作业积分出现负分

app/controllers/courses_controller.rb

@@ -1079,7 +1079,7 @@ class CoursesController < ApplicationController
     sql_select = ""
     if groupid == 0
       sql_select = "SELECT members.*,(
-          SELECT SUM(IF(student_works.final_score IS NULL,NULL,IF(student_works.final_score =0,0,student_works.final_score - student_works.absence_penalty - student_works.late_penalty)))
+          SELECT SUM(IF(student_works.final_score IS NULL,NULL,IF(student_works.final_score =0,0,IF((student_works.final_score - student_works.absence_penalty - student_works.late_penalty) < 0 , 0, student_works.final_score - student_works.absence_penalty - student_works.late_penalty))))
           FROM student_works,homework_commons
           WHERE student_works.homework_common_id = homework_commons.id
           AND homework_commons.course_id = #{@course.id}
@@ -1091,7 +1091,7 @@ class CoursesController < ApplicationController
         WHERE members.course_id = #{@course.id} ORDER BY score #{score_sort_by}"
     else
       sql_select = "SELECT members.*,(
-          SELECT SUM(IF(student_works.final_score IS NULL,NULL,IF(student_works.final_score =0,0,student_works.final_score - student_works.absence_penalty - student_works.late_penalty)))
+          SELECT SUM(IF(student_works.final_score IS NULL,NULL,IF(student_works.final_score =0,0,IF((student_works.final_score - student_works.absence_penalty - student_works.late_penalty) < 0 , 0, student_works.final_score - student_works.absence_penalty - student_works.late_penalty))))
           FROM student_works,homework_commons
           WHERE student_works.homework_common_id = homework_commons.id
           AND homework_commons.course_id = #{@course.id}

app/helpers/courses_helper.rb

@@ -865,7 +865,7 @@ module CoursesHelper
   # 学生按作业总分排序，取前8个
   def hero_homework_score(course, score_sort_by)
     sql_select = "SELECT members.*,(
-          SELECT SUM(IF(student_works.final_score is null,null,IF(student_works.final_score = 0, 0, student_works.final_score - student_works.absence_penalty - student_works.late_penalty)))
+          SELECT SUM(IF(student_works.final_score IS NULL,NULL,IF(student_works.final_score =0,0,IF((student_works.final_score - student_works.absence_penalty - student_works.late_penalty) < 0 , 0, student_works.final_score - student_works.absence_penalty - student_works.late_penalty))))
           FROM student_works,homework_commons
           WHERE student_works.homework_common_id = homework_commons.id
           AND homework_commons.course_id = #{course.id}

app/models/member.rb

@@ -158,7 +158,7 @@ class Member < ActiveRecord::Base
   end
 
   def student_work_score_sum
-    sql_select = "SELECT (SUM(IF(student_works.final_score IS NULL,NULL,IF(student_works.final_score =0,0,student_works.final_score - student_works.absence_penalty - student_works.late_penalty)))) as score
+    sql_select = "SELECT (SUM(IF(student_works.final_score IS NULL,NULL,IF(student_works.final_score =0,0,IF((student_works.final_score - student_works.absence_penalty - student_works.late_penalty) < 0 , 0, student_works.final_score - student_works.absence_penalty - student_works.late_penalty))))) AS score
           FROM student_works,homework_commons
           WHERE student_works.homework_common_id = homework_commons.id
           AND homework_commons.course_id = #{self.course_id}

app/views/courses/_show_member_score.html.erb

@@ -24,7 +24,7 @@
               </span>
               <span class="c_red w70">
                 <% final_score = @member_score.homework_common_score(homework_common).first%>
-                <%= final_score.nil? || final_score.final_score.nil? ? "--" : format("%0.2f", final_score.final_score) %>
+                <%= final_score.nil? || final_score.final_score.nil? ? "--" : format("%0.2f", final_score.final_score < 0 ? 0 : final_score.final_score) %>
               </span>
             </li>
        <% end %>