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This blog is part of our Ruby 2.5 series. Stack trace or backtrace is a sequential representation of the stack of method calls in a program which gets printed when an exception is raised. It is often used to find out the exact location in a program from where the exception was raised.
Yes. If you create a new Exception() and don't throw it, every property except Data and Message will be null.
Therefore, you should log a stacktrace if, and only if, and always if, the exception indicates a bug in the program. However, that does not always indicate that a method you write should catch and log the exception.
You can use Kernel#caller:
# /tmp/caller.rb
def foo
puts caller # Kernel#caller returns an array of strings
end
def bar
foo
end
def baz
bar
end
baz
Output:
caller.rb:8:in `bar'
caller.rb:12:in `baz'
caller.rb:15:in `<main>'
Try using
Thread.current.backtrace
I use this to show a custom error page when exception are raised.
rescue_from Exception do |exception|
logger.error exception.class
logger.error exception.message
logger.error exception.backtrace.join "\n"
@exception = exception
# ExceptionNotifier::Notifier.exception_notification env, @exception
respond_to do |format|
if [AbstractController::ActionNotFound, ActiveRecord::RecordNotFound, ActionController::RoutingError, ActionController::UnknownAction].include?(exception.class)
format.html { render :template => "errors/404", :status => 404 }
format.js { render :nothing => true, :status => 404 }
format.xml { render :nothing => true, :status => 404 }
elsif exception.class == CanCan::AccessDenied
format.html {
render :template => "errors/401", :status => 401 #, :layout => 'application'
}
# format.js { render :json => { :errors => [exception.message] }, :status => 401 }
# format.js { render :js => 'alert("Hello 401")' }
format.js { render :template => 'errors/401.js.erb' }
else
ExceptionNotifier::Notifier.exception_notification(env, exception).deliver
format.html { render :template => "errors/500", :status => 500 } #, :layout => 'im2/application' }
# format.js { render :nothing => true, :status => 500 }
format.js { render :template => 'errors/500.js.erb' }
end
end
end
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