Ruby on Rails

My form fails with the error Mysql2::Error: Column 'date_of_birth' cannot be null. However the Request Parameters have a value for date_of_birth, so i'm not sure whats going on. 

Request:

    {"utf8"=>"✓",   "authenticity_token"=>"3njnNBX4VgoV32kau3OALfhdIP00Bq78we6EKD7OXHo=",   "pilgrim"=>{"surname"=>"Lorem",   "first"=>"Ipsum",   "middle"=>"Lorem",   "aka"=>"Lorem",   "title"=>"Mrs. ",   "address"=>"111 Mockingbird Lane",   "city"=>"City",   "state"=>"CA",   "email"=>"loremipsum@gmail.com",   "telephone"=>"889-279-2727",   "nationality"=>"USA",   "passport_number"=>"123455",   "expiration"=>"06-15-2015",   "date_of_birth"=>"06-15-1086",   "jordan"=>"yes",   "room"=>"Share",   "leader"=>"Group Leader",   "price"=>"4000",   "deposit"=>"500",   "trip_id"=>"44",   "balance"=>"3500"},  

"commit"=>"Save"}

Here's a gist with the form and controller code that's causing the issue. 

https://gist.github.com/4429457

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