problems defining embeds_many

[sellittf]

Hi,

embedding one model with embeds_one works fine!

however following the example of embeds_many :rooms doesn't work as expected.
Error message:
ArgumentError: Passing string to define a callback is not supported. See the .set_callback documentation to see supported values.

thanks for your job!

[Dahlgren]

Should be fixed by aa1d6c0, version 1.0.2