Meta Box

Rather than duplicating the value, can't I do what I did for post_content etc and make my custom field "profile_picture" the default WP field?

Thank you Long. Custom fields code:

<?php
add_filter( 'rwmb_meta_boxes', 'your_prefix_function_name' );

function your_prefix_function_name( $meta_boxes ) {
    $prefix = '';

    $meta_boxes[] = [
        'title'     => __( 'Profile', 'your-text-domain' ),
        'id'        => 'academic_profile',
        'tab_style' => 'box',
        'type'      => 'user',
        'tabs'      => [
            'basic_info_tab'   => [
                'label' => 'Basic Info',
                'icon'  => 'dashicons-admin-users',
            ],
            'academic_profile' => [
                'label' => 'Academic Profile',
                'icon'  => 'dashicons-welcome-learn-more',
            ],
            'social_sharing'   => [
                'label' => 'Social Sharing',
                'icon'  => 'dashicons-share1',
            ],
        ],
        'fields'    => [
            [
                'name'    => __( 'Academic Title', 'your-text-domain' ),
                'id'      => $prefix . 'title',
                'type'    => 'select_advanced',
                'options' => [
                    'Dr'        => __( 'Dr', 'your-text-domain' ),
                    'Professor' => __( 'Professor', 'your-text-domain' ),
                ],
                'columns' => 3,
                'tab'     => 'basic_info_tab',
            ],
            [
                'name'    => __( 'First Name', 'your-text-domain' ),
                'id'      => $prefix . 'first_name',
                'type'    => 'text',
                'columns' => 4,
                'tab'     => 'basic_info_tab',
            ],
            [
                'name'    => __( 'Last Name', 'your-text-domain' ),
                'id'      => $prefix . 'last_name',
                'type'    => 'text',
                'columns' => 5,
                'tab'     => 'basic_info_tab',
            ],
            [
                'name'     => __( 'Pronouns', 'your-text-domain' ),
                'id'       => $prefix . 'user_pronouns',
                'type'     => 'text',
                'datalist' => [
                    'id'      => '6218edf305a2b',
                    'options' => [
                        'He/His
',
                        'She/Hers
',
                        'They/Them',
                    ],
                ],
                'tab'      => 'basic_info_tab',
            ],
            [
                'name'     => __( 'Nationality', 'your-text-domain' ),
                'id'       => $prefix . 'user_nationality',
                'type'     => 'text',
                'datalist' => [
                    'id'      => '6218edf305a41',
                    'options' => [
         
',//just took these options out as very long list
                    ],
                ],
                'tab'      => 'basic_info_tab',
            ],
            [
                'name'  => __( 'Biography', 'your-text-domain' ),
                'id'    => $prefix . 'description',
                'type'  => 'text',
                'desc'  => __( 'One sentence - keep it short and snappy', 'your-text-domain' ),
                'limit' => 280,
                'tab'   => 'basic_info_tab',
            ],
            [
                'name'         => __( 'Profile Picture', 'your-text-domain' ),
                'id'           => $prefix . 'profile_picture',
                'type'         => 'single_image',
                'force_delete' => true,
                'tab'          => 'basic_info_tab',
            ],
            [
                'name'       => __( 'University', 'your-text-domain' ),
                'id'         => $prefix . 'university',
                'type'       => 'post',
                'post_type'  => ['university'],
                'field_type' => 'select_advanced',
                'tab'        => 'academic_profile',
            ],
            [
                'name'    => __( 'Faculty', 'your-text-domain' ),
                'id'      => $prefix . 'faculty',
                'type'    => 'select_advanced',
                'options' => [
//removed these
                ],
                'columns' => 6,
                'tab'     => 'academic_profile',
            ],
            [
                'name'    => __( 'Academic Position', 'your-text-domain' ),
                'id'      => $prefix . 'academic_position',
                'type'    => 'select_advanced',
                'options' => [
             //removed options
                ],
                'columns' => 6,
                'tab'     => 'academic_profile',
            ],
            [
                'name' => __( 'University Profile Page', 'your-text-domain' ),
                'id'   => $prefix . 'university_profile',
                'type' => 'url',
                'tab'  => 'social_sharing',
            ],
            [
                'name' => __( 'Linkedin Link', 'your-text-domain' ),
                'id'   => $prefix . 'linkedin',
                'type' => 'url',
                'tab'  => 'social_sharing',
            ],
            [
                'name'    => __( 'Twitter Handle', 'your-text-domain' ),
                'id'      => $prefix . 'twitter',
                'type'    => 'text',
                'prepend' => '@',
                'tab'     => 'social_sharing',
            ],
            [
                'name' => __( 'Orchid Profile', 'your-text-domain' ),
                'id'   => $prefix . 'orchid',
                'type' => 'url',
                'tab'  => 'social_sharing',
            ],
            [
                'name' => __( 'Email', 'your-text-domain' ),
                'id'   => $prefix . 'user_email',
                'type' => 'email',
                'tab'  => 'social_sharing',
            ],
            [
                'name'              => __( 'Email Sharing', 'your-text-domain' ),
                'id'                => $prefix . 'email_sharing',
                'type'              => 'switch',
                'label_description' => __( 'Allow others to contact you', 'your-text-domain' ),
                'on_label'          => 'On',
                'off_label'         => 'Off',
                'std'               => true,
                'tab'               => 'social_sharing',
            ],
        ],
    ];

