Rails - Aug 2014 - Restarting Terminal when creating new attribute in atom question

Hi All,

I just started the UT on Rails class through reddit and am completely new 
to programing.  I apologize for not being able to articulate my problem 
clearly.  I am watching this 
video https://www.youtube.com/watch?v=EU98yHB-_7A and at 16:18 when the 
instructor restarts something (terminal) I get completely lost.  He 
consules back into rails after this restart but when I do this I get this:

"User.last.cars

  *User Load (0.4ms)*  *SELECT  "users".* FROM "users"  
ORDER BY
"users"."id" DESC LIMIT 1*

NoMethodError: undefined method `cars' for #<User:0x00......."


I apologize again for the poorly asked question but I am really new with 
all of this.

Thanks so much!


Happy labor day!

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