[wp-trac] [WordPress Trac] #40012: Only add_metadata if no matching value

[WordPress Trac]

#40012: Only add_metadata if no matching value
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 Reporter:  johnjamesjacoby     |      Owner:
     Type:  defect (bug)        |     Status:  new
 Priority:  normal              |  Milestone:  Awaiting Review
Component:  Options, Meta APIs  |    Version:  2.9
 Severity:  normal              |   Keywords:  2nd-opinion
  Focuses:                      |
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 `add_metadata()` has a `$unique` parameter, but it only looks for a unique
 `meta_key` for the given object ID. I have a need to add meta-data with
 the same `meta_key` but different values, and only if that `meta_value`
 isn't already present with the same key.

 To do this now, requires:

 * Getting all meta-data for the ID by `meta_key`
 * Checking those array-values for my value
 * Bailing if it's already present, or...
 * Proceeding with `$unique` set to `false`

 It'd be lovely if `add_metadata()` either:

 * Accepted strings like `key`, `value` for the `$unique` parameter, to
 switch up the check
 * Added a second parameter for unique value in addition to a unique key

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Ticket URL: <https://core.trac.wordpress.org/ticket/40012>
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