“cursor.toArray is not a function””collection.find() accepts at most two arguments””unhandled promise rejections are deprecated” while using .find()

I am new to node js and currently i am practicing mongoDB via mongoose 6.0. Here i am getting this error on find method while trying to search the database:

There was an error
TypeError: cursor.toArray is not a function
    at model.Query.<anonymous> (C:UsersIshanDesktopWeb DevBackend lulFruitsProjectnode_modulesmongooselibquery.js:2151:19)
    at model.Query._wrappedThunk [as _find] (C:UsersIshanDesktopWeb DevBackend lulFruitsProjectnode_modulesmongooselibhelpersquerywrapThunk.js:27:8)
    at C:UsersIshanDesktopWeb DevBackend lulFruitsProjectnode_moduleskareemindex.js:370:33
    at processTicksAndRejections (internal/process/task_queues.js:77:11)
(node:13720) UnhandledPromiseRejectionWarning: MongoInvalidArgumentError: Method "collection.find()" accepts at most two arguments
    at Collection.find (C:UsersIshanDesktopWeb DevBackend lulFruitsProjectnode_modulesmongoosenode_modulesmongodblibcollection.js:238:19)
    at NativeCollection.<computed> [as find] (C:UsersIshanDesktopWeb DevBackend lulFruitsProjectnode_modulesmongooselibdriversnode-mongodb-nativecollection.js:191:33)
    at NativeCollection.Collection.doQueue (C:UsersIshanDesktopWeb DevBackend lulFruitsProjectnode_modulesmongooselibcollection.js:135:23)
    at C:UsersIshanDesktopWeb DevBackend lulFruitsProjectnode_modulesmongooselibcollection.js:82:24
    at processTicksAndRejections (internal/process/task_queues.js:77:11)
(Use `node --trace-warnings ...` to show where the warning was created)
(node:13720) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--u
terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
(node:13720) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

while trying to read from the database using collection.find() method.

const mongoose = require('mongoose');

mongoose.connect("mongodb://localhost:27017/fruitsDB", {useNewUrlParser: true})

const fruitSchema = new mongoose.Schema ({
  name: String,
  rating: Number,
  review: String
});

const Fruit = mongoose.model("Fruit", fruitSchema); //creates collection

const fruit= new Fruit({
  name: "Apple",
  rating: 7,
  review: "good"
});

const kiwi= new Fruit({
  name: "kiwi",
  rating: 7,
  review: "good"
});

const banana= new Fruit({
  name: "banana",
  rating: 7,
  review: "good"
});

// Fruit.insertMany([kiwi,banana],function(err){
//   if (err){
//     console.log(err);
//   }
//   else{
//     console.log("Successfully inserted");
//   }
// })
//

Fruit.find(function(err, fruits){ //shows error right here
  if(err){
    console.log("There was an error");
    console.log(err);
  }else{
    console.log(fruits);
  }
}); 


i even tried downgrading the mongoose version but it still showed the same error. The insertion works fine as i practiced it first and later on added that “find” method.

Answer

Try installing Version 5.13.8 of mongoose. I had the same problem with 6.0.1