Rails 5 redirect_back with url query parameter option

Question

According to the docs:

redirect_back(fallback_location:, allow_other_host: true, **args)

:fallback_location- The default fallback location that will be used on missing Referer header.

:allow_other_host - Allow or disallow redirection to the host that is different to the current host, defaults to true.

All other options that can be passed to redirect_to are accepted as options and the behavior is identical.

And redirect_to allows me to add params to the url just by passing them as a hash

So, why do none of these work for me:

redirect_back fallback_location: tasks_path, allow_other_host: false, syncing: true

redirect_back fallback_location: tasks_path, allow_other_host: false, { syncing: true }

redirect_back fallback_location: tasks_path, allow_other_host: false, options: { syncing: true }

redirect_back(fallback_location: tasks_path, allow_other_host: false, options: { syncing: true })

redirect_back(fallback_location: tasks_path, allow_other_host: false, syncing: true)

...and any other iteration on the above that I could think of.

All of them (that are valid code), just return me back without the added parameter

I'm trying to achieve this URL: (back_url or fallback_location) + '?syncing=true'

Answer 1

If you look at the source code for redirect_back you will see, that it essentially uses redirect_to "whatever_url.com" version of redirect_to method.

If you check the explanation of redirect_to you can see that in this use case you unfortunately cannot pass any arguments. If this is super needed, I guess you could just override the redirect_back method to append params option to the url with string concatenation, but that seems like a nasty fix.

But to answer your question - what you want to achieve seems to be impossible out of the box.