TRELLO H2 get a list summary with card count and custom field summing-up
Asked by Louis-Thibaud Haller:

Hello all,

I'm trying to setup an automatic summary for lists with card count and few custom field summing-up without success yet ;-)

Attached is my optimal result with of course automatic update of the top summary cards when project cards are moved out/in of lists or if custom fields values are changed. Another key thing for me is to get summary and project info in the same screen.![capture 000125.jpg](/t5/image/serverpage/image-id/56755i5B3C77213983EBFA/image-size/large?v=v2&px=999 "capture 000125.jpg")

I've tested some Chrome extensions but couldn't have more than a card count or a bunch of unlabelled figures. I also went through dashcards with Butlerbot which could have done the job but seems to be discontinued since Butler integration within Trello. Butler power-up can also count cards with increase/decrease action in rules but it can't sum-up custom fields. I have also tried a workaround with Zapier and Google sheet but it burns lots of tasks from my Zapier plan ;-(

Has anyone an idea or a workaround to suggest ?

Many thanks in advance

Regards

Louis-Thibaud


Answers:
author: Sami Linnanvuo _Screenful_
body: I suggest you take a look at our free Card Size Power-Up. It allows you to enter two numbers for each card and see the summaries per list, assignee, or label:   

<https://screenful.com/card-size-for-trello>

comments: author: Louis-Thibaud Haller
body: Thanks Sami,

I checked Card Size PU, it's great and might be useful but doesn't really fit my needs as I need counting and summing up on specific custom fields filled up by other automatic processes.

Thanks anyway

Cheers


author: Katrin Anger
body: [@Louis-Thibaud Haller](/t5/user/viewprofilepage/user-id/2575682)

As long as you have numeric custom fields, you should be able to sum them up with the Butler Power-Up. I think I have seen this before. - May I ask what makes you come to the conclusion that this isn't possible with Butler?

comments: author: Louis-Thibaud Haller
body: Hi Katrin, thanks for you answer.

I may have missed something but for my use case, Butler can trigger a rule on moving a card to a list, then search for a summary card and set custom fields of this card but with limited action, such as set value to x or increase/decrease by 1 or x with no ability to use variable as x. So to me summing-up is not possible.

I would be glad to be wrong ;-)

Thanks for your help


author: Katrin Anger
body: [@Louis-Thibaud Haller](/t5/user/viewprofilepage/user-id/2575682)

Hi Louis-Thibaud,

as long as I don't see your use case, I cannot say it's not possible. But doing arithmetic with custom field variables has been a possibility in Butler for a long time.

Below is a simple example that illustrates how it works:

![Bildschirmfoto 2019-06-14 um 11.07.09.png](https://community.atlassian.com/t5/image/serverpage/image-id/57629iA4DC90B8BB89322A/image-dimensions/581x341?v=v2 "Bildschirmfoto 2019-06-14 um 11.07.09.png")

Here is the [support documentation](https://help.butlerfortrello.com/article/36-custom-field-arithmetic) (not very much, but better than nothing) that explains the concept.

Does that help?


author: Louis-Thibaud Haller
body: Hi Katrin,

My use case is as described in my first post ;-)

I need to do arithmetic like : when a card A is moved to list step 1, then search for a card named summary in list step 1, and set custom field of card summary to {Budget of summary card} + {Budget of card A} OR increase custom field of card summary by {Budget of card A}

I hope I'm clear

Thanks again for your help


author: Katrin Anger
body: [@Louis-Thibaud Haller](/t5/user/viewprofilepage/user-id/2575682)

Hi Louis-Thibaud,

ok, I now see the challenge.

I cannot think of a way either to sum up only a selection of custom field values. Sorry!


Tags: custom-field