Undefined Error in Ruby on Rails Project - ruby-on-rails

Question

I am pretty new to Rails and I have stumbled upoun this problem. I'm guessing it's going to be relatively simple to you pros. I have a model named User and this has all the user attributes in it. I also created a model called list and now I want to. I am now trying to call the method create from the user buy doing something like this below (all happening in the console)
sample = User.create(#attributes here)
newlist = sample.List.create(#attributes here)
i then get this error
irb(main):011:0> sample.Lists.new
NoMethodError: undefined method `Lists' for #<User:0x4146750>
Below are my model files for User and List
# == Schema Information
#
# Table name: users
#
# id :integer not null, primary key
# firstName :string(255)
# middleName :string(255)
# lastName :string(255)
# email :string(255)
# facebookexternalId :integer
# userType :integer
# gender :string(255)
# description :string(255)
# location :string(255)
# image :string(255)
# password :string(255)
# notificationId :string(255)
# disabled :boolean
# disabledNotes :string(255)
# city :string(255)
# country :string(255)
# joinDate :string(255)
# created_at :datetime not null
# updated_at :datetime not null
class User < ActiveRecord::Base
attr_accessible :firstName, :middleName , :lastName ,:email , :facebookexternalId, :gender , :description, :location , :image , :city, :country, :disabled
email_regex= /\A[\w+\-.]+#[a-z\d\-.]+\.[a-z]+\z/i
validates :firstName , :presence =>true,
:length => {:maximum => 45}
validates :lastName , :presence =>true,
:length => {:maximum => 45}
validates :email , :presence =>true,
:format =>{:with => email_regex},
:uniqueness => {:case_sensitive => false}
validates :description, :length => {:maximum => 140}
has_many :lists
end
Lists
# == Schema Information
#
# Table name: lists
#
# id :integer not null, primary key
# name :string(255)
# user_Id :integer
# active :boolean
# type :string(255)
# description :string(255)
# roughList :boolean
# created_at :datetime not null
# updated_at :datetime not null
#
class List < ActiveRecord::Base
belongs_to :user
end

Answer 1

You should use list in it's plural form which would be something like,
sample_user.lists.create ...
or
sample_user.lists.new
like how you named it in the :has_many