Save the post parent in a custom post type in Gutenberg

A plugin I’m developing registers two custom post types: Class and Student. Both are connected via the post_parent property in the Student post type (one student belongs to one class). I added a SelectControl control to the PluginDocumentSettingPanel in the Student post type edit screen to be able to set a Class for the Student. Everything is working except the saving part. The changes are not saved. Any ideas?

Thanks in advance

const { __ } = wp.i18n; const { compose } = wp.compose; const { registerPlugin } = wp.plugins; const { SelectControl } = wp.components; const { PluginDocumentSettingPanel } = wp.editPost; const { withSelect, withDispatch } = wp.data;  const applyWithSelect = withSelect( ( select ) => {     const {         getEditedPostAttribute,         getCurrentPostType     } = select( 'core/editor' );     const {         getEntityRecords     } = select( 'core' );      const parent = getEditedPostAttribute( 'parent' );      const posts = getEntityRecords( 'postType', 'class', { per_page: -1, orderby: 'title', order: 'asc', _fields: 'id,title' } )      return {         currentPostType: getCurrentPostType(),         parent: parent,         posts: posts     }; } );  const applyWithDispatch = withDispatch( ( dispatch ) => {     const { editPost } = dispatch( 'core/editor' );      return {         onUpdateParent( value ) {             editPost( { parent: Number( value ) } );         },     }; } );  function StudentOptionsPanelComponent( {     // These props are passed by applyWithSelect().     currentPostType, // current post type     parent, // current value of parent     posts, // all posts     // And these are passed by applyWithDispatch().     onUpdateParent,  // function which updates the meta restrict } ) {     if ( 'student' !== currentPostType ) {         return null;     }      if ( ! posts ) {         return __( 'Loading...', 'my-plugin' );     }      if ( posts.length === 0 ) {         return __( 'No classes found', 'my-plugin' );     }      var options = [];     options.push( {         label: __( 'Select a class...', 'my-plugin' ),         value: ''     } );      for ( var i = 0; i < posts.length; i++ ) {         options.push( {             label: posts[i].title.raw,             value: posts[i].id         } );     }      return (         <PluginDocumentSettingPanel             name='student-options'             title={ __( 'Options', 'my-plugin' ) }             className='student-options-panel'         >             <SelectControl                 label={ __( 'Select a class:', 'my-plugin' ) }                 value={ parent }                 options={ options }                 onChange={ onUpdateParent }             />         </PluginDocumentSettingPanel>     ); }  const StudentOptionsPanel = compose(     applyWithSelect,     applyWithDispatch )( StudentOptionsPanelComponent );  registerPlugin( 'student-options-panel', {     render: StudentOptionsPanel, } ); 

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how create sorting sql/php with parent

phpmyadmin

picture

index.php file

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