snippet.rb

require 'rubygems'
require 'pp'

# -------
cond1 = {
  :type => 'transaction_field',
  :params => {
    :field => 'store_id',
    :operator => 'equals',
    :value => 9
  }
}
# -------

# AND
  # -------
  cond2 = {
    :type => 'item_field',
    :params => {
      :field => 'season',
      :operator => 'in',
      :value => ["U09", "S09"]
    }
  }
  # AND
  cond3 = {
    :type => 'item_field',
    :params => {
      :field => 'category',
      :operator => 'equals',
      :value => "dresses"
    }
  }
  # -------

  # OR

  # -------
  cond4 = {
    :type => 'item_field',
    :params => {
      :field => 'season',
      :operator => 'in',
      :value => ["S08", "F08"]
    }
  }
  # AND
    # -------
    cond5sub1 = {
      :type => 'item_field',
      :params => {
        :field => 'delivery_date',
        :operator => 'between',
        :value => ["1/1/08", "2/1/08"]
      }
    }
    # OR
    cond5sub2 = {
      :type => 'item_field',
      :params => {
        :field => 'delivery_date',
        :operator => 'between',
        :value => ["1/1/08", "2/1/08"]
      }
    }
    # -------  
  # -------

conditions = [cond1, :and, [[cond2, :and, cond3], :or, [cond4, :and, [cond5sub1, :or, cond5sub2]]]]

pp conditions