#!/usr/bin/env ruby
 
ENV['LOG_NAME'] ||= 'example'
require 'environment'
 
# Define a fixtures helper method to load up our test data.
def fixtures(name)
  entry = YAML::load_file(File.dirname(__FILE__) + "/spec/fixtures/#{name}.yaml")
  klass = begin
    Kernel::const_get(Inflector.classify(Inflector.singularize(name)))
  rescue
    nil
  end
 
  unless klass.nil?
    database.logger.debug { "AUTOMIGRATE: #{klass}" }
    klass.auto_migrate!
 
    (entry.kind_of?(Array) ? entry : [entry]).each do |hash|
      if hash['type']
        Object::const_get(hash['type'])::create(hash)
      else
        klass::create(hash)
      end
    end
  else
    table = database.table(name.to_s)
    table.create! true
    table.activate_associations!
 
    #pp database.schema
 
    (entry.kind_of?(Array) ? entry : [entry]).each do |hash|
      table.insert(hash)
    end
  end
end
 
 
# Pre-fill the database so non-destructive tests don't need to reload fixtures.
Dir[File.dirname(__FILE__) + "/spec/fixtures/*.yaml"].each do |path|
  fixtures(File::basename(path).sub(/\.yaml$/, ''))
end
 
require 'irb'
 
# database { IRB::start }
IRB::start
 
if false
 
# Simple example to setup a database:
DataMapper::Database.setup({
  :adapter => 'mysql',
  :database => 'data_mapper_1',
  :username => 'root'
})
 
class Animal #:nodoc:
  include DataMapper::Persistence
  
  set_table_name 'animals' # Just as an example. Same inflector as Rails,
    # so this really isn't necessary.
    
  property :name, :string
  property :notes, :string, :lazy => true
  
  has_and_belongs_to_many :exhibits
end
 
class Exhibit #:nodoc:
  include DataMapper::Persistence
 
  property :name, :string
  belongs_to :zoo
end
 
class Zoo #:nodoc:
  include DataMapper::Persistence
 
  property :name, :string
  has_many :exhibits
end
 
class Person #:nodoc:
  include DataMapper::Persistence
 
  property :name, :string
  property :age, :integer
  property :occupation, :string
  property :notes, :text, :lazy => true
 
  # Generates Person::Address class:
  embed :address do
    property :street, :string
    property :city, :string
    property :state, :string, :size => 2
    property :postal_code, :string
  end
end
 
# Compatible with ActiveRecord finder syntax:
Zoo.find(1)
Zoo.find(:first, :conditions => ['name = ?', 'Galveston'])
Zoo.find(:all)
 
# These are options as well:
Zoo[1]
Zoo.first(:name => 'Galveston')
Zoo.all
 
# Or even this as an alias to ::first:
Zoo[:name => 'Galveston']
 
# EmbeddedValues are just nice sugar to partition
# denormalized data.
Person.first.address.city
 
# Remove all data in a table...  
Person.truncate!
  
# Create a new object...
Person::create(:name => 'Sam', :age => 30, :occupation => 'Software Monkey')
 
# Saving only updates the values that have changed,
# and is skipped entirely if the object is not dirty.
dumbo = Animal.first(:name => 'Elephant')
dumbo.notes = 'He can fly!'
dumbo.save # returns true
dumbo.save # The object is no longer dirty, so returns false
  
# DataMapper associations are loaded as sets.
# Here's the code:
Zoo.all.each { |zoo| zoo.exhibits.entries }
# The important bit to understand about the above is that
# every Zoo that was loaded by Zoo.all has a reference to
# every other Zoo it was loaded with through Zoo#loaded_set.
# This is then used to load all other instances in the set
# when the association of one instance is accessed. So while
# it looks like we'd run into the dreaded 1+N query problem
# with the above, we actually avoid it entirely. The above
# code will only execute two queries. The first to find all
# zoos, the second to load all exhibits with zoo_id's that
# are a part of the set of loaded zoos.
 
 
# Objects within the same session are uniqued, so this is both
# faster, and fulfills obvious expectations.
database do
  Zoo.first == Zoo.first
end
 
# DataMapper find_by_sql equivilent
database.query("SELECT * FROM zoos")
 
end