How to make the tests pass in an elegant way? Ruby on Rails

I am writing a rails app with my colleague who wrote a lot of the tests.
He had to take a leave of absence due to a death in his family, and I am
needing helps with changing the model so that the tests will pass in our
spec file.

Here is the model:

class Worker < ActiveRecord::Base
  attr_accessible :first_name, :last_name

  has_many :writings
end

Here is the spec:

require 'spec_helper.rb'

describe Worker do
  describe "merging two workers" do
    before(:each) do
      @writing1 = Writing.create!(:writing_text => "Winner's note")
      @writing2 = Writing.create!(:writing_text => "Loser's note")

      @winner = Worker.create!(:first_name => "Jim", :last_name =>

“Sullivan”, :email => “[email protected]”)
@winner.writings << @writing1

      @loser  = Worker.create!(:first_name => "Tom", :last_name =>

“Smithe”
@loser.writings << @writing2

      @result = Worker.merge(@winner, @loser)
    end

    it "should return the winner" do
      @result.id.should eq @winner.id
    end

    it "should not edit the winner's name" do
      @result.first_name.should eq @winner.first_name
      @result.last_name.should eq @winner.last_name
    end
end
end

All of these tests are failing, and I’m not sure what to do. I don’t
want to try something and accidentally break the model, as I am new to
ruby on rails. Thanks.

Edit: Fails:

Failures:

    1) Worker merging two worker should return the winner
     Failure/Error: @result = Worker.merge(@winner, @loser)
     NoMethodError:
       undefined method `merge' for #<Class:0x007fb612ee2ff8>
     # ./spec/models/worker_spec.rb:15:in `block (3 levels) in <top

(required)>’

  2) Person merging two people should not edit the winner's name
     Failure/Error: @result = Worker.merge(@winner, @loser)
     NoMethodError:
       undefined method `merge' for #<Class:0x007fb612ee2ff8>
     # ./spec/models/worker_spec.rb:15:in `block (3 levels) in <top

(required)>’

  3) Person merging two people should merge the winner's email only

if he has no email
Failure/Error: @result = Worker.merge(@winner, @loser)
NoMethodError:
undefined method merge' for #<Class:0x007fb612ee2ff8> # ./spec/models/worker_spec.rb:15:inblock (3 levels) in <top
(required)>’

  4) Person merging two people should not edit the winner's company

name
Failure/Error: @result = Worker.merge(@winner, @loser)
NoMethodError:
undefined method merge' for #<Class:0x007fb612ee2ff8> # ./spec/models/worker_spec.rb:15:inblock (3 levels) in <top
(required)>’

  5) Person merging two people should delete the loser
     Failure/Error: @result = Worker.merge(@winner, @loser)
     NoMethodError:
       undefined method `merge' for #<Class:0x007fb612ee2ff8>
     # ./spec/models/worker_spec.rb:15:in `block (3 levels) in <top

(required)>’

  6) Person merging two people should merge the notes together
     Failure/Error: @result = Worker.merge(@winner, @loser)
     NoMethodError:
       undefined method `merge' for #<Class:0x007fb612ee2ff8>
     # ./spec/models/worker_spec.rb:15:in `block (3 levels) in <top

(required)>’

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