Get Current Stack Trace in Ruby Without Raising an Exception
I Want to Log the Current Backtrace (Stacktrace) in a Rails 3 App Without an Exception Occurring. Any Idea How? Why Do I Want This? I'm Trying to Trace the...
I want to log the current backtrace (stacktrace) in a Rails 3 app without an exception occurring. Any idea how?
Why do I want this? I'm trying to trace the calls that are made when Rails looks for a template so that I can choose a part of the process to override (because I want to change the view path for a particular subclassed controller of mine).
I'd like to call it from the file: gems\actionpack-3.2.3\lib\action_dispatch\middleware\templates\rescues\missing_template.erb. I know that's not best practice, but I know it's downstream of the stack from where the search for templates occurs.
3 Answers
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
David Miller brings 15 years of experience in global economics, personal finance strategy, and market dynamics. He specializes in turning complex economic trends into actionable insights for everyday readers.
