完成精品课程推荐

过滤掉私有课程
过滤掉已删除的课程

app/helpers/courses_helper.rb

@@ -21,16 +21,10 @@ module CoursesHelper
   # 查询符合条件的精品课程
   def find_excelletn_course keywords, course
     # 用新课程名去匹配精品课程中按课程名和Tag名
-    if !course.is_public? && !User.current.member_of_course?(course)
-      sql = "SELECT distinct c.* FROM `courses` c, tags t, taggings ts where t.id = ts.tag_id and ts.taggable_id = c.id  and c.is_excellent = 1 and is_delete = 0 and
+    sql = "SELECT distinct c.* FROM `courses` c, tags t, taggings ts where t.id = ts.tag_id and ts.taggable_id = c.id  and c.is_excellent = 1 and is_delete = 0 and
           ts.taggable_type = 'Course' and (t.name like '%#{keywords}%'or c.name like '%#{keywords}%')"
-      resultSetTag =  Course.find_by_sql(sql)
-    else
-      sql = "SELECT distinct c.* FROM `courses` c, tags t, taggings ts where t.id = ts.tag_id and ts.taggable_id = c.id  and c.is_excellent = 1 and is_delete = 0 and
-          ts.taggable_type = 'Course' and (t.name like '%#{keywords}%'or c.name like '%#{keywords}%') ORDER BY c.updated_at desc limit 0,5;"
-      resultSetTag = Course.visible.find_by_sql(sql)
-    end
-
+    resultSetTag =  Course.find_by_sql(sql).select{|e_course| e_course.is_public ==1 unless User.current.member_of_course?(e_course)}.first(3)
+    resultSetTag
   end
 
   # 判断精品课程是否可见，非课程成员无法查看私有课程