Rails: why is calling to_a on a string not valid in a rake task?

To duplicate the 1.8.7 functionality:

1.8.7 > 'foo'.to_a # => ['foo']

You would use:

1.9.3 > 'foo'.lines.to_a # => ['foo']

The other answers suggest #chars, which is not the same:

1.9.9 > 'foo'.chars.to_a # => ['f', 'o', 'o']

In ruby 1.9, String no longer has a to_a method. Your older code probably used Ruby 1.8, which did.

String objects do not have to_a. See here: http://ruby-doc.org/ruby-1.9/classes/String.html

You can use:

"foo".chars.to_a

Which results in:

["f","o","o"]

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