    return $meta_boxes;
}

And the code for the filter:

add_filter( 'get_avatar_url', 'mbua_get_avatar_url', 10, 3 );

function mbua_get_avatar_url( $url, $id_or_email, $args ) {
    if ( is_numeric( $id_or_email ) ) {
        $user_id = $id_or_email;
    } elseif ( is_string( $id_or_email ) && ( $user = get_user_by( 'email', $id_or_email ) ) ) {
        $user_id = $user->ID;
    } elseif ( is_object( $id_or_email ) && ! empty( $id_or_email->user_id ) ) {
        $user_id = (int) $id_or_email->user_id;
    }

    if ( empty( $user_id ) ) {
        return $url;
    }

    $custom_avatar = rwmb_meta( 'profile_picture', [ 'object_type' => 'user' ], $user_id );

       if ( ! $custom_avatar ) {
        return $url;
    }
    $url = $custom_avatar['full_url'];
    
    return $url;

I thought I had worked out the error message, and thought it was because I had not used the prefix (making my id 'academicprofile_picture') - while that got rid of the error message, it also stopped it from working!

Would you mind deleting my error code once you've seen it?

Thank you!

https://pastebin.com/HhRKJaNc

Thank you Long for the reply! But I still can't get it working...

I tried:

{
$post_author_id = get_post_field( 'post_author', $post_id );
}
$post_id = rwmb_meta( 'academics_university', ['object_type' => 'user'], $post_author_id );
echo get_the_title( $post_id )
?>

So I guess I don't know what to add in replacement to your "123" to make it work for dynamic post author. Can you advise?

Secondly, I don't really understand when I would use field post user meta versus the relationship. How do they differ - and could you possibly provide an example of how they differ?

It is likely that I will want to use additional fields from the related post to show in future $research templates

Thank you - I appreciate it.

But the above is from the post field on the custom fields form. I also created a relationship between the user and university. And was actually not sure if this part was needed or not and how to tie it in:

<?php
add_action( 'mb_relationships_init', 'your_prefix_function_name' );

function your_prefix_function_name() {
    MB_Relationships_API::register( [
        'id'         => 'relationship_user_university',
        'reciprocal' => true,
        'from'       => [
            'object_type' => 'user',
            'post_type'   => 'post',
            'taxonomy'    => 'category',
            'meta_box'    => [
                'title' => 'user_to_university_relationship',
            ],
            'field'       => [
                'name' => 'User to University Relationship',
            ],
        ],
        'to'         => [
            'object_type' => 'post',
            'post_type'   => 'university',
            'meta_box'    => [
                'title' => 'university_to_user_relationship',
            ],
            'field'       => [
                'name' => 'University to User Relationship',
            ],
        ],
    ] );
}