I have a model, which contains a sub-model (see attached attached). The main model iterates through feature classes in a gdb and operates on them by passing them to sub-models. One of these sub-models takes the FC, uses its name to find a corresponding raster, then uses zonal statistics as table to calculate some summary data, join it to the FC and finally delete the join. At least, that's what I want it to do. If I use this sub-model on its own and provide the fc and zonal field manually, it works fine. The problem is I can't figure out how to use the model to provide the field name.
I went to the trouble of ensuring that every FC the main model will encounter has a field simply called 'name', which is a unique field I want to use as the zone field. I tried to just put 'name' as the zone field in the sub-model's Zonal Stats process, but it gets deleted once I click away from that field. I tried using a variable, but that didn't seem to work either. Surely there is a way to do this, but I don't see anything about this in the documentation.