ADD 添加定时更新实践项目的myshixun_count 和averge_star数据

lib/tasks/daily_update_star_for_shixun.rake

@@ -3,7 +3,8 @@
 namespace :daily_update_star_for_shixun do
   desc "update star count every day for shixun "
   task :execute => :environment do
-    shixuns = Shixun.select(:id, :averge_star)
+    shixuns = Shixun.select("id, averge_star")
+    shixuns = shixuns.where(id: ENV['shixun_id']) if ENV['shixun_id'].present?
 
   	shixuns.find_in_batches(batch_size: 10000) do |group|
   		update_sql = "UPDATE shixuns SET averge_star = CASE id "

lib/tasks/update_myshixuns_count_for_shixun.rake

@@ -3,8 +3,8 @@
 namespace :update_myshixuns_count_for_shixun do
   desc "update myshixuns count for shixun every day"
   task :execute => :environment do
-  	shixuns = Shixun.joins(:myshixuns).select("shixuns.id, COUNT(myshixuns.id) AS query_myshixuns_count")
+  	shixuns = Shixun.joins(:myshixuns).select("shixuns.id, COUNT(myshixuns.id) AS query_myshixuns_count").group("shixuns.id")
-  		.group("shixuns.id")
+  	shixuns = shixuns.where(id: ENV['shixun_id']) if ENV['shixun_id'].present?
 
   	shixuns.find_in_batches(batch_size: 10000) do |group|
   		update_sql = "UPDATE shixuns SET myshixuns_count = CASE id "