Rails 3 - populate database using irb
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Rails 3.2.3

My need is populating a database using an easiest way.
So I created a model

    rails g model MyModelName title:string, another_title:string, description:text
Now I'm trying to populate a database some data using irb

    mm = MyModelName.create :title =>'title1', :another_title=>'fdfds', :description =>'desc1 fdsfds'

But here is an error

    NameError: uninitialized constant MyModelName
    	from (irb):4
    	from /home/alex/.rvm/rubies/ruby-1.9.3-p194/bin/irb:16:in `<main>'

How do I solve it? 
