I am working on mongoldb database, I am actually quite new to this database, I have a collection of contacts and I want to get individual data through mongo query.
Contacts Collection
[{
"_id": "57cd2f6c3966037787ce9550",
"contact": [{
"id": "457899979",
"fullname": "Abcd Hello",
"phonenumber": "123575784565",
"currentUserid": "123456789"
}, {
"id": "7994949849",
"fullname": "Keyboard Mouse",
"phonenumber": "23658974262",
"currentUserid": "123456789"
}, {
"id": "7848848885",
"fullname": "Test Xyz",
"phonenumber": "87556699632",
"currentUserid": "123456789"
}]
}, {
"_id": "57cd2fe02c40b97791b39fe3",
"contact": [{
"id": "457899979",
"fullname": "iPad",
"phonenumber": "85632889714",
"currentUserid": "789456123"
}, {
"id": "7994949849",
"fullname": "Cool",
"phonenumber": "33698777523",
"currentUserid": "789456123"
}]
}]
Mongo Query
db.friendslist.find({"currentUserid" : "789456123"})
But this query fetching empty results,
I want to fetch the list of contacts of currentUserid : 789456123.
Please kindly go through my post and suggest me some solution.
Found Solution
db.friendslist.find({ "contact": { "$elemMatch": { "currentUserid" : "789456123" } } }).pretty()
#Deeptiman, you mentioned your answer, but question id and answer id are not same.
this may help you to find "currentUserid": "789456123".in below query
$elemMatch operator matches documents that contain an array field with at least one element that matches all the specified query criteria.
and .pretty() used to format your code.
db.friendslist.find({
"contact": {
"$elemMatch": {
"currentUserid" : "789456123"
}
}
}).pretty()
Related
[
{
"key": "test1",
"category": "test",
"name": "test1",
"translations":
{
"english": "eng"
}
},
{
"key": "test2",
"category": "test",
"name": "test1",
"translations":
{
"english": "eng2",
"german": "German"
}
},
{
"key": "test3",
"category": "power",
"name": "test1",
"translations":
{
"EN_lang": "jik"
}
}
]
Here, we have multiple field's are with different values and we have to match value in translations (field position will change on every call)
You have to be clear about what you want to assert. Hint, the new contains deep (available in 0.9.6.RC4) can help:
* match response contains deep { key: 'test2', translations: { english: 'eng2' } }
Else you should look at transforming the JSON into a shape where it is easier to do the assertions you want: https://github.com/intuit/karate#json-transforms
I have Cosmos DB collection (called sample) containing the following documents:
[
{
"id": "id1",
"messages": [
{
"messageId": "message1",
"Text": "Value1"
},
{
"messageId": "message2",
"Text": "Value2"
}
]
},
{
"id": "id2",
"messages": [
{
"messageId": "message3",
"Text": "Value3"
},
{
"messageId": "message4",
"Text": "Value1"
}
]
},
{
"id": "id3",
"messages": [
{
"messageId": "message5",
"Text": "Value1"
},
{
"messageId": "message6",
"Text": "Value2"
}
]
},
{
"id": "id4",
"messages": [
{
"messageId": "message7",
"Text": "Value5"
},
{
"messageId": "message8",
"Text": "Value2"
}
]
},
]
I am trying to retrieve all the Documents, having messages and the first message has the field "Text"= 'Value1'.
In this sample the documents with the ids '1' and '3' would be retrieved. Please notice that the document with id='id2' wouldn't be retrieved,
since the value of the text of the first message is 'Value3'.
The collection as mentioned is called sample and I am running the following Query:
"select sample.id, sample.messages, ARRAY_SLICE(sample.messages, 0, 1)[0].Text as valueOfText from sample"
As you can see in the first two images, I retrieve all Documents and every one of them have the field "valueOfText" set to value of the first message, as expected.
Now when I filter the collection (the third image), I retrieve no results at all.
Is this an expected behavior?
Following your sql, got same results:
But why you have to use ARRAY_SLICE,it is used to return truncated array.Since your requirement is specific:
trying to retrieve all the Documents, having messages and the first
message has the field "Text"= 'Value1'
Just use sql:
SELECT c.id,c.messages,c.messages[0].Text as valueOfText FROM c
where c.messages[0].Text = 'Value1'
Output:
I'm trying to use UpdateRecord 1.9.0 processor to modify a JSON but it does not replace the values as I want.
this is the source message
{
"type": "A",
"ids": [{
"id": "1",
"value": "abc"
}, {
"id": "2",
"value": "def"
}, {
"id": "3",
"value": "ghi"
}
]
}
and the wanted output
{
"ids": [{
"userId": "1",
}, {
"userId": "2",
}, {
"userId": "3",
}
]
}
I have configured the processor as follows
processor config
Reader:
reader
Schema registry:
schema
writer:
writer
And it works, the output is a JSON without the field 'type' and the ids have the field 'userId' instead 'id' and 'value'.
To fill the value of userId, I defined the replace strategy and the property to replace:
strategy
But the output is wrong. The userId is always filled with the id of the last element in the array:
{
"ids": [{
"userId": "3"
}, {
"userId": "3"
}, {
"userId": "3"
}
]
}
I think the value of the expression is ok because if I try to replace only one record it works fine (/ids[0]/userId, ..id)
Nifi docs has a really similar example (example 3):
https://nifi.apache.org/docs/nifi-docs/components/org.apache.nifi/nifi-standard-nar/1.7.1/org.apache.nifi.processors.standard.UpdateRecord/additionalDetails.html
But it does not work for me.
