Problem with condition on a grid field

[jensolafkoch]

I have a collection with lawyers and another one with seminars. Seminars used to have a field lawyer with the lawyer id:

lawyer: id

Until now I looped through the seminars and then checked for the slug of a lawyer (passed in the the url) in to show them:

{{ collection:seminars }}
{{ if lawyer:slug == slug_lawyer_passed_as_url_segment }}
...
{{ /if }}
{{ /collection}}

Now I have to change the lawyer field in seminars into an array of lawyers (-> seminars can be held by more than one person):

lawyer
  - id1
  - id2

I didn't find any solution to write the same if condition because I cannot access the lawyer values like slug via the id.

I guess I miss something trivial here???

Many thanks for any help!!

UPDATE:

A colleague of mine also looked into it, we also tried to use the new parser and runtime variables, all to no avail.

Question still is: How to write a condition for a collection tag which compares with data in an array field like:

Is this possible at all? Or should we maybe settle for a custom scope?