Rails - Jan 2010 - ActiveRecord setting has_many association

Hi,

Can someone help me with this, why does it not work when the association
is already set, shouldn''t it be overridden?

require ''rubygems''
require ''activerecord''

ActiveRecord::Base.establish_connection(:adapter =>
''sqlite3'', :database
=> '':memory:'')

class Rider < ActiveRecord::Base
  connection.create_table :riders, :force => true do |t|
    t.string :name
  end

  has_many :starts
end

class Start < ActiveRecord::Base
  connection.create_table :starts, :force => true do |t|
    t.string :class_no
    t.integer :rider_id
  end

  belongs_to :rider
end


# Why is not this true?
other_rider = Rider.create
start = Start.new(:rider => other_rider)
rider = Rider.create(:starts => [start])
puts rider.starts.reload.size == 1 # => false

# This works
rider = Rider.create(:starts => [Start.create])
puts rider.starts.reload.size == 1 # => true

# And this
rider = Rider.create(:starts => [Start.create(:rider_id =>
Rider.create.id)])
puts rider.starts.reload.size == 1 # => true

Thanks
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