Nginx redirect setting - wordpress

Question

My Nginx setting currently has this:
location / {
if (!-e $request_filename){
rewrite ^/(.*)$ https://domain.com/index.php?id=$1 redirect;
}
}
Basically for non-existing pages (404) it redirects user to the home page. But now I have a wordpress blog setup at https://domain.com/blog/, but any wordpress items eg. https://domain.com/blog/test also got redirected to the home page. I wonder how to fix this?

Answer 1

to do something different for requested url's whose path starts with '/blog/' add a corresponding location like so:
location / {
if (!-e $request_filename){
rewrite ^/(.*)$ https://domain.com/index.php?id=$1 redirect; }
}
location /blog/ {
#add in whatever directives are needed to serve your wordpress
}

Answer 2

You shouldn't be using an if. Please read the IfIsEvil page on the nginx wiki. Instead you should be using try_files.
Your config should look more like this:
location / {
try_files $uri $uri/ #notfound
}
location #notfound {
rewrite ^(.*)$ https://domain.com/index.php?id=$1 redirect;
}
Really, you shouldn't be doing this at all. Instead you should be setting a custom error page. Redirecting every 404 to the home page is bad for your SEO.
Edit: I just realized you were passing the URL into "id". So I removed my second comment about using . instead of ^(.*)$. Still an error page is your best bet. You can pick up the URL with $_SERVER['REQUEST_URI'] (if you avoid the hard redirect).
This page has some sample configurations that may be helpful to you. It has a few wordpress configs.