GridPlus - I probably need a related action to update only the edited recs

Question

I have GridPlus implemented nicely and does the basic editing and saving as it should, what a great plug in! 
 
 But... we have a requirement added to create a related record which would link the edited items to a known key value in a related table. 
 Since both the queryRule and gridsubmitchanges->editModel are kind of rigidly defined, I've been thinking of ways to accomplish adding the record to join the edited rows with the other table. 
 Can a related action apply to just the 'edits' / is there a way to pass that? 
 I explored the possibility of a 'tempKey' in the queryRule's queryRecordType, but can't really insert that known key value there. If I could just get the data into the record, then the editModel could do the additional writerecords & sync. 
 
 Is there some simple way to accomplish this without having to get heavy handed by maybe writing to another data store to be re-read in the editModel? (so it would know "any records updated from this grid with these record keys must associate the stored key that I just re-read"?

Shubham Aware · Answer

Use GridPlus's edited records payload (via editModel), pass your known key as a process parameter, and in the same process do two Write Records calls (one for grid edits, one for join rows). No temp datastore needed.

Shubham Aware · Answer

You can&rsquo;t pass custom params to &thinsp;editModel&thinsp;, so stamp the known key onto each edited row before submit. 
 Add your known key as a field on each edited row before submit. The process then reads pv!record and runs both Write Records; one for the edited rows, one for the join rows.