gistfile1.rb

# saving tiers to the DB
> market = OndemandMarket.first
> market.pricing_tiers = { :first_five_minutes => 3.0, :second_five_minutes => 2.5, :additional_minutes => 1.0 }
> market.save

# pulling tiers from the DB
> market.pricing_tiers
  { :first_five_minutes => 3.0, :second_five_minutes => 2.5, :additional_minutes => 1.0 }

# to update rows on a table
> OndemandMarket.all.each do |m| 
    m.pricing_tiers = {:first_five_minutes => 3.0, :second_five_minutes => 2.5, :additional_minutes => 1.0}
    m.ten_mile_multiplier = 1.5
    m.twenty_mile_multiplier = 1.75
    m.time_factor = 2.0
    m.save
  end

# update one row at a time
> m = OndemandMarket.find(1)
# replace the "1" with the ID for whatever record you want to update

> m.update_attributes!(:pricing_tiers => {:first_five_minutes => 3.0, :second_five_minutes => 2.5, :additional_minutes => 1.0}, :ten_mile_multiplier => 1.5, :twenty_mile_multiplier => 1.75, :time_factor => 2.0)