Using the expect{}.to change, isn't passing, but works in console

Question

I'm trying to test a method on my model. Running in the console works, but my rspec test does not pass. Checkout the code:

Model:

def import(master)
  hsh = master.attributes.delete_if { |k,v| k == 'id' }
  self.update_attributes(hsh)
end

Rspec test:

describe "#import" do

  let(:master) { Factory(:sheet, :work_order => 'M1234', :sample_size => 10, :sample_scheme => 'TEST#') }
  let(:wo) { Factory(:sheet, :work_order => 'W1234', :sample_scheme => 'ORIG#' ) }

  it "imports all of the attributes from the master" do
    expect { wo.import(master) }.to change( wo, :sample_scheme ).to(master.sample_scheme)
  end

end

I can't figure this out, here is the output:

'Sheet#import imports all of the attributes from the master' FAILED
sample_scheme should have been changed to "TEST#", but is now "ORIG#"

---

As I said, the code correctly imports the attributes from the master when run in the console. It's just the rspec test is failing. What am I doing wrong?

---

change to import function results in passing:

def import(master)
  hsh = master.attributes.delete_if { |k,v| k == 'id' }
  hsh.each do |k,v|
    self.update_attribute(k, v)
  end
  #self.update_attribute(:sample_scheme, hsh['sample_scheme'])
  #self.update_attributes(hsh)
end

Answer 1

The change method is use if the number change, not if data change. You need test like that

describe "#import" do

  let(:master) { Factory(:sheet, :work_order => 'M1234', :sample_size => 10, :sample_scheme => 'TEST#') }
  let(:wo) { Factory(:sheet, :work_order => 'W1234', :sample_scheme => 'ORIG#' ) }

  it "imports all of the attributes from the master" do
    wo.sample_scheme.should.not == master.sample_scheme
    wo.import(master)
    wo.sample_scheme.should == master.sample_scheme
  end

end

Answer 2

Problem was my callback. For some reason I was reloading the model in the update callback. Not sure why I had that. That explains why save was returning true and my model still looked the like the old one. Thanks to shingara for his help. He got me thinking along the lines I needed.