Menu
What is a best practice? To use try or use rescue?
user.try(:email) VS
user.email rescue nil post.try(:comments).try(:first).try(:author) VS
post.comments.first.author rescue nil Is there any difference in using any of these?
851
The method definition itself does the work of begin , so you can omit it. You can also do this with blocks. Now, there is one more way to use the rescue keyword without begin .
The code between “begin” and “rescue” is where a probable exception might occur. If an exception occurs, the rescue block will execute. You should try to be specific about what exception you're rescuing because it's considered a bad practice to capture all exceptions.
Exception handling in Ruby on Rails is similar to exception handling in Ruby. Which means, we enclose the code that could raise an exception in a begin/end block and use rescue clauses to tell Ruby the types of exceptions we want to handle.
In Ruby we have a way to deal with these cases, we have begin, end(default try catch) and we can use try and catch, both try catch and raise rescue used for the same purpose, one will throw exception(throw or raise) with any specific name inside another(catch or rescue).
Try and rescue serve different purposes. The purpose of try is to save you from having to do:
if user && user.email Or any situation where the parent object can possibly be nil, which would cause a NoMethodError on NilClass. The purpose of rescue is to handle exceptions that get thrown by your method invocation. If you expect an exception from calling user.email, then you can rescue nil it to prevent the exception from bubbling up.
In general, I'd say avoid using rescue nil unless you know explicitly what exceptions you are rescuing because you could be rescuing a different exception, and you would never know it because rescue nil would prevent you from seeing it. At the very least maybe you could log it:
begin ...some code... rescue => ex logger.error ex.message end If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
