I want to perform a find query to MongoDB to check whether a particular entry is in DB or not. But it calls a callback function which is asynchronous. How can I get the result?
In this I am not getting the actual result synchronously.
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Can you post the sample code ? Are you directly using the node.js MongoDB driver ? or you are using anything like Mongoose ?Samyak Bhuta– Samyak Bhuta2011-11-30 09:16:33 +00:00Commented Nov 30, 2011 at 9:16
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1 Answer
If you are using Node.js you ought to do it the asynchronous way.
Example:
db_call(query, function (err, result) {
if (err) { throw new Error('db_error'); return; }
console.log(result); // do your stuff here
});
2 Comments
Shilpi
I am using the same way like: function authenticateUser(msg) { var result = true; db.open(function (error, client) { if (error) throw error; var collection = new mongodb.Collection(client, 'users'); collection.find({'key':msg}).toArray(function(err, docs) { log.info(docs.length); if(docs.length != 1) result = false; }); }); return result; } In this case I am not getting result value when I call this authenticate method.As we do not know when callback will be fired.
Samyak Bhuta
right place to post your code would be in the original question and not in comment section. If there is a lot of code you can use gist.github.com.