Add section for exception handling

[chiraggshah]

@rosa : I have added the documentation as discussed in #120. Let me know your feedback.

[brunoprietog]

Why not use rescue_from instead? As stated in the Active Job guide

[chiraggshah]

@brunoprietog : Thanks for the input. I have updated the PR.

[brunoprietog]

Nice! Now it looks much cleaner

[rosa]

With this suggestion and the above, the job will succeed because the exception will be rescued. I think you don't want this in the majority of cases, you want your job to fail so you can inspect it and retry it.

[chiraggshah]

I have added the line to raise the exception.

[rosa]

This looks good but I think we should re-raise the exception in both examples or people will have failing jobs succeed without an opportunity to examine or retry them.

[rosa]

Also... I need to look a bit deeper into this, but I'm not sure using around_perform as it was used before, and rescue_from is fully equivalent. In the first case, we're scoping the block where an exception is captured to the perform method, and in the second case, we can rescue any exception even if it happens outside perform 🤔 I'm not sure if this makes a difference, I'd need to dig deeper into it, it's just that it's not completely obvious to me that these are equivalent.

[chiraggshah]

@rosa : Good point. I too will have a look.