Implement saving quiz and questions via the REST API

includes/class-sensei-quiz.php

@@ -1473,6 +1473,70 @@ public function get_questions( $quiz_id, $post_status = 'any', $orderby = 'meta_
 
 		return $questions_query->posts;
 	}
+
+	/**
+	 * Sets the questions of a quiz. It handles all related quiz and question meta.
+	 *
+	 * @param int   $quiz_id      The quiz id.
+	 * @param array $question_ids The array of questions ids.
+	 */
+	public function set_questions( int $quiz_id, array $question_ids ) {
+		$old_question_order = get_post_meta( $quiz_id, '_question_order', true );
+		$old_question_order = empty( $old_question_order ) ? [] : array_map( 'intval', $old_question_order );
+
+		if ( $question_ids === $old_question_order ) {
+			return;
+		}
+
+		$added_questions   = array_diff( $question_ids, $old_question_order );
+		$removed_questions = array_diff( $old_question_order, $question_ids );
+
+		// Delete question meta from the questions that were removed from the quiz.
+		if ( ! empty( $removed_questions ) ) {
+			$this->delete_quiz_question_meta( $quiz_id, $removed_questions );
+		}
+
+		if ( empty( $question_ids ) ) {
+			delete_post_meta( $this->get_lesson_id( $quiz_id ), '_quiz_has_questions' );
+			delete_post_meta( $quiz_id, '_question_order' );
+
+			return;
+		}
+
+		$question_count = 1;
+		foreach ( $question_ids as $question_id ) {
+			update_post_meta( $question_id, '_quiz_question_order' . $quiz_id, $quiz_id . '000' . $question_count );
+			$question_count++;
+		}
+
+		foreach ( $added_questions as $added_question ) {
+			add_post_meta( $added_question, '_quiz_id', $quiz_id, false );
+		}
+
+		update_post_meta( $this->get_lesson_id( $quiz_id ), '_quiz_has_questions', '1' );
+		update_post_meta( $quiz_id, '_question_order', array_map( 'strval', $question_ids ) );
+	}
+
+	/**
+	 * Helper method to delete all related meta of quiz's questions.
+	 *
+	 * @param int   $quiz_id      The quiz id.
+	 * @param array $question_ids A list of quiz ids to remove the meta from.
+	 */
+	private function delete_quiz_question_meta( $quiz_id, $question_ids = null ) {
+		if ( null === $question_ids ) {
+			$question_ids = get_post_meta( $quiz_id, '_question_order', true );
+		}
+
+		if ( empty( $question_ids ) ) {
+			return;
+		}
+
+		foreach ( $question_ids as $question_id ) {
+			delete_post_meta( $question_id, '_quiz_id', $quiz_id );
+			delete_post_meta( $question_id, '_quiz_question_order' . $quiz_id );
+		}
+	}
 }
 
 

includes/data-port/models/class-sensei-import-lesson-model.php

@@ -186,14 +186,6 @@ private function set_quiz_questions( $quiz_id ) {
 			return;
 		}
 
-		if ( empty( $questions ) ) {
-			$this->delete_quiz_question_meta( $quiz_id );
-			delete_post_meta( $this->get_post_id(), '_quiz_has_questions' );
-			delete_post_meta( $quiz_id, '_question_order' );
-
-			return;
-		}
-
 		$question_import_ids = array_unique( Sensei_Data_Port_Utilities::split_list_safely( $questions, true ) );
 		$question_ids        = [];
 
@@ -215,54 +207,7 @@ private function set_quiz_questions( $quiz_id ) {
 			$question_ids[] = $question_id;
 		}
 
-		$old_question_order = get_post_meta( $quiz_id, '_question_order', true );
-		$old_question_order = empty( $old_question_order ) ? [] : array_map( 'intval', $old_question_order );
-
-		if ( $question_ids === $old_question_order ) {
-			return;
-		}
-
-		$added_questions   = array_diff( $question_ids, $old_question_order );
-		$removed_questions = array_diff( $old_question_order, $question_ids );
-
-		// Delete question meta from the questions that were removed from the quiz.
-		if ( ! empty( $removed_questions ) ) {
-			$this->delete_quiz_question_meta( $quiz_id, $removed_questions );
-		}
-
-		$question_count = 1;
-		foreach ( $question_ids as $question_id ) {
-			update_post_meta( $question_id, '_quiz_question_order' . $quiz_id, $quiz_id . '000' . $question_count );
-			$question_count++;
-		}
-
-		foreach ( $added_questions as $added_question ) {
-			add_post_meta( $added_question, '_quiz_id', $quiz_id, false );
-		}
-
-		update_post_meta( $this->get_post_id(), '_quiz_has_questions', '1' );
-		update_post_meta( $quiz_id, '_question_order', array_map( 'strval', $question_ids ) );
-	}
-
-	/**
-	 * Helper method to delete all related meta of quiz's questions.
-	 *
-	 * @param int   $quiz_id      The quiz id.
-	 * @param array $question_ids A list of quiz ids to remove the meta from.
-	 */
-	private function delete_quiz_question_meta( $quiz_id, $question_ids = null ) {
-		if ( null === $question_ids ) {
-			$question_ids = get_post_meta( $quiz_id, '_question_order', true );
-		}
-
-		if ( empty( $question_ids ) ) {
-			return;
-		}
-
-		foreach ( $question_ids as $question_id ) {
-			delete_post_meta( $question_id, '_quiz_id', $quiz_id );
-			delete_post_meta( $question_id, '_quiz_question_order' . $quiz_id );
-		}
+		Sensei()->quiz->set_questions( $quiz_id, $question_ids );
 	}
 
 	/**