require "spec_helper"

class Foo 
  include Mongoid::Document

  field :bars, :type => Array

  before_validation :look_at_bars

  def look_at_bars
    bars
    true
  end 
end

describe 'A document with an array field' do
  it 'updates the array' do
    bars1 = %w(a b)
    bars2 = %w(x y)
    f     = Foo.create :bars => bars1

    f.reload
    f.bars.should == bars1

    f.bars = bars2
    f.save!
    f.reload
    f.bars.should == bars2

    f.delete
  end 
end

Run filtered excluding {:config=>#<Proc:./spec/spec_helper.rb:39>}

A document with an array field
  updates the array (FAILED - 1)

Failures:

  1) A document with an array field updates the array
     Failure/Error: f.bars.should == bars2
       expected: ["x", "y"]
            got: ["a", "b"] (using ==)
       Diff:
       @@ -1,2 +1,2 @@
       -["x", "y"]
       +["a", "b"]
     # ./spec/unit/array_changes_spec.rb:28:in `block (2 levels) in <top (required)>'

Finished in 0.00461 seconds
1 example, 1 failure

Failed examples:

rspec ./spec/unit/array_changes_spec.rb:17 # A document with an array field updates the array