kungfu321 · July 22, 2020 02:19 · Jun 27, 2015
diff --git a/error_msg.php b/error_msg.php
@@ -0,0 +1,23 @@
+<?php
+/**
+ * Display an error message at the top of the post edit screen explaining that ratings is required.
+ *
+ * Doing this prevents users from getting confused when their new posts aren't published, as we
+ * require a valid rating custom taxonomy.
+ *
+ * @param WP_Post The current post object.
+ */
+function show_required_field_error_msg( $post ) {
+	if ( 'movie' === get_post_type( $post ) && 'auto-draft' !== get_post_status( $post ) ) {
+	    $rating = wp_get_object_terms( $post->ID, 'movie_rating', array( 'orderby' => 'term_id', 'order' => 'ASC' ) );
+        if ( is_wp_error( $rating ) || empty( $rating ) ) {
+			printf(
+				'<div class="error below-h2"><p>%s</p></div>',
+				esc_html__( 'Rating is mandatory for creating a new movie post' )
+			);
+		}
+	}
+}
+
+// Unfortunately, 'admin_notices' puts this too high on the edit screen
+add_action( 'edit_form_top', 'show_required_field_error_msg' );
diff --git a/meta_box.php b/meta_box.php
@@ -0,0 +1,26 @@
+<?php
+/**
+ * Display Movie Rating meta box
+ */
+function movie_rating_meta_box( $post ) {
+	$terms = get_terms( 'movie_rating', array( 'hide_empty' => false ) );
+
+	$post  = get_post();
+	$rating = wp_get_object_terms( $post->ID, 'movie_rating', array( 'orderby' => 'term_id', 'order' => 'ASC' ) );
+	$name  = '';
+
+    if ( ! is_wp_error( $rating ) ) {
+    	if ( isset( $rating[0] ) && isset( $rating[0]->name ) ) {
+			$name = $rating[0]->name;
+	    }
+    }
+
+	foreach ( $terms as $term ) {
+?>
+		<label title='<?php esc_attr_e( $term->name ); ?>'>
+		    <input type="radio" name="movie_rating" value="<?php esc_attr_e( $term->name ); ?>" <?php checked( $term->name, $name ); ?>>
+			<span><?php esc_html_e( $term->name ); ?></span>
+		</label><br>
+<?php
+    }
+}
diff --git a/register_taxonomy.php b/register_taxonomy.php
@@ -0,0 +1,16 @@
+<?php
+/**
+ * Register 'Movie Rating' custom taxonomy.
+ */
+function register_movie_rating_taxonomy() {
+	$args = array(
+		'label'             => __( 'Rating' ),
+		'hierarchical'      => false,
+		'show_ui'           => true,
+		'show_admin_column' => true,
+		'meta_box_cb'       => 'movie_rating_meta_box',
+	);
+
+	register_taxonomy( 'movie_rating', 'movie', $args );
+}
+add_action( 'init', 'register_movie_rating_taxonomy' );
diff --git a/save_post.php b/save_post.php
@@ -0,0 +1,35 @@
+<?php
+/**
+ * Save the movie meta box results.
+ *
+ * @param int $post_id The ID of the post that's being saved.
+ */
+function save_movie_rating_meta_box( $post_id ) {
+	if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) {
+		return;
+	}
+
+	if ( ! isset( $_POST['movie_rating'] ) ) {
+		return;
+	}
+
+	$rating = sanitize_text_field( $_POST['movie_rating'] );
+
+	// A valid rating is required, so don't let this get published without one
+	if ( empty( $rating ) ) {
+		// unhook this function so it doesn't loop infinitely
+		remove_action( 'save_post_movie', 'save_movie_rating_meta_box' );
+
+		$postdata = array(
+			'ID'          => $post_id,
+			'post_status' => 'draft',
+		);
+		wp_update_post( $postdata );
+	} else {
+		$term = get_term_by( 'name', $rating, 'movie_rating' );
+		if ( ! empty( $term ) && ! is_wp_error( $term ) ) {
+			wp_set_object_terms( $post_id, $term->term_id, 'movie_rating', false );
+		}
+	}
+}
+add_action( 'save_post_movie', 'save_movie_rating_meta_box' );