What am I doing wrong?
thanks
Finally I have used JoltJSONTransform processor instead UpdateRecord
JoltJSONTransform
template:
[
{
"operation": "shift",
"spec": {
"ids":{
"*":{
"id": "ids[&1].userId"
}
}
}
}
]
Easier than UpdateRecord
I am working on mongodb database, but i am little stuck in one logic, how do i find match elements in between two collections in mongodb.
Users Collection
[{
"_id": "57cd539d168df87ae2695543",
"userid": "3658975589",
"name": "John Doe",
"email": "johndoe#gmail.com",
"number": "123654789"
}, {
"_id": "57cd53e6168df87ae2695544",
"userid": "789456123",
"name": "William Rust",
"email": "williamrust#gmail.com",
"number": "963258741"
}]
Contacts Collection
[{
"_id": "57cd2f6c3966037787ce9550",
"contact": [{
"id": "457899979",
"fullname": "Abcd Hello",
"phonenumber": "123575784565",
"currentUserid": "123456789"
}, {
"id": "7994949849",
"fullname": "Keyboard Mouse",
"phonenumber": "23658974262",
"currentUserid": "123456789"
}, {
"id": "7848848885",
"fullname": "John Doe",
"phonenumber": "852147852",
"currentUserid": "123456789"
}]
}]
So i want to find (phone number) matched elements from these two collections and list out those elements with their name and email.
Please kindly go through my post and suggest me some solution.
I'm guessing that you want to do is "aggregate + lookup". Something like this:
db.users.aggregate([{$lookup:
{
from: "contacts",
localField: "number",
foreignField: "phonenumber",
as: "same"
}
},
{
$match: { "same": { $ne: [] } }
}
])
As a result you get:
{
"_id" : "57cd539d168df87ae2695543",
"userid" : "3658975589",
"name" : "Anshuman Pattnaik",
"email" : "anshuman#gmail.com",
"number" : "7022650603",
"same" : [
{
"_id" : ObjectId("5b361b864aa5144b974c9733"),
"id" : "7848848885",
"fullname" : "Anshuman Pattnaik",
"phonenumber" : "7022650603",
"currentUserid" : "123456789"
}
]
}
If you want show only the name and the email, you have to add { $project: { name: 1, email:1, _id:0 }
db.users.aggregate([{$lookup:
{
from: "contacts",
localField: "number",
foreignField: "phonenumber",
as: "same"
}
},
{
$match: { "same": { $ne: [] } }
},
{ $project: { name: 1, email:1, _id:0 }
])
Then you'll get:
{ "name" : "Anshuman Pattnaik", "email" : "anshuman#gmail.com" }
For this to work you have to correct the insert of your contacts like this:
db.contacts.insert(
[{
"id": "457899979",
"fullname": "Abcd Hello",
"phonenumber": "123575784565",
"currentUserid": "123456789"
}, {
"id": "7994949849",
"fullname": "Keyboard Mouse",
"phonenumber": "23658974262",
"currentUserid": "123456789"
}, {
"id": "7848848885",
"fullname": "Anshuman Pattnaik",
"phonenumber": "7022650603",
"currentUserid": "123456789"
}]
)
Hope it works!
For more information https://docs.mongodb.com/manual/reference/operator/aggregation/lookup/
it's not your complete answer, but it may help you to solve your problem.
you can compare two documents using below function. for more details see this answer
var compareCollections = function(){
db.users collection.find().forEach(function(obj1){
db.contacts collection.find({/*if you know some properties, you can put them here...if don't, leave this empty*/}).forEach(function(obj2){
var equals = function(o1, o2){
// some code.
};
if(equals(ob1, obj2)){
// Do what you want to do
}
});
});
};
db.eval(compareCollections);
I am trying to list all the types for a particular id:
{
"id": "/en/sony",
"type": [{
"name": "Topic",
"id": null
}]
}
This query giving me the following result:
http://tinyurl.com/lubavey
{
"result": {
"type": [
{
"id": "/common/topic",
"name": "Topic"
},
{
"id": "/base/audiobase/topic",
"name": "Topic"
},
{
"id": "/base/fblinux/topic",
"name": "Topic"
},
{
"id": "/base/digitalcameras/topic",
"name": "Topic"
},
{
"id": "/base/popstra/topic",
"name": "Topic"
},
{
"id": "/base/televisions/topic",
"name": "Topic"
},
{
"id": "/base/ps3games/topic",
"name": "Topic"
},
{
"id": "/base/filmcameras/topic",
"name": "Topic"
},
{
"id": "/m/04mny2g",
"name": "Topic"
}
],
"id": "/en/sony"
}
}
I want exactly the opposite result. I want all the types which do not have name as "Topic" with them.
How can I achieve this? I tried to use ! operator with property name which is suggested in reference guide of MQL, but it's giving me error:
"Can't use unqualified property names with ! reversing".
What should I do to remove this error with ! and to obtain opposite result of the query?
Try with !=:
{
"id": "/en/sony",
"type": [{
"name!=": "Topic",
"id": null
}]
}
The != operator says that the constrained property can be anything but
the specified value. (It does require that the property be something,
however: it does not match object for which the property is null.)
Read more about != operator here: http://wiki.freebase.com/wiki/MQL_operators#The_.22but_not.22_Operator_.21.3D