课程500问题

app/helpers/courses_helper.rb

@@ -14,21 +14,30 @@ module CoursesHelper
 
 
   # 推荐的精品课程
-  def excellent_course_recommend current_course
-    q = "%#{current_course.name.strip}%"
-    recomment_courses = []
-    # 推荐过程过滤掉自身
-    sql = "SELECT distinct c.* FROM course_activities cs, courses c where cs.course_id = c.id
-         and (c.is_excellent =1 or c.excellent_option =1) and c.is_public = 1 and c.id != #{current_course.id} order by cs.updated_at desc;"
-    ex_courses = Course.find_by_sql(sql)
-    # 使用课程的tag去和课程名称进行匹配
-    c_courses = ex_courses.select{|ex_course| ex_course.tags.any?{|tag| q.include?(tag.to_s)}}
-    if c_courses.count < 3
-      results = c_courses.length == 0 ? ex_courses.first(3) : (c_courses + ex_courses.first(3 - ex_courses.count))
-    else
-      results = c_courses.first(3)
+  def excellent_course_recommend new_course
+    q = "%#{new_course.name.strip}%"
+    result = find_excelletn_course(q, new_course)
   end
-    results
+
+  # 查询符合条件的精品课程
+  # 用新课程名去匹配精品课程中按课程名和Tag名
+  def find_excelletn_course keywords, current_course
+    # 获取tag匹配结果ID
+    a_tags = []
+    Course.where("is_excellent =? and is_public =?", 1, 1).each do |ec|
+      if ec.tags.any?{|value| current_course.name.include?(value.to_s)}
+        a_tags << ec.id
+      end
+    end
+    # 课程本身不能搜索显示自己
+    excellent_ids = a_tags.uniq.delete_if{|i| i == current_course.id}
+    sql = "SELECT distinct c.id FROM course_activities cs, courses c where cs.course_id = c.id
+         and (c.is_excellent =1 or c.excellent_option =1) and c.is_public = 1 and c.id != #{current_course.id} order by cs.updated_at desc;"
+    default_ids = Course.find_by_sql(sql).flatten.map { |c| c.id }
+    excellent_ids << default_ids.flatten
+    arr_result = excellent_ids.flatten.uniq.first(3)
+    excellent_courses = Course.find(arr_result)
+    return excellent_courses
   end
 
   # 判断精品课程是否可见，非课程成员无法查看私有课程