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I haven’t posted it anywhere but would be happy to share. However, I have since discovered that rather than using the relationship field, which involved using the complicated ajax hack, using the post field, possibly inside a repeater if you want to choose multiple is MUCH easier and can be done with a replica of the post field.Would you be more interested in that?
The only problem with it over the relationship picker is post types are created at run time. Therefore, if you have custom post types you want to pick from, you will need to create a cache of the list of post types. I have added a hook to my save post to create a cache which sits in my plugin folder and would be very happy to help you do the same if you don’t know how.
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