I need to fetch value as per some user input using MongoDB aggregate function but in my case, I could not return the right value. Here is my code:
var cname=req.body.cname;
var id=req.body.id;
Company.collection.aggregate([
{ $match:{$and:[{cname:cname},{_id:{$ne:id}}]}}
])
I need to fetch those value by comparing the cname value and _id is not equals to the given id. But In my case, the user input id value is fetching where I need other the user input id documents.
You need to change the query as mentioned below:
Company.collection.aggregate([
{ $match:{$and:[{cname:cname},{$ne:{_id:id}}]}}
]);
See if it helps!
You can try below code.
const ObjectId = require('mongodb').ObjectId;
Company.collection.aggregate([
{$match : {$and: [{cname:cname},{$ne:{'_id':ObjectId(id)}}]}}
]);
Related
I am fetching id column value from database for a particular email. In this case I am passing email and want to get primary key i.e id. This operation is successful as I get object which contains Object with the right and expected result. However I am not able to access the object.
I am receiving object like this:
[ UserInfo { id: 21 } ]
And I am not able to access id part of it.
I am using node.js, postgres for database and typeorm library to connect with database.
const id = await userRepo.find({
select:["id"],
where: {
email:email
}
});
console.log(id)
This prints the above object.
The id I am getting is right. But I am not able to retrieve the id part of the object. I tried various ways for e.g.
id['UserInfo'].id, id.UserInfo.
Please help me in accessing the object I am receiving
Typeorm .find() returns an array of objects containing entries corresponding to your filters, in your case, all entries with an email field corresponding to the email you specified.
Because the result is an array, you can access it this way:
const records = await userRepo.find({
select: ['id'],
where: {
email,
},
})
console.log(records[0].id)
You could also use the .findOne() method, which returns a single element and might be a better solution in your case :)
When you are putting a field in the select part select:["id"], you are only retrieving this part of the database.
It is like your query was this: select id from userRepo where email = email
and you need to put * in the select part to retrieve all the information:
const id = await userRepo.find({
select:["*"],
where: {
email:email
}
});
So I'm making a search bar in my app and I'm using mongodb to fetch the results.
The situation is as following:
When the _group property (which is an ObjectId) of the post document is equal to one of the values in the exampleArray I want this post to be included in my end result. How would I do this?
const exampleArray = ['ObjectId1', 'ObjectId1', 'ObjectId1'];
const posts = await Post.find({_group: exampleArray })
The query will need to use the MongoDB $in operator, which is used to compare a field against a list of values.
Try the following:
posts = await Post.find({_group: { "$in" : exampleArray } })
I'm having issues with mongoose queries.
I am trying to check if a object with an Id is in an array of objects.
So my query is like
db.getCollection('adunits').find(
{_id: ObjectId("5bd9bc1ca4efae39d0b5a58e")},
{$in : ["5bf510156c154934150ef006","5bf5309e6c154934150f00a6","5bd9b874a4efae39d0b5a58d","5bf52a876c154934150efe4a"]}
)
As you can see, my ObjectId("5bd9...") IS NOT in the array. But my query returns the document with ObjectId("5bd9...").
Isn't the $in operator supposed to check if the _id in parameter is IN the array?
I wish it could return me a "0 fetched documents" because the id passed isn't in the array.
Thanks in advance
Your query is not right.
You can either find by id like so:
db.getCollection('adunits')
.find({_id: ObjectId("5bd9bc1ca4efae39d0b5a58e")})
to get a single document or use $in operator like so
db.getCollection('adunits')
.find({_id: { $in: ["5bf510156c154934150ef006","5bf5309e6c154934150f00a6",...]})
which will return documents which have one of the ids provided in the array.
You query condition finds adunits where _id = ObjectId("5bd9bc1ca4efae39d0b5a58e"), it returns the value that matches given condition. While $in operator should applied on a filed. Are you trying to achieve some thing like, find the documents that matches ids in given array.if yes , change your code to following. Visit mongodb official https://docs.mongodb.com/manual/reference/operator/query/in/.
db.getCollection('adunits').find(
{ "_id":
{ $in:
[ "5bf510156c154934150ef006",
"5bf5309e6c154934150f00a6",
"5bd9b874a4efae39d0b5a58d",
"5bf52a876c154934150efe4a"
]
}
});
I am attempting a CRUD app with MEAN stack. I am using mongoose in Express to call to the MongoDB. I am using the FindOne function with a specified parameter, and it's always returning the same (incorrect) document.
I know I am connected to the correct database, since I get a document back from that collection, but it's always the same document, no matter what I pass as the parameter.
module.exports = mongoose.model('Player', playersSchema, 'players'); //in player.js
const Player = require('./model/players');
app.get('/api/player/:id', (req, res) =>{
Player.findOne({id: req.params.playerId},
function(err, player) {
if(err) {
res.json(err);
}
else {
res.json(player);
}
});
});
I have 3 separate "players", with three distinct "playerID" fields (38187361, 35167321, 95821442). I can use Postman to GET the following URL, for example:
http://localhost:3000/api/player/anythingyouWantInHere
and it will return 38187361, the first document. I've been over this website, many tutorials, and the Mongoose documentation and I can't see what I'm doing wrong..
I'd like to eventually find by playerId OR username OR email, but one hurdle at a time...
From the mongoose documentation of findOne, if you pass Id a null or an empty value, it will query db.players.findOne({}) internally which will return first document of the collection everytime you fetch. So make sure you are passing non-empty id here.
Note: conditions is optional, and if conditions is null or undefined,
mongoose will send an empty findOne command to MongoDB, which will
return an arbitrary document. If you're querying by _id, use
findById() instead.
Your route is '/api/player/:id', so the key on the req.params object will be 'id' not 'playerId'.
I don't know what/where/if you're populating the playerId param, but if you update your query to call req.params.id it should actually change the document based on the path as you seem to be wanting to do.
I had the same problem, and it was that the name of column's table was different from the model I had created.
In my model the name of the wrong column was "role" and in my table it was "rol".
I am attempting to perform a relatively simple update using Mongoose:
var location = locationService.getLocation(typedLat, typedLong, travelRadius);
DocumentModel.update({_id : passedInId }, { location : location }, function(err, resp){
next(err, resp);
});
In this case passedInId is the string:
"561ee6bbe4b0f25b4aead5c8"
And in the object (test data I created) the id is:
"_id": ObjectId("561ee6bbe4b0f25b4aead5c8")
When I run the above however, matched documents is 0. I assume this is because passedInId is being treated like a string, however when I type it to an ObjectId:
var queryId = ObjectId(passedInId)
The result is the same, the document doesn't match. What am I missing? This seems like it should be obvious....
Mongoose will correctly interpret a string as an ObjectId. One of the following must be the case:
That record is not in the collection. Run a query in the mongo shell to check.
Mongoose I'd looking in collection other than the one containing your test data. Remember, by default, mongo will lowercase the name under which you register your model and will add an a "s" to it.
Lastly, and your answer speaks to this, maybe your model it's just not being updated with any new information.
This behavior was because I had not yet updated the model in mongoose to include the location element. There is no error, it just doesn't match or do anything.