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Hot cats, I’m already in love with FuseFS. And it was only dropped on ruby-talk a bushel of hours ago. See, here’s a script which mounts the ActiveRecord classes in your Rails app as a Linux filesystem.

 #!/usr/bin/env ruby 

 require 'fusefs'
 require File.dirname(__FILE__) + '/../config/environment'

 class RailsFS < FuseFS::FuseDir
   def initialize
     @classes = {}
     require 'find'
     Find.find( File.join(RAILS_ROOT, 'app/models') ) do |model|
       if /(\w+)\.rb$/ =~ model
         model = $1
         kls = Inflector.classify( model )
         ( @classes[model] = Kernel::const_get( kls ) ).
           find :first rescue @classes.delete( model )
       end
     end
   end
   def directory? path
     tname, key = scan_path path
     table = @classes[tname]
     if table.nil?; false  # /table
     elsif key;     false  # /table/id
     else; true end
   end
   def file? path
     tname, key = scan_path path
     table = @classes[tname]
     key and table and table.find( key )
   end
   def can_delete?; true end
   def can_write? path; file? path end
   def contents path
     tname, key = scan_path path
     table = @classes[tname]
     if tname.nil?; @classes.keys.sort  # /
     else; table.find( :all ).map { |o| o.id.to_s } end  # /table
   end         
   def write_to path, body
     obj = YAML::load( body )
     obj.save
   end
   def read_file path
     tname, key = scan_path path
     table = @classes[tname]
     YAML::dump( table.find( key ) )
   end 
 end

 if (File.basename($0) == File.basename(__FILE__))
   root = RailsFS.new
   FuseFS.set_root(root)
   FuseFS.mount_under(ARGV[0])
   FuseFS.run # This doesn't return until we're unmounted.
 end

Make sure you have Linux 2.4-2.6, FUSE and Ruby-FuseFS.

Save the above script as script/filesys in your Rails app. (If you’d rather not cut-and-paste the above, it’s here.)

Now, run mkdir ~/railsmnt. Then, script/filesys ~/railsmnt. The rules are as follows:

• ls ~/railsmnt will give you a list of tables.
• ls ~/railsmnt/table will list IDs from the table.
• cat ~/railsmnt/table/id will display a record in YAML.
• vim ~/railsmnt/table/id to edit the record in YAML!

See, we got your ObjFSDB right here. Now I dare you to set up an FTP site to let people upload YAML files right into your database. (Thanks to Greg Milliam for his brilliant work, more userspace filesystem ideas here.)