Module: DataMapper::Maker

Defined in:
lib/dm-maker.rb,
lib/dm-maker/version.rb

Constant Summary collapse

REL_TYPES = 
{
  :to_one => [DataMapper::Associations::ManyToOne::Relationship,
      DataMapper::Associations::OneToOne::Relationship],
  :to_many => [DataMapper::Associations::ManyToMany::Relationship,
      DataMapper::Associations::OneToMany::Relationship]
}
VERSION = 
"1.2.0"

Class Method Summary collapse

Class Method Details

.create_instance(klass, data, cache = {}) ⇒ Object

TODO: document $id / $ref



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# File 'lib/dm-maker.rb', line 39

def self.create_instance(klass, data, cache={}) # TODO: document $id / $ref
  if ref = data.delete("$ref")
    raise ArgumentError if data.length > 0
    return cache[ref]
  end
  id = data.delete("$id")

  data.each { |key, value|
    rel_name = key.to_sym
    if rel = klass.relationships[rel_name]
      if REL_TYPES[:to_many].include? rel.class
        assoc_class = klass.new. # XXX: hacky
            send(rel_name).relationship.child_model
        value = value.map { |d|
          if custom_class = d.delete("$class") # TODO: document and test
            assoc_class = custom_class.constantize
          end
          create_instance(assoc_class, d, cache)
        }
      elsif REL_TYPES[:to_one].include? rel.class
        if custom_class = value.delete("$class") # TODO: document and test
          assoc_class = custom_class.constantize
        else
          assoc_class = (rel.child_model == klass or klass < rel.child_model) ?
              rel.parent_model : rel.child_model
        end
        value = create_instance(assoc_class, value, cache)
      end
    end
    data[key] = value # XXX: dangerous while iterating over that same hash!?
  }

  instance = klass.new(data)

  cache[id] = instance if id
  return instance
end

.load_yaml(yaml) ⇒ Object 



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# File 'lib/dm-maker.rb', line 77

def self.load_yaml(yaml)
  yaml = ERB.new(yaml).result # TODO: document
  # hack to retain order in Ruby 1.8
  # TODO: document expectations/constraints (only required for $id / $ref)
  yaml.split("\n\n").each_with_object(ActiveSupport::OrderedHash.new) { |yml, hsh|
    hsh.merge! YAML.load(yml)
  }
end

.make(data) ⇒ Object

returns a hash of instances by class if any errors occur, the respective instances are stored in a special “_errors” member



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# File 'lib/dm-maker.rb', line 24

def self.make(data)
  data = load_yaml(data) if data.class == String

  cache = {}
  res = { "_errors" => [] }
  return data.each_with_object(res) do |(class_name, instances), hsh|
    klass = class_name.constantize
    hsh[class_name] = instances.map { |instance_data|
      instance = create_instance(klass, instance_data, cache)
      hsh["_errors"] << instance unless instance.save
      instance
    }
  end
end