How can I incorporate a custom function in Robo3T?

Question

How can I incorporate a custom function in Robo3T?

After installing Robo3T (previously known as robomongo), a GUI for mongo db, I wanted to add a custom function to retrieve the last N documents in normal order. The query statement I used was:

db.getCollection('i1801').find().skip(db.getCollection('i1801').count() - 1200)

I came across a solution on stackoverflow (mongodb: how to get the last N records?) where it was suggested to create a function like this:

function last(N) {
    return db.collection.find().skip(db.collection.count() - N);
}

When I tried to add this custom function last() in Robo3T, it didn't work as expected. Nothing appeared under the function tab.

I have included some screenshots to show the issue:

https://i.sstatic.net/yoGUl.png

https://i.sstatic.net/CtM1l.png

https://i.sstatic.net/FD6jc.png

Even after clicking the save button, nothing changed. There were still no functions displayed under the function tab. The log indicated that the function last was created, and the function tab was refreshed. https://i.sstatic.net/fdxcQ.png

So, I'm wondering how I can successfully add the last function here?

javascript mongodb robo3t

Answer 1

Answer №1

Following the steps you provided, I was able to successfully execute simple find statements. However, I encountered a problem when I tried to add the 'skip' parameter, resulting in the save operation failing. Even updating an existing function did not yield the desired outcome. Could this be an issue with Robo? I'm uncertain.

For those looking to add a function in Robo3t, here's how:

Right-click on the collection
Select 'Open Shell'
In the shell, enter the following:

db.system.js.save(
   {
     _id: "last",
     value : function last(x) { return db.test.find().skip(db.test.count() - x); }
   }
)

Finally, run the script and refresh the Function folder.

Answer 2

Following the steps you provided, I was able to successfully execute simple find statements. However, I encountered a problem when I tried to add the 'skip' parameter, resulting in the save operation failing. Even updating an existing function did not yield the desired outcome. Could this be an issue with Robo? I'm uncertain.

For those looking to add a function in Robo3t, here's how:

Right-click on the collection
Select 'Open Shell'
In the shell, enter the following:

db.system.js.save(
   {
     _id: "last",
     value : function last(x) { return db.test.find().skip(db.test.count() - x); }
   }
)

Finally, run the script and refresh the Function folder.

Answer 3

Answer №2

To execute the function:

db.loadServerScripts();
callyourfunction();

Start by right clicking on the collection
Then, click on open shell
https://i.sstatic.net/YTiGc.jpg
In the shell, enter the command db.loadServerScripts();
https://i.sstatic.net/BDTBT.jpg
Now you can call the user function like this: addTwo(2,5);
https://i.sstatic.net/EujGo.jpg

NOTE :: To see the output, ensure that your function has a return value

Answer 4

To execute the function:

db.loadServerScripts();
callyourfunction();

Start by right clicking on the collection
Then, click on open shell
https://i.sstatic.net/YTiGc.jpg
In the shell, enter the command db.loadServerScripts();
https://i.sstatic.net/BDTBT.jpg
Now you can call the user function like this: addTwo(2,5);
https://i.sstatic.net/EujGo.jpg

NOTE :: To see the output, ensure that your function has a return value

How can I incorporate a custom function in Robo3T?

Answer №1

Answer №2

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