[wp-xmlrpc] Updating Custom Fields Using metaWeblog.editPost

[David Weiss]

The 1-to-1 concept is what I'm after, too.  I think it can be handled  
without too much of an issue.  Who would ever use custom fields to  
define the same field more than once per post?

It would lead to unworkable use in the templates, unless you needed an  
array of something attached to the post.  I'm going to make a change  
to the API and try to update custom fields via post_id and meta_key  
and see how it works.  This way, I can say "Update wp_postmeta set  
meta_value = 'X' where meta_key = 'Y' and post_id = 'Z'".  All you'd  
need to do is pass in the post_id, meta_key, and meta_value.

I don't want to have to do a get for every post, then figure out which  
key is which, update the appropriate data, then do a post back to WP.   
That's too much work.