SQL ambiguous error.

app/models/post.rb

@@ -26,20 +26,20 @@ class Post < ActiveRecord::Base
       when /\Aid:(.+)/
       when /\Aid:(.+)/
         _where_list = _where_list.where(id: Regexp.last_match[1])
         _where_list = _where_list.where(id: Regexp.last_match[1])
       when /\Atitle:(.+)/
       when /\Atitle:(.+)/
-        _where_list = _where_list.where('title LIKE ?', "%#{Regexp.last_match[1]}%")
+        _where_list = _where_list.where('posts.title LIKE ?', "%#{Regexp.last_match[1]}%")
       when /\Abody:(.+)/
       when /\Abody:(.+)/
-        _where_list = _where_list.where('body LIKE ?', "%#{Regexp.last_match[1]}%")
+        _where_list = _where_list.where('posts.body LIKE ?', "%#{Regexp.last_match[1]}%")
       when /\A@(.+)/
       when /\A@(.+)/
         _where_list = _where_list.where(users: { name: Regexp.last_match[1] })
         _where_list = _where_list.where(users: { name: Regexp.last_match[1] })
       when /\A#(.+)/
       when /\A#(.+)/
         _where_list = _where_list.where(tags: { name: Regexp.last_match[1] })
         _where_list = _where_list.where(tags: { name: Regexp.last_match[1] })
       when /\Adate:(\d+)-(\d+)-(\d+)/
       when /\Adate:(\d+)-(\d+)-(\d+)/
         _date = Time.new(Regexp.last_match[1], Regexp.last_match[2], Regexp.last_match[3])
         _date = Time.new(Regexp.last_match[1], Regexp.last_match[2], Regexp.last_match[3])
-        _where_list = _where_list.where('updated_at > ? AND updated_at < ?', _date, _date + 1.day)
+        _where_list = _where_list.where('posts.updated_at > ? AND posts.updated_at < ?', _date, _date + 1.day)
       when /\Adraft:1/
       when /\Adraft:1/
         _where_list = _where_list.where(is_draft: true)
         _where_list = _where_list.where(is_draft: true)
       else
       else
-        _where_list = _where_list.where('title LIKE ? OR body LIKE ?', "%#{_query}%", "%#{_query}%")
+        _where_list = _where_list.where('posts.title LIKE ? OR posts.body LIKE ?', "%#{_query}%", "%#{_query}%")
       end
       end
     end
     end