I am using SQLFORM.GRID to display the database records. In my application, 
certain records may contain the reference to id of other records. 
Currently, I have to use "search" option to find the record matching 
reference id.

What I want to do is :- Have a hyperlink in the reference field and then 
open the details (View button equivalent) for the other record.Problem is 
View button for each row in GRID has a unique _signature . In the absence 
of this value, I can't form the hyperlink (view option) for other record. 

How can I get the _signature value associated with GRID records?

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