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Why findRandom() mongoose for node.js method doesn't work?


Why findRandom() mongoose for node.js method doesn't work?

By : Usman Qamar
Date : November 14 2020, 04:51 PM
this one helps. And probably solution could be here - see the comments on npm page mongoose-random example .
code :
// if you have an existing collection, it must first by synced.
// this will add random data for the `path` key for each doc.
productSchema.syncRandom(function (err, result) {
   console.log(result.updated);
});


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Sorting in Mongoose doesnt work correctly

Sorting in Mongoose doesnt work correctly


By : Jun Yeal Lim
Date : March 29 2020, 07:55 AM
Any of those help Based on your error message you must be using Mongoose 3.x, however you're using the 2.x sort method parameter style. Either switch to the 2.7.0 Mongoose release or change your sort usage to sort('created_at'). From the 3.x source:
code :
/**
* sort
*
* Sets the sort order. Accepts a single parameter, either an object or string.
* If an object is passed values allowed are 'asc', 'desc', 'ascending', 'descending', 1, -1.
* If a string is passed it must be a space delimited list of path names. The sort order of each path is ascending unless the path name is prefixed with `-` which will be treated as descending.
*
* Examples:
*
* // these are equivalent
* query.sort({ field: 'asc', test: -1 });
* query.sort('field -test');
*
* @param {Object|String}
* @api public
*/
mongoose query doesnt work in node.js but works in mongo shell

mongoose query doesnt work in node.js but works in mongo shell


By : user3065655
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further Confusingly, mongoose.Schema.ObjectId is not the ObjectID constructor function, it's only meant to be used in defining schemas.
But you don't need to create an ObjectID from that string anyway because Mongoose will do that for you based on the schema definition, so you can simply use:
code :
DB.TodoTable.find({ "userId": "54c12f5f3620c07019e6b144" }, function(err, todos) {...})
DB.TodoTable.find({ "userId": mongoose.mongo.ObjectID("54c12f5f3620c07019e6b144") }, 
    function(err, todos) {...})
aggregation mongoose nodejs $match doesnt work

aggregation mongoose nodejs $match doesnt work


By : Howard Dennis
Date : March 29 2020, 07:55 AM
should help you out You have messed up both $lookup and $match stage. And also you didn't cast your ally_id from String to mongoose ObjectId
It should be something like
code :
db.aggregate([
  { "$match": { "ally_id": mongoose.Types.ObjectId(alliance._id) } },
  { "$lookup": {
    "from": "users",
    "localField": "user_id",
    "foreignField": "_id",
    "as": "users"
  }}
])
Mongoose connect method fails on simple Node Server. Express, Mongoose, Path

Mongoose connect method fails on simple Node Server. Express, Mongoose, Path


By : Akila Rathnavel
Date : March 29 2020, 07:55 AM
I wish did fix the issue. You need to actually successfully get mongod running and listening for connections. Just type mongod with no options, hit ENTER, and let it run. Then in a separate terminal start your express app. Note that mongod is the mongodb server daemon whereas mongo is the command line client where you can run an interactive REPL and issue database commands.
Mongoose discriminator doesnt work with embedded collection

Mongoose discriminator doesnt work with embedded collection


By : hello
Date : March 29 2020, 07:55 AM
This might help you I think you should use discriminator on Funnel model and then on saving it will include discriminated fields, like just after creating Funner model, we can define discriminator:
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