Solution #1 – home brew
You could
- add a metabox using
add_meta_box()Example on the bottom of that link. - In your MetaBox callback you could add a Query like this one, but for posts
- Then use the jQuery UI Autocomplete plugin that is shipped with WordPress like explained in that answer.
Solution #2 – from the super market
But you could as well use “Posts2Posts” which can be found
- in the official repo on wp.org
- or on GitHub where you’ll find extensive tutorials in the Wiki and help in the questions/issues list.
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