Forum | Appery.io

Ok guys.....

When do you think you will enable the "Limit Fields" feature of MongoDB. I am assuming you are still using MongoDB for your backend. The performance advantages are monumental in a pictures driven app.

http://docs.mongodb.org/manual/tutori...

Hello!

Thank you for your suggestion.
It will be transferred to our developer team.

Hello!

It is implemented already, please take a look here http://devcenter.appery.io/documentat...

Hi Maryna,

Thanks for the response. Projection is working as expected. Significantly improved my app's performance.

I am also successfully able to limit columns from related objects. My question is, can I further limit columns from a related object that belongs to a related related object.

proj = { "OwnerID":{"FirstName":1, "Lastname":1}} // This works

proj = { "OwnerID":{"FirstName":1, "Lastname":1, "Picture":{ "Photo1" : 1 }}} // This does not work

Why not?

Hi Bahar,

I've tested the case you've described above.

And got correct results.

Here is my fields:

pre

include: owner,owner.SuperUser

proj: {name: 1, owner: {user_name: 1, SuperUser: {username: 1} } }

/pre

May be you forget to add "OwnerID.Picture" to include field?

See details on the screen shot: http://prntscr.com/47nlb3/direct

Regards.

Thank you, that works.

However, exclude does not work in the same way. For example change all the 1s to 0s and you don't get the opposite result. Do you know why?

Hi Bahar,

I've checked it and see some errors, reported a bug to our developers.

Sorry for this inconvenience. We will update you here when it will be fixed.

Regards

Hi Maryna,

Could you provide more details regarding projection? can not find related information in the above link.

Thanks

Dongzhi

Hi Dongzhi,

Please find this information here: https://devcenter.appery.io/documenta...

Regards.

Thanks Yurii. I understood.