gistfile1.rb

# An account has payment methods.  I'd like to know the payment methods for an account
# which meet some criteria.


# The 2 models
class Account
  include Ripple::Document

  many :payment_methods
end


class PaymentMethod
  include Ripple::Document

  one :account
  property :storage_state, String
end


# In Active Record I can do the following:
account = Account.first
account.payment_methods.retained

# since there can be a named scope such as:
class PaymentMethod
  scope :retained, :conditions => [ "storage_state = ?", "retained" ]
end


# I'm wondering what the best way might be to do this in Riak.

It appears that this line:
map("Ripple.mapKeysByFields", :arg => {:storage_state => "retained"})

Is equivalent to:
map("Ripple.filterByConditions", :arg => {:storage_state => { "==" => "retained" }})

I'm now looking into the best way to do something like this for Times:

class Account
  include Ripple::Document

  property :charged_for_storage_at, Time
end

map("Ripple.filterByConditions", :arg => {:charged_for_storage_at => { "<" => 1.month.ago }})

I need to look at Ripple and determine how Times are represented and what I need to pass in rather than (1.month.ago).

Currently it uses the format that is best supported by Date.parse in Javascript. My experience in the past has been that Unix UTC timestamps have the best reliability, but I'm open to suggestions.

OK. Got it working! Now it's time to clean it up.

Thanks Sean!

Can I expect a pull request from you soon? hint hint

We'll see! I've been a bit surprised how little querying I've needed to do for the app I'm working on. At this point, I'm in "get some things working" mode. I'm now querying for strings and dates. I don't yet have enough real uses of querying in real apps to have a worthy pull request ready. I would think that would change over time. :)