It bothers me a lot each time I'm creating a Rails model which holds a reference to a file, because Rails does not allow the word "File". Any alternative solutions, what are the big Rails apps using?
Rails reserved names
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Re: Rails reserved names
#2File is the Ruby representation of the file class. It is a Very Bad Idea to reuse that name as is.
Reusing names defined in Ruby stdlib classes is a bad idea. Name the model after what the file is used for, eg LockFile.
Another option if you absolutely have to use that name, wrap it in a module, eg
module Foo
class File