Can't find does not contain element in array in mongodb?
I am a beginner in mongodb. I want to check if a particular element is present in array. If the given element is already present in the array it should show already exists. If the given element is not present in array it should show this array doesn't contain this element. But my program it shows already exist for all input. What is the problem in my code?
var mongodb=require("mongodb");
var mongoclient=mongodb.MongoClient;
var url="mongodb://localhost:27017/hello";
mongoclient.connect(url,function(err,db)
if(err)
console.log(err);
else
console.log("connect the details database successfully");
var collection=db.collection("users");
collection.find("email":$contains:"sample@gmail.com",function(error,ok)
if(error)
console.log(error);
else if(ok)
console.log("already exist");
// print something if element is not present in array how can i check?
);
db.close();
);arrays mongodb
edited Nov 13 '18 at 14:42
guaka
10.3k74481
asked Oct 25 '17 at 17:53
sampleprogrammerssampleprogrammers
2718
add a comment |
I am a beginner in mongodb. I want to check if a particular element is present in array. If the given element is already present in the array it should show already exists. If the given element is not present in array it should show this array doesn't contain this element. But my program it shows already exist for all input. What is the problem in my code?
var mongodb=require("mongodb");
var mongoclient=mongodb.MongoClient;
var url="mongodb://localhost:27017/hello";
mongoclient.connect(url,function(err,db)
if(err)
console.log(err);
else
console.log("connect the details database successfully");
var collection=db.collection("users");
collection.find("email":$contains:"sample@gmail.com",function(error,ok)
if(error)
console.log(error);
else if(ok)
console.log("already exist");
// print something if element is not present in array how can i check?
);
db.close();
);arrays mongodb
edited Nov 13 '18 at 14:42
guaka
10.3k74481
asked Oct 25 '17 at 17:53
sampleprogrammerssampleprogrammers
2718
add a comment |
I am a beginner in mongodb. I want to check if a particular element is present in array. If the given element is already present in the array it should show already exists. If the given element is not present in array it should show this array doesn't contain this element. But my program it shows already exist for all input. What is the problem in my code?
var mongodb=require("mongodb");
var mongoclient=mongodb.MongoClient;
var url="mongodb://localhost:27017/hello";
mongoclient.connect(url,function(err,db)
if(err)
console.log(err);
else
console.log("connect the details database successfully");
var collection=db.collection("users");
collection.find("email":$contains:"sample@gmail.com",function(error,ok)
if(error)
console.log(error);
else if(ok)
console.log("already exist");
// print something if element is not present in array how can i check?
);
db.close();
);arrays mongodb
edited Nov 13 '18 at 14:42
guaka
10.3k74481
asked Oct 25 '17 at 17:53
sampleprogrammerssampleprogrammers
2718
I am a beginner in mongodb. I want to check if a particular element is present in array. If the given element is already present in the array it should show already exists. If the given element is not present in array it should show this array doesn't contain this element. But my program it shows already exist for all input. What is the problem in my code?
var mongodb=require("mongodb");
var mongoclient=mongodb.MongoClient;
var url="mongodb://localhost:27017/hello";
mongoclient.connect(url,function(err,db)
if(err)
console.log(err);
else
console.log("connect the details database successfully");
var collection=db.collection("users");
collection.find("email":$contains:"sample@gmail.com",function(error,ok)
if(error)
console.log(error);
else if(ok)
console.log("already exist");
// print something if element is not present in array how can i check?
);
db.close();
);var mongodb=require("mongodb");
var mongoclient=mongodb.MongoClient;
var url="mongodb://localhost:27017/hello";
mongoclient.connect(url,function(err,db)
if(err)
console.log(err);
else
console.log("connect the details database successfully");
var collection=db.collection("users");
collection.find("email":$contains:"sample@gmail.com",function(error,ok)
if(error)
console.log(error);
else if(ok)
console.log("already exist");
// print something if element is not present in array how can i check?
