Ruby on Rails

Rails 4, Ruby 2

Model has Card and Idiom
and Idiom belongs_to :card

In my Rails console I have an Idiom i and get the card from it:

    c=i.card

 => #<Card id: 19, ....>

Now I do:

    c.is_a?(Card)
 => false

    c.instance_of?(Card)
 => false

Ooops! Why false in both cases?

    c.class.name
 => "Card"
    c.class.name==Card.name
 => true

The class name is the same, but the class isn't? Please explain....

And now an explanation why I want to do it:

I have a function which is "overloaded", in that it's single argument
can be either of a certain clas (in my case, Card (or a subclass of
it)), or a Fixnum, and I need to distinguish between these cases.

I know that it is not the best style of querying the type of a variable
at runtime, but the only alternatives I could think of, would be to
either provide two differently named functions, or have an hash argument
with two types of keywords, and I don't like both of these solutions.
Aside from this, I'm really curious to know why is_a? doesn't  work
here.

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