb/collection/core.js:530:11)
>     at Collection.update 
> (/home/greg/nodejs-module/app/server/node_modules/mongoose/node_modules/mongodb/lib/mongodb/collection/core.js:646:12)
>     at NativeCollection.(anonymous function) [as update] 
> (/home/greg/nodejs-module/app/server/node_modules/mongoose/lib/drivers/node-mongodb-native/collection.js:135:28)
>     at NodeCollection.update 
> (/home/greg/nodejs-module/app/server/node_modules/mongoose/node_modules/mquery/lib/collection/node.js:61:19)
>     at Query.update 
> (/home/greg/nodejs-module/app/server/node_modules/mongoose/node_modules/mquery/lib/mquery.js:1939:20)
>     at Query.update 
> (/home/greg/nodejs-module/app/server/node_modules/mongoose/lib/query.js:1760:28)
>     at Function.update 
> (/home/greg/nodejs-module/app/server/node_modules/mongoose/lib/model.js:1638:13)
>     at model.update 
> (/home/greg/nodejs-module/app/server/node_modules/mongoose/lib/document.js:367:34)
>     at onPostMenuUpdate 
> (/home/greg/nodejs-module/app/server/requests/postRequests.js:74:10)
>     at Layer.handle [as handle_request] 
> (/home/greg/nodejs-module/app/server/node_modules/express/lib/router/layer.js:82:5)
>
> the related function is:
>
> var onUpdate = function (err, num, raw) {
>     if (!err) {
>     logger.info('information stored');
>     return myResponse.send ({status: 'ok' });
>     } else {
>     logger.info (err);
>     if(err.name == 'ValidationError') {
>             myResponse.statusCode = 400;
>             myResponse.send({ error: 'Validation error'});
>             logger.info(req.body);
>         } else {
>             myResponse.statusCode = 500;
>             myResponse.send({ error: 'Server error' });
>         }
>     logger.error('internal error(%d):%s');
>     }
> }  
>  
>
> function onPostMenuUpdate (request,response) {
>    logger.info("In onPostMenuUpdate");
>     myResponse=response;
>     var menu = new model.MainMenuModel ({
>     'name': request.body.name,
>     'link': request.body.link,
>     'drop': request.body.drop
>     }); 
>     var menuObject=menu.toObject();
>     
>     menu.update({name:request.body.name}, menuObject, {upsert: true}, 
> onUpdate);
> }
>
> How can i avoid this error. 
>

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