dkubb

include 'dm-is-list'

class Node
  include DataMapper::Resource

  property :id, Serial
  # other properties...

  has n, :parts
end

dkubb

header = nil

FasterCSV.foreach(FILE) do |row|
  row.map! { |v| v.strip!; v == 'NULL' || v.blank? ? nil : v }

  unless header
    header = row.freeze
    next
  end

dkubb

# As an exercise, come up with a ruby-way to specify 
# a set of search conditions for this SQL:

# simple or
# WHERE name = 'Dan' OR name = 'Paul'

# nested or, plus duplicating field names
# WHERE name = 'Paul' AND ( age < 18 OR age > 21 )

# not ( and don't say != )

dkubb

# limit/offset using Enumerable#slice

collection[0, 20]  # LIMIT 0, 20
collection[0..20]  # LIMIT 0, 20


# ordering using Enumerable#sort_by (will not require ParseTree)

collection.sort_by { |o| o.name }               # ORDER BY name
collection.sort_by { |o| -o.name }              # ORDER BY name DESC

dkubb

This repository has moved to http://github.com/dkubb/dm-ambition

dkubb

require 'pp'
require 'rubygems'

gem 'dm-core', '0.10.0'      # http://github.com/datamapper/dm-core (next branch)
require 'dm-core'

gem 'dm-ambition', '0.10.0'  # http://github.com/dkubb/dm-ambition (master branch)
require 'dm-ambition'

DataMapper::Logger.new($stdout, :debug)

dkubb

NOTE: run all the commands prefixed with "$" from the command-line.

0) Make sure sake is installed:

  $ sudo gem install sake

1) Make sure you've applied this patch to sake:

     http://err.lighthouseapp.com/attachments/50325/sake_rake_0.8.2.patch

dkubb

# Here is a list of all the dm-core runtime deps.

$ gem dep dm-core --remote

Gem dm-core-0.9.10
  data_objects (~> 0.9.11, runtime)
  extlib (~> 0.9.10, runtime)
  addressable (~> 2.0.1, runtime)

dkubb

[dankubb@laptop.autopilot] extlib (next) % rake spec --trace
(in /Users/dankubb/Programming/ruby/open-source/dm/extlib)
rake aborted!
unknown marshal code: 1
kernel/compiler/compile.rb:211:in `single_load {}'
kernel/compiler/compile.rb:142:in `compile_feature'
kernel/compiler/compile.rb:210:in `single_load'
kernel/compiler/compile.rb:131:in `unified_load {}'
kernel/bootstrap/array.rb:49:in `each'
kernel/compiler/compile.rb:95:in `unified_load'

dkubb

rake spec results:

    MySQL
    102 examples, 1 failure, 1 pending
    
    Postgres
    114 examples, 10 failures, 1 pending
    
    SQLite3
    SQlite3 -- database locked