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Opened 7 weeks ago

Last modified 6 weeks ago

#42069 new defect (bug)

Saving metadata fails (randomly) if equal value already exists

Reported by: JVel Owned by:
Milestone: Awaiting Review Priority: normal
Severity: normal Version: 4.8.2
Component: REST API Keywords:
Focuses: rest-api Cc:


When using js rest api to save page.

Duplicate value test in wp-includes/rest-api/fields/class-wp-rest-meta-fields.php line 303 fails and causes error "Could not update meta value in database."

if ( $old_value[0] === $meta_value ) {

Problem seems to be that $old_value is not going through wp_slash but new $meta_value is.

I get it working by changing code to test against $value instead.

if ( $old_value[0] === $value ) {

Change History (1)

#1 @pilou69
6 weeks ago

Having an issue with this too in 4.8.2.

It's not random, it always happens when the meta is not modified and has any characters that must be slashed.

We found 3 ways to work around this:

  1. Apply modification above, but it overrides the core :(
    if ( $old_value[0] === $value ) {
  1. Register meta fields as single => false. But that seems very ugly.
  1. Create custom endpoint:

create a class extending WP_REST_Meta_Fields, and override update_meta_value function with patch applied above

extend WP_REST_Posts_Controller (WP_REST_{$type}_Controller),)

override in you custom endpoint controller
$this->meta with your Class with the patch

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