Nginx rewrite - convert address with parameters to NC address?

Question

Nginx

One of the sites used to have addresses with parameters like index.php?bar=foo&z=x. Now the site has been rewritten, CNC addresses, nginx is on the front.
It is necessary to register rewrites from old addresses to new ones so that the links on the Internet are not broken.
After reading, I found out that the parameter string is not passed to rewrite, but it is in the $query_string variable.
As the first option, I did this:

<pre>
if ($query_string = 'bar=foo&z=x') {
  rewrite ^(.*)$ http://site.ru/bar/foo/z/x/ permanent;
}
</pre>

But I came across the fact that the redirect actually goes to the page site.ru/bar/foo/z/x/?bar=foo&z=x , which causes this construction to fire again and loop.
Is there a more elegant solution?

Answer 1

Regarding the addition of query_string, a quote from the documentation:

If arguments are specified in the replacement string, the previous query arguments are added after them. You can opt out of this addition by specifying a question mark at the end of the replacement string:

Answer 2

sysoev.ru/nginx/docs/http/ngx_http_rewrite_module.html

If arguments are specified in the replacement string, the previous query arguments are added after them. You can opt out of this addition by adding a question mark at the end of the replacement line:
rewrite ^/users/(.*)$ /show?user=$1? last;

Answer 3

Yes, I was looking at it.
Thank you.