21. April 2018

This goes into functions.php

function myplugin_register_book_post_type() {
    $args = array(
        'public' => true,
        'label'  => 'Books',
        'show_in_rest' => true,
        'template' => array(
            array( 'core/image', array(
                'align' => 'left',
            ) ),
            array( 'core/heading', array(
                'placeholder' => 'Add Author...',
            ) ),
            array( 'core/paragraph', array(
                'placeholder' => 'Add Description...',
            ) ),
        ),
    );
    register_post_type( 'book', $args );
}
add_action( 'init', 'myplugin_register_book_post_type' );

function myplugin_register_book_post_type() {

$args = array(

'public' => true,

'label' => 'Books',

'show_in_rest' => true,

'template' => array(

array( 'core/image', array(

'align' => 'left',

) ),

array( 'core/heading', array(

'placeholder' => 'Add Author...',

) ),

array( 'core/paragraph', array(

'placeholder' => 'Add Description...',

) ),

);

register_post_type( 'book', $args );

}

add_action( 'init', 'myplugin_register_book_post_type' );