rally_api query for getting defects based on iteration - ruby-on-rails

Question

I am using rally_api gem in Ruby. Could any one suggest me how to write query that gets all the defects under a particular iteration?
require 'rally_api'
headers = RallyAPI::CustomHttpHeader.new()
headers.version = "1.0"
config = {:base_url => "https://rally1.rallydev.com/slm"}
config[:username] = "mvcmxb"
config[:password] = "kjkjk"
config[:workspace] = "Persons"
config[:project] = "Business he does"
config[:headers] = headers
#rally = RallyAPI::RallyRestJson.new(config)
test_query = RallyAPI::RallyQuery.new()
test_query.type = "defect"
test_query.fetch = true
results = #rally.find(test_query)

Answer 1

Here is a code example when defects are queried by iteration and their description is updated. You may either query by iteration name:
query.query_string = "(Iteration.Name = \"i10\")"
or iteration ref:
query.query_string="(Iteration = /iteration/13589769934)"
Names are not unique, but the query is also bound by the project:
rally = RallyAPI::RallyRestJson.new(config)
query = RallyAPI::RallyQuery.new()
query.type = :defect
query.fetch = "Name,FormattedID,Iteration,Description"
query.project = {"_ref" => "https://rally1.rallydev.com/slm/webservice/v2.0/project/12352608219.js" }
query.project_scope_up = false
query.project_scope_down = false
query.order = "Name Asc"
#query.query_string = "(Iteration.Name = \"i10\")"
query.query_string="(Iteration = /iteration/13589769934)"
results = rally.find(query)
results.each do |d|
puts "FormattedID: #{d["FormattedID"]}, Iteration: #{d["Iteration"]["Name"]}"
d.read
fieldUpdates = { "Description" => "bad defect"}
d.update(fieldUpdates)
end