dd

app/helpers/exercises_helper.rb

@@ -164,7 +164,7 @@ module ExercisesHelper
           question_answer_infos.push(answer_option)
         end
       elsif ex.question_type == Exercise::COMPLETION  #填空题
-        effictive_users_count = effictive_users.where("answer_text is not null").pluck(:user_id).uniq.size
+        effictive_users_count = effictive_users.where("answer_text is not null and answer_text !=''").pluck(:user_id).uniq.size
         ex_ordered = ex.is_ordered
         null_standard_answer = ex.exercise_standard_answers
         null_stand_choice = null_standard_answer.pluck(:exercise_choice_id)  #一个exercise_choice_id可能对应多个answer_text