课程学生列表功能

app/api/mobile/apis/courses.rb

@@ -240,6 +240,18 @@ module Mobile
           present :status, 0
         end
 
+        desc '课程学生'
+        params do
+          requires :token,type:String
+          requires :course_id,type:Integer,desc: '课程id'
+        end
+        get ":course_id/members" do
+          cs = CoursesService.new
+          count = cs.course_members params
+          present :data, count, with: Mobile::Entities::Member
+          present :status, 0
+        end
+
       end
     end
   end

app/api/mobile/entities/course.rb

@@ -46,6 +46,7 @@ module Mobile
       course_expose :term
       course_expose :time
       course_expose :updated_at
+      course_expose :course_student_num
       expose :teacher, using: Mobile::Entities::User do |c, opt|
         if c.is_a? ::Course
           c.teacher

app/services/courses_service.rb

@@ -169,7 +169,7 @@ class CoursesService
     unless (course.is_public == 1 ||  current_user.member_of_course?(course) || current_user.admin?)
       raise '403'
     end
-    {:course => course,:work_unit => work_unit, :img_url => url_to_avatar(course),:current_user_is_member => current_user.member_of_course?(course),:current_user_is_teacher => is_course_teacher(current_user,course)}
+    {:course => course,:work_unit => work_unit, :img_url => url_to_avatar(course),:current_user_is_member => current_user.member_of_course?(course),:current_user_is_teacher => is_course_teacher(current_user,course),:course_student_num => course ? course.student.count.to_s : 0}
   end
 
   #创建课程
@@ -439,6 +439,11 @@ class CoursesService
      result
    end
 
+  # 课程学生列表
+  def course_members params
+    @all_members = student_homework_score(0,params[:course_id], 10,"desc")
+  end
+
   private
   def show_homework_info course,bid,current_user,is_course_teacher
     author_real_name = bid.author.lastname + bid.author.firstname
@@ -476,5 +481,52 @@ class CoursesService
   end
 
 
+  def student_homework_score(groupid,course_id, nums, score_sort_by)
+    #teachers = find_course_teachers(@course)
+    #start_from = start_from * nums
+    sql_select = ""
+    if groupid == 0
+      if nums == 0
+        sql_select = "SELECT members.*, SUM(homework_attaches.score) as score FROM members, homework_attaches
+            WHERE members.course_id = #{course_id} AND members.user_id in (SELECT students_for_courses.student_id FROM students_for_courses WHERE course_id = #{course_id}) AND members.user_id = homework_attaches.user_id
+        AND homework_attaches.bid_id in (SELECT bid_id FROM homework_for_courses WHERE course_id = #{course_id}) GROUP BY members.user_id
+        UNION all
+        SELECT members.*, 0 as  score FROM members,homework_attaches,students_for_courses WHERE members.course_id = #{course_id} AND
+        students_for_courses.course_id = #{course_id} and members.user_id = students_for_courses.student_id AND
+        members.user_id NOT IN (SELECT homework_attaches.user_id FROM homework_attaches WHERE homework_attaches.bid_id in (SELECT bid_id FROM homework_for_courses WHERE course_id = #{course_id} )
+        )
+        GROUP BY members.user_id ORDER BY score #{score_sort_by}"
+      else
+        sql_select = "SELECT members.*, SUM(homework_attaches.score) as score FROM members, homework_attaches
+            WHERE members.course_id = #{course_id} AND members.user_id in (SELECT students_for_courses.student_id FROM students_for_courses WHERE course_id = #{course_id}) AND members.user_id = homework_attaches.user_id
+        AND homework_attaches.bid_id in (SELECT bid_id FROM homework_for_courses WHERE course_id = #{course_id})  GROUP BY members.user_id
+        UNION all
+        SELECT members.*, 0 as  score FROM members,homework_attaches,students_for_courses WHERE members.course_id = #{course_id} AND
+        students_for_courses.course_id = #{course_id} and members.user_id = students_for_courses.student_id AND
+        members.user_id NOT IN (SELECT homework_attaches.user_id FROM homework_attaches WHERE homework_attaches.bid_id in (SELECT bid_id FROM homework_for_courses WHERE course_id = #{course_id} )
+        )
+        GROUP BY members.user_id ORDER BY score #{score_sort_by} " #limit #{start_from}, #{nums}"
+
+      end
+    else
+      sql_select = "SELECT members.*, SUM(homework_attaches.score) as score FROM members, homework_attaches
+        WHERE members.course_id = #{course_id} AND members.user_id in (SELECT students_for_courses.student_id FROM students_for_courses WHERE course_id = #{course_id}) AND members.user_id = homework_attaches.user_id
+        and members.course_group_id = #{groupid} AND homework_attaches.bid_id in (SELECT bid_id FROM homework_for_courses WHERE course_id = #{course_id})
+        GROUP BY members.user_id
+        UNION all
+        SELECT members.*, 0 as  score FROM members,homework_attaches,students_for_courses WHERE members.course_id = #{course_id}
+        and members.course_group_id = #{groupid} AND
+        students_for_courses.course_id = #{course_id} and members.user_id = students_for_courses.student_id AND
+        members.user_id NOT IN (SELECT homework_attaches.user_id FROM homework_attaches WHERE homework_attaches.bid_id in (SELECT bid_id FROM homework_for_courses WHERE course_id = #{course_id} )
+        )
+        GROUP BY members.user_id ORDER BY score #{score_sort_by}"
+    end
+    sql = ActiveRecord::Base.connection()
+    homework_scores = Member.find_by_sql(sql_select)
+    sql.close()
+
+    homework_scores
+  end
+
 
 end