A better way to query branch metadata?

[alexpghayes]

When I use dynamic within static branching, I find myself rather frequently using regex on target names to recover metadata that I want to use. I use the branching to iterate over estimators/models/data sources and then I produce a bunch of diagnostics for each estimator/model/data source (static branching), and for each of these I have a bunch of hyperparameters that I iterate over with dynamic branching. It is easy to get the hyperparameter information / dynamic branch provenance, I just do something like

tar_target(
      hub_tables,
      extract_hubs(vsp_analysis, node_data, hyperparameters),
      pattern = map(vsp_analysis, hyperparameters),
      format = "file"
)

To get the static branch meta data I do something like the following within extract_hubs():

  metadata_list <- unglue(tar_name(), "{junk}_{estimator}_{data}_{hash=[a-z0-9]*}")

Is there some approach here that doesn't involve parsing target names like this?

[wlandau]

I recommend keeping track of the metadata inside the targets you map over, e.g. vsp_analysis or hyperparameters, so you do not need to interpret target names.