Hi Sorin,

This situation could be resolved by using your action to apply a filter to 
the list in order to get a subset of results, no need to have an action 
within action. Rather conveniently, filtering is handled in the URI so:

   - Build a Datagrid filter that will perform your 
   findSimilarFingerprintAction
   - With the filter in place, look at how it changes the URI when used
   - In your list action, redirect the user to the URI for above
   
If this isn't enough, the next step would be to have a second admin which 
extends your current admin which implements the equivalent of 
findSimilarFingerprintAction 
in the createQuery function.

I believe you would be able to do the whole thing with first approach 
mentioned though.

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