);
db.close();
);var mongodb=require("mongodb");
var mongoclient=mongodb.MongoClient;
var url="mongodb://localhost:27017/hello";
mongoclient.connect(url,function(err,db)
if(err)
console.log(err);
else
console.log("connect the details database successfully");
var collection=db.collection("users");
collection.find("email":$contains:"sample@gmail.com",function(error,ok)
if(error)
console.log(error);
else if(ok)
console.log("already exist");
// print something if element is not present in array how can i check?
);
db.close();
);arrays mongodb
arrays mongodb
edited Nov 13 '18 at 14:42
guaka
10.3k74481
asked Oct 25 '17 at 17:53
sampleprogrammerssampleprogrammers
2718
edited Nov 13 '18 at 14:42
guaka
10.3k74481
asked Oct 25 '17 at 17:53
sampleprogrammerssampleprogrammers
2718
edited Nov 13 '18 at 14:42
guaka
10.3k74481
edited Nov 13 '18 at 14:42
guaka
10.3k74481
edited Nov 13 '18 at 14:42
guaka
10.3k74481
10.3k74481
asked Oct 25 '17 at 17:53
sampleprogrammerssampleprogrammers
2718
asked Oct 25 '17 at 17:53
sampleprogrammerssampleprogrammers
2718
asked Oct 25 '17 at 17:53
sampleprogrammerssampleprogrammers
2718
2718
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
Check the documentation:
Anywhere a callback is passed to a query in Mongoose, the callback
follows the pattern callback(error, results). What results is depends
on the operation: For findOne() it is a potentially-null single
document, find() a list of documents, count() the number of documents,
update() the number of documents affected, etc. The API docs for
Models provide more detail on what is passed to the callbacks.
So, you will always get a list of documents which, however, can be empty.
answered Oct 25 '17 at 17:57
dnicklessdnickless
6,6451320
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Check the documentation:
Anywhere a callback is passed to a query in Mongoose, the callback
follows the pattern callback(error, results). What results is depends
on the operation: For findOne() it is a potentially-null single
document, find() a list of documents, count() the number of documents,
update() the number of documents affected, etc. The API docs for
Models provide more detail on what is passed to the callbacks.
So, you will always get a list of documents which, however, can be empty.
answered Oct 25 '17 at 17:57
dnicklessdnickless
6,6451320
add a comment |
Check the documentation:
Anywhere a callback is passed to a query in Mongoose, the callback
follows the pattern callback(error, results). What results is depends
on the operation: For findOne() it is a potentially-null single
document, find() a list of documents, count() the number of documents,
update() the number of documents affected, etc. The API docs for
Models provide more detail on what is passed to the callbacks.
So, you will always get a list of documents which, however, can be empty.
answered Oct 25 '17 at 17:57
dnicklessdnickless
6,6451320
add a comment |
Check the documentation:
Anywhere a callback is passed to a query in Mongoose, the callback
follows the pattern callback(error, results). What results is depends
on the operation: For findOne() it is a potentially-null single
document, find() a list of documents, count() the number of documents,
update() the number of documents affected, etc. The API docs for
Models provide more detail on what is passed to the callbacks.
So, you will always get a list of documents which, however, can be empty.
answered Oct 25 '17 at 17:57
dnicklessdnickless
6,6451320
Check the documentation:
Anywhere a callback is passed to a query in Mongoose, the callback
follows the pattern callback(error, results). What results is depends
on the operation: For findOne() it is a potentially-null single
document, find() a list of documents, count() the number of documents,
update() the number of documents affected, etc. The API docs for
Models provide more detail on what is passed to the callbacks.
So, you will always get a list of documents which, however, can be empty.
answered Oct 25 '17 at 17:57
dnicklessdnickless
6,6451320
answered Oct 25 '17 at 17:57
dnicklessdnickless
6,6451320
answered Oct 25 '17 at 17:57
dnicklessdnickless
6,6451320
answered Oct 25 '17 at 17:57
dnicklessdnickless
6,6451320
6,6451320
add a comment |
add a comment |
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