public function store()
  {
         // move this to a "emailExists() method or something.
        if (Farmer::where('email', Input::get('email')->first()) {
                return $farmer->id;
  	}

    // bad (use validation, input::only, or make sure you guard eloquent model)
    $arr = Input::all();

    // use a mutator on your model and get rid of this line also
    $arr['dob'] = \Carbon::createFromTimeStamp(strtotime($arr['dob'])));

    return $this->respondCreated(Farmer::create($arr));
}