I proposed PRrubocop/rubocop#13352 to add a newLint/NoRescueErrorMessageChecking cop that discourages rescue error matching. We built a custom cop at my company and thought it might be useful to roll it out as built in cop.

I was suggested by@dvandersluis to reach out to the community for feedback whether its a useful cop or not.

# badbegin  somethingrescue => e  if e.message.match?(/Duplicate entry/)    handle_error  endend# badbegin  somethingrescue => e  unless e.message.match?(/Duplicate entry/)    handle_error  endend# goodbegin  somethingrescue ActiveRecord::RecordNotUnique => e  handle_errorend