*scratch*

ruby-1.9.2-p136 :001 > j = Job.last
ruby-1.9.2-p136 :002 > j.file_data.file.gridio.class
 => Mongo::GridIO 
ruby-1.9.2-p136 :003 > CSV.new(j.file_data.file.gridio)
NoMethodError: undefined method `pos' for #<GridIO _id: 4d5cbe235ef0dbcaf2000001>
	from /Users/rchristie/.rvm/rubies/ruby-1.9.2-p136/lib/ruby/1.9.1/csv.rb:2011:in `init_separators'
	from /Users/rchristie/.rvm/rubies/ruby-1.9.2-p136/lib/ruby/1.9.1/csv.rb:1570:in `initialize'
	from (irb):3:in `new'
	from (irb):3
	from /Users/rchristie/dev/cast/vendor/ruby/1.9.1/gems/railties-3.0.4/lib/rails/commands/console.rb:44:in `start'
	from /Users/rchristie/dev/cast/vendor/ruby/1.9.1/gems/railties-3.0.4/lib/rails/commands/console.rb:8:in `start'
	from /Users/rchristie/dev/cast/vendor/ruby/1.9.1/gems/railties-3.0.4/lib/rails/commands.rb:23:in `<top (required)>'
	from script/rails:6:in `require'
	from script/rails:6:in `<main>'
ruby-1.9.2-p136 :004 > 


# It looks like the deprecated API, GridStore, used to support the methods like eof?, pos, and rewind so that I could
# essentially stream the file from Mongo into some consumer of that stream. I haven't tried going back to the older
# version of the driver or implementing the needed methods yet. I was just trying to find some background on why 
# that API was deprecated. 

Thanks. I'll put submit a pull request for the others.