Rails - Mar 2012 - How do I replicate my console exercise in my view and controller?

I tried out some code in my console and I am having difficulty
translating it for my view and controller so that it gives me the same
result.
My console:

        @contract = Contract.new(authnum: "900700", st_date:
"2012-01-01",
        end_date: "2012-30-06")

        @contract.save

        @code = Code.new(code_name: "S-5463", status:
"Active",
        description: "This and That")

        @code.save

        @codeline = @code.codelines.build(:units_alloc => "80.00",
        :contract => @contract)

        @codeline.save

        @codeline
        => #<Codeline id: 91, contract_id: 64, code_id: 54, units_alloc:
        80.00>

Using pgadmin3 I check my codelines table and I get the same result
namely:

        id    contract_id    code_id   units_alloc
        91         64            54       80.00

But if I try to run this through my contracts_controller and view I get:

        id    contract_id    code_id   units_alloc
        91         64           54
        92         64                     80.00

Here are my models:

  class Contract < AR::Base
    has_many :codelines
    has_many :codes, :through => :codelines

    accepts_nested_attributes_for :codes

    attr_accessible :codes_attributes,
:codes,:authnum,:st_date,:end_date
  end

  class Codeline < AR::Base
    belongs_to :contract
    belongs_to :code
    units_alloc ...... this is the attribute I would like to set
  end

  class Code < AR::Base
    has_many :codelines
    has_many :contracts, :through => :codelines
  end

The new/create action of my app/controllers/contracts_controller.rb

  def new
    @contract = Contract.new
    @contract.codes.build
    @contract.codelines.build(:units_alloc => params[:units_alloc],
    :contract => @contract)
  end

  def create
     @contract = Contract.new(params[:contract])
     if @contract.save
       flash[:success] = "New Contract has been saved"
       redirect_to @contract
     else
       @title = "You have some errors"
       render ''new''
     end
   end

the partial for my view in app/views/contracts/_fields.html.haml

    = f.fields_for :codes do |ff|
      .field
         = ff.label :name, "Code Name"
         %br/
         = ff.text_field :code_name
      .field
      .
      .
    = f.fields_for :codelines do |ff|
      .field
        = ff.label :name, "Units Alloc"
        %br/
        = ff.text_field :units_alloc

Please have a look to see if you can help me translate my console code
into the appropriate code for my contracts_controller?

Thanks

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