Butler automation to use a Label to create a dual Trello link to and from another card

Question

I"m new to Trello, but I was wondering if there is a way to use Butler automation to automatically link two Trello cards together (bidirectional link) using Labels.

We want to be able to add a Label to a card in a Task list, and then have Butler automatically find the Project where the label was defined and attached so that both the Project card ad the Task card have bi-directional links in them.

Or, is there a better way to bidirectionally link two cards in a hierarchy?

Iain Dooley · Answer

@Kevin Crocker okay it doesn't look like "find the first card in list blah with label x" is possible in the powerup anyway. This Trellinator function would do it retroactively, and something similar would work for triggering when a label is added:

https://gist.github.com/iaindooley/7ce6368af358207d488d2a48211fea12

You can read more about Trellinator here:

https://community.atlassian.com/t5/Marketplace-Apps-Integrations/Introducing-Trellinator-Automate-Trello-with-Google-Apps-Script/ba-p/925271

Kevin Crocker · Answer

something like that - except I want to be able to do this automatically for all the cards in the Tasks list

Because we've already created lots of tasks (actually, several lists that have different task titles) and we need to link them bi-directionally with the projects.

Does that make sense?

Iain Dooley · Answer

@Kevin Crocker okay so if I'm understanding correctly, the functionality would be something like:

When I add a label to a card in the "Tasks" list, find the first card in the "Projects" list with the same label and link the 2 cards together

Is that correct?