date类型转换成string类型

app/controllers/repositories_controller.rb

@@ -710,7 +710,7 @@ update
       all_author << cba.first
     end
     all_author = all_author.collect {|c| c.gsub(%r{<.+@.+>}, '') }
-    commits_by_author = repository.commits(all_author, @date_from, @date_to)
+    commits_by_author = repository.commits(all_author, "#{@date_from}", "#{@date_to}")
     Rails.logger.debug "######################################{commits_by_author}"
 
     fields = commits_by_author.collect {|r| r.first}