ruby-on-rails - Rails，按文件类型选择所有文件

Question

例如在这里我从数据库中提取一些文件名

> Item.pluck(:item_file_name)
=> ["amqp.dll", "readme.txt", "EULA.rtf", "GPL.txt", "adjperm.dll"]

如何按类型选择文件，例如

> txt = Item.where(:item_file_name => '***.txt')
and returns
=> ["GPL.txt",  "readme.txt"] #all txt files

Answer 1

这是你的解决方案：

txt = Item.select("item_file_name").where("item_file_name like (?)", "%.txt")

或者像这样

txt = Item.where("item_file_name like (?)", "%.txt").pluck(:item_file_name)

Answer 2

尝试txt = Item.where("item_file_name like (?)", ".txt%").pluck(:item_file_name)