Find when the keys are unkown in mongodb - node.js

Question

How can I getthe data that has email as abc#gmail.com in mongoDB?I don't know the Key Name and I want to iterate through all the data.
I have data like this:
{
"_id":"5c0a1589a5a41b2ae707317b",
"test1":{
"email":"abc#gmail.com",
"phoneNo":"123456897",
"endpointId":"test1"
}
}
{
"_id":"5c0a1989a5a41b2ae807317b",
"test2":{
"email":"abc#gmail.com",
"phoneNo":"123456897",
"endpointId":"test2"
}
}
{
"_id":"5c0a1989a5a41b2ae807317b",
"test2":{
"email":"pqr#gmail.com",
"phoneNo":"123456897",
"endpointId":"test3"
}
}
But the object key is not known at the time of searching. I want to iterate through all the data and get matched data that has specific email.
If I know the key name like test1,test2 etc then I can use find({test1:{...}}) but Here I don't know the key value.
So, how can I do that?

Answer 1

You can use below aggregation using $objectToArray in mongodb 3.4 and above
db.collection.aggregate([
{ "$addFields": {
"field": { "$objectToArray": "$$ROOT" }
}},
{ "$match": { "field.v.email": "abc#gmail.com" }},
{ "$project": { "field": 0 }}
])

Answer 2

I am assuming you get the objects in array type.
I made a method named findObject. This method will take the object array and the desired email.
Finally, return the first object, that matched with the email.
const data = [{
"_id":"5c0a1589a5a41b2ae707317b",
"test1":{
"email": "abc#gmail.com",
"phoneNo": "123456897",
"endpointId":"test1"
}
},
{
"_id":"5c0a1989a5a41b2ae807317b",
"test2":{
"email": "abc#gmail.com",
"phoneNo": "123456897",
"endpointId":"test2"
}
},
{
"_id":"5c0a1989a5a41b2ae807317b",
"test2":{
"email": "pqr#gmail.com",
"phoneNo": "123456897",
"endpointId": "test3"
}
}];
const findObject = (data, email) => {
for (let index=0; index<data.length; index++) {
const currentData = data[index];
for (let property in currentData) {
if (property != '_id' && currentData[property].email == email) {
return currentData;
}
}
}
return null;
}
let desiredObject;
const desiredEmail = 'abc#gmail.com';
desiredObject = findObject(data, desiredEmail);
console.log(desiredObject);
And the output will be
{ _id: '5c0a1589a5a41b2ae707317b',
test1:
{ email: 'abc#gmail.com',
phoneNo: '123456897',
endpointId: 'test1' } }

Answer 3

I think you can't do query on totally unknown field! if you could change your schema see here for more info, also you could write script to migrate to a new DB with new schema:
// new doc instance
{
"_id":"5c0a1589a5a41b2ae707317b",
"obj": {
"name": "test1"
"email":"abc#gmail.com"
"phoneNo":"123456897",
"endpointId":"test1"
}
},
{
"_id":"5c0a1989a5a41b2ae807317b",
"obj": {
"name": "test2"
"email":"abc#gmail.com"
"phoneNo":"123456897",
"endpointId":"test2"
}
},
{
"_id":"5c0a1989a5a41b2ae807317b",
"obj": {
"name": "test3"
"email":"pqr#gmail.com"
"phoneNo":"123456897",
"endpointId":"test3"
}
}
otherwise, check this may works correctly. if all of them is not effective so make a query to get all of your data as an Array and use filter method on it:
Model.find({}, (err, docs) => {
const result = docs.filter((doc) => {
for (key in doc) {
if (doc[key].email === 'abc#gmail.com')
return doc;
}
});
console.log(result);
});