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Editorial Team
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Asked: 2026-06-17T14:05:09+00:00

I have the following code which is supposed to get me only the new

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I have the following code which is supposed to get me only the new events added to the table from the last time i checked the table. 

events=@browser.table( :id =>'table_events').tbody.rows
....
some code
....
events_new=@browser.table( :id =>'table_events').tbody.rows
events=events_new - events # not working !!

Im getting the fallowing error : 

undefined method `-' for #<Watir::TableRowCollection:0x007fccb9ba2358> (NoMethodError)

I understand that the “-” predicate is wrong of course, but is there a method that does what i need or do i need to go over all the TableRowCollection and find the new rows manually?

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1 Answer

  1. Editorial Team

    You could try converting the TableRowCollection to an array, which does support subtraction:

    events = events_new.to_a - events.to_a

    That will work provided the elements have a useful == method defined – and it looks like they do.

    Correction: actually, because array subtraction is implemented using a hash table for efficiency (view source here if you’re curious), it is not the TableRow#== method that is important but the TableRow#hash method. Fortunately, it looks like Watir implements that as well.

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