How to get all count of mongoose model

Question

How can I know the count of a model that data has been saved  there is a method of Model count    but it doesn t seem to work            var db   mongoose connect  mongodb   localhost myApp    var userSchema   new Schema  name String password String    userModel  db model  UserList  userSchema           var userCount   userModel count  name      userCount is an Object  which method called can get a real count   Thanks

User · Accepted Answer

The code below works  Note the use of countDocuments    var mongoose   require  mongoose     var db   mongoose connect  mongodb   localhost myApp     var userSchema   new mongoose Schema  name String password String     var userModel  db model  userlists  userSchema    var anand   new userModel   name   anand   password   abcd      anand save function  err  docs       if  err           console log  Error         else          userModel countDocuments  name   anand    function err  c               console log  Count is     c

User · Answer

As said before  you code will not work the way it is   A solution to that would be using a callback function  but if you think it would carry you to a  Callback hell   you can search for   Promisses     A possible solution using a callback function     DECLARE  numberofDocs OUT OF FUNCTIONS      var  numberofDocs       userModel count     setNumberofDocuments     this search all DOcuments in a Collection   if you want to search the number of documents based on a query  you can do this    userModel count  yourQueryGoesHere   setNumberofDocuments     setNumberofDocuments is a separeted function    var setNumberofDocuments   function err  count            if err  return handleError err            numberofDocs   count              Now you can get the number of Documents anywhere with a getFunction         function getNumberofDocs               return numberofDocs             var number   getNumberofDocs      In addition   you use this asynchronous function inside a synchronous one by using a callback  example   function calculateNumberOfDoc someParameter  setNumberofDocuments           userModel count     setNumberofDocuments     this search all DOcuments in a Collection         setNumberofDocuments true          Hope it can help others

User · Answer

The collection count is deprecated  and will be removed in a future version  Use collection countDocuments or collection estimatedDocumentCount instead   userModel countDocuments query  exec  err  count    gt        if  err            res send err           return             res json   count  count

User · Answer

The reason your code doesn t work is because the count function is asynchronous  it doesn t synchronously return a value     Here s an example of usage   userModel count     function  err  count       console log   Number of users    count

User · Answer

Background for the solution As stated in the mongoose documentation and in the answer by Benjamin  the method Model count   is deprecated  Instead of using count    the alternatives are the following  Model countDocuments filterObject  callback  Counts how many documents match the filter in a collection  Passing an empty object    as filter executes a full collection scan  If the collection is large  the following method might be used  Model estimatedDocumentCount   This model method estimates the number of documents in the MongoDB collection  This method is faster than the previous countDocuments    because it uses collection metadata instead of going through the entire collection  However  as the method name suggests  and depending on db configuration  the result is an estimate as the metadata might not reflect the actual count of documents in a collection at the method execution moment  Both methods return a mongoose query object  which can be executed in one of the following two ways  Use  exec   if you want to execute a query at a later time  The solution Option 1  Pass a callback function For example  count all documents in a collection using  countDocuments    someModel countDocuments     function err  docCount        if  err    return handleError err      handle possible errors     console log docCount        and do some other fancy stuff     Or  count all documents in a collection having a certain name using  countDocuments    someModel countDocuments   name   Snow     function err  docCount          see other example    Option 2  Use  then   A mongoose query has  then   so it   s    thenable     This is for a convenience and query itself is not a promise  For example  count all documents in a collection using  estimatedDocumentCount    someModel      estimatedDocumentCount        then docCount   gt            console log docCount            and do one super neat trick             catch err   gt              handle possible errors         Option 3  Use async await When using async await approach  the recommended way is to use it with  exec   as it provides better stack traces  const docCount   await someModel countDocuments     exec     Learning by stackoverflowing

User · Answer

The highest voted answers here are perfectly fine I just want to add up the use of await so that the functionality asked for can be archived   const documentCount   await userModel count      console log   Number of users    documentCount      It s recommended to use countDocuments   over  count    as it will be deprecated going on  So  for now  the perfect code would be   const documentCount   await userModel countDocuments      console log   Number of users    documentCount

User · Answer

You should give an object as argument  userModel count  name   sam       or   userModel count  name   sam    exec      if you are using promise   or   userModel count         if you want to get all counts irrespective of the fields   On the recent version of mongoose  count   is deprecated so use   userModel countDocuments  name   sam

User · Answer

Using mongoose js you can count documents   count all  const count   await Schema countDocuments      count specific  const count   await Schema countDocuments   key  value

[node.js] How to get all count of mongoose model?

Examples related to node.js

Examples related to mongodb

Examples related to mongoose