RSpec Model Testing: Failures - ruby-on-rails-4

Question

I am teaching myself RSpec (v3.1.7). I have installed rspec with rails g rspec:install into an existing rails app - freshly created.
I created a model: rails g rspec:model zombie. Ran the migration and all went well.
In: app/models/zombie.rb:
class Zombie < ActiveRecord::Base
validates :name, presence: true
end
In: app/spec/models/zombie_spec.rb:
require 'rails_helper'
RSpec.describe Zombie, :type => :model do
it 'is invalid without a name' do
zombie = Zombie.new
zombie.should_not be_valid
end
end
In terminal when I ran (in the app dir): rspec spec/models I get:
F
Failures:
1) Zombie is invalid without a name
Failure/Error: zombie.should_not be_valid
NoMethodError:
undefined method `name' for #<Zombie id: nil, created_at: nil, updated_at: nil>
# ./spec/models/zombie_spec.rb:6:in `block (2 levels) in <top (required)>'
Im following a video tutorial and I followed the video (Testing with RSpec) down to the latter. I'm like losing weight on the 2nd chapter. Am I missing something? Is the video using an older version of rspec for their video tutorial?
In my migration file:
class CreateZombies < ActiveRecord::Migration
def change
create_table :zombies do |t|
t.timestamps
end
end
end

Answer 1

Your model don't know what name is since you did not define the attribute in your migration:
class CreateZombies < ActiveRecord::Migration
def change
create_table :zombies do |t|
t.string :name
t.timestamps
end
end
end
Then run:
rake db:migrate
Then this should work fine:
z = Zombie.new(name: 'foo')
z.name
=> 'foo'

Answer 2

I think you are missing the name attribute. The following migration file will add name attribute to zombie model:
class AddNameToZombies < ActiveRecord::Migration
def change
add_column :zombies, :name, :string
end
end
finally run the following commands:
rake db:migrate
rake db:test:prepare
and that's it