Collection#concat doesn't update query for lazy_loading

Question

Example program which illustrates the issue (tested with ruby 1.8.6 (2008-08-11) [universal-darwin9.0]):

require "rubygems"
require "dm-core"
require "dm-serializer"

class Item
  include DataMapper::Resource

  property :id,               Serial
  property :title,            String
  property :kind,             Integer
  property :content,          Text  

end

DataMapper::Logger.new(STDOUT, :debug)
DataMapper.setup(:default, "sqlite3://#{Dir.pwd}/test.db")
DataMapper.auto_migrate!

0.upto(100) do |i| 
  item = Item.create( :title => "item#{i}" , :content => "bla blab la " , :kind => ( rand() > 0.5 ? 1 : 2 ) )
end

as = Item.all( :kind => 1 )
bs = Item.all( :kind => 2 )

merged = as.concat( bs )

puts "Merged: #{merged.size}" # => 101

puts "Without json: #{merged.map { |item| item }.size}" # => 101
puts "With json: #{merged.map { |item| item.to_json }.size} (should be 101)" # => ~50 

Edit: Updated example, it has the same error without the "has n" so now it's more compact and to the point.

Created by Robert Sköld - 2009-08-24 17:55:09 UTC

Original Lighthouse ticket: http://datamapper.lighthouseapp.com/projects/20609/tickets/1020

该提问来源于开源项目：datamapper/dm-core

Answer 1

I’m not entirely sure, but it seems this is fixed in the current next branch?

by Robert Sköld