--- a/src/lib/Course.luan	Fri Aug 15 23:24:38 2025 +0900
+++ b/src/lib/Course.luan	Sat Aug 16 09:56:10 2025 +0900
@@ -23,6 +23,7 @@
 		ai_system_prompt = doc.ai_system_prompt
 		ai_first_message = doc.ai_first_message
 		tts_instructions = doc.tts_instructions
+		has_ruby = doc.has_ruby == "true"
 	}
 end
 
@@ -37,6 +38,7 @@
 		ai_system_prompt = course.ai_system_prompt or error()
 		ai_first_message = course.ai_first_message
 		tts_instructions = course.tts_instructions
+		has_ruby = course.has_ruby and "true" or nil
 	}
 end