How to use mongoose findOne

Question

I have the below schema  apologies that it is in coffeescript   Schema   mongoose Schema  AuthS   new Schema     auth     type  String  unique  true      nick    String     time    Date Auth   mongoose model  Auth   AuthS   I simply want to recover one record which is definitely in my database   Auth findOne  nick   noname    function obj    console log obj         Unfortunately this always logs null  db auths findOne  nick   noname    in mongo shell always returns a value  What is going on

User · Answer

In my case same error is there   I am using Asyanc   Await functions   for this   needs to add AWAIT for findOne  Ex const foundUser   User findOne     email    req body email       above   foundUser always contains Object value in both cases either user found or not because it s returning values before finishing findOne    const foundUser   await User findOne     email    req body email       above   foundUser returns null if user is not there in collection with provided condition   If user found returns user document

User · Answer

You might want to consider using console log with the built-in  arguments  object   console log arguments      would have shown you  0  null   1  yourResult   This will always output all of your arguments  no matter how many arguments you have

User · Answer

Mongoose basically wraps mongodb s api to give you a pseudo relational db api so queries are not going to be exactly like mongodb queries   Mongoose findOne query returns a query object  not a document   You can either use a callback as the solution suggests or as of v4  findOne returns a thenable so you can use  then or await async to retrieve the document      thenables Auth findOne  nick   noname    then err  result   console log result    Auth findOne  nick   noname    then function  doc   console log doc         To use a full fledge promise you will need to use  exec   var auth   Auth findOne  nick   noname    exec    auth then function  doc   console log doc         async await async function auth       const doc   await Auth findOne  nick   noname    exec      return doc    auth       See the docs if you would like to use a third party promise library

User · Answer

Use obj 0  nick and you will get desired result

User · Answer

Found the problem  need to use function err obj  instead   Auth findOne  nick   noname    function err obj    console log obj

[node.js] How to use mongoose findOne

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