Hooking into get_post_metadata and add_post_metadata

This topic has 6 replies, 3 voices, and was last updated 4 years, 10 months ago by Anh Tran.

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January 15, 2020 at 3:56 PM #17847

COMCEPT
Participant

Hello, I'm trying to hook into the get_post_metadata to read from the custom table for specific post types. Also, for said post types, I'd like to hook into the add_post_metadata so I can save into the custom table, possibly using MB functions.

What MB functions should I use to do such operations inside those hooks?

Specifically I'm trying to get Polylang to read/save metadata from/to custom tables when adding a translation. I've read the code and it uses those hooks so I thought I'd hook into those, using MB functions.

Any suggestion on how to do that?

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January 16, 2020 at 3:26 AM #17857

Dave
Participant

I've got the same issue.

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January 16, 2020 at 2:25 PM #17860
Anh Tran
Keymaster
Hi Daniele & Dave,

You can use raw SQL code to read and write data to your custom table. It's simple like this:
```
// Read
global $wpdb;
$value = $wpdb->get_var( 'SELECT field_id FROM your_table WHERE ID=123' );

// Write
global $wpdb;
$wpdb->update( 'your_table', ['field_id' => $value], ['ID' => 123] );
```
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January 16, 2020 at 5:02 PM #17865

COMCEPT
Participant

Thank you Anh,

I was hoping for some sort of higher level approach; an API responsible for retrieving/storing metadata from/to custom tables (for a specific post id) with some kind of validation, sanitization, serialization and so on. Maybe a set of functions/wrappers to take into account the way Meta Box stores the fields. Is this low-level approach the only possible one?

Thank you

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January 16, 2020 at 8:15 PM #17867

Dave
Participant

So this will work but is difficult. I’m trying to programmatically create a new taxonomy term, of it does not already exist, and save the term in a taxonomy_advanced field in a custom table. I’ve been digging into the plugin files to figure out how this is done by default. I’m thinking I can call the ‘value’ method on the advanced taxonomy class?

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January 17, 2020 at 1:55 AM #17870
Dave
Participant
This is what I got working
```
if (empty(rwmb_get_value('idea_source', null, $post_id ))) {
                $term = get_term_by('slug', strtolower($tweet_info['source']), 'idea-source');
    
                if (!$term) {       
                    $term = wp_insert_term( $tweet_info['source'], 'idea-source', null );
                } 

                $term = isset( $term['term_id'] ) ? $term['term_id'] : null;
                
                $post_data['source_tax'] = $term;
            }
```
Later on I did this

$wpdb->update('TABLE_NAME', $post_data, array( 'ID' => $post_id));

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January 18, 2020 at 8:59 AM #17887

Anh Tran
Keymaster

@COMCEPT: currently, it's the only solution. We'll add more higher API to the plugin in future releases.

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