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# File 'lib/active_item/composed_of.rb', line 140
def composed_of(part_id, options = {})
class_name = options[:class_name] || part_id.to_s.camelize
mapping = options[:mapping] || {}
allow_nil = options.fetch(:allow_nil, true)
constructor = options.fetch(:constructor, :new)
converter = options[:converter]
compositions[part_id] = { class_name: class_name, mapping: mapping, allow_nil: allow_nil,
constructor: constructor, converter: converter }
define_method(part_id) do
ivar = "@_composed_#{part_id}"
return instance_variable_get(ivar) if instance_variable_defined?(ivar)
vo_class = Object.const_get(class_name)
values = mapping.map { |model_attr, _vo_attr| send(model_attr) }
if allow_nil && values.all? { |v| v.nil? || (v.respond_to?(:empty?) && v.empty?) }
instance_variable_set(ivar, nil)
return nil
end
vo = if constructor.is_a?(Proc)
constructor.call(*values)
else
kwargs = {}
mapping.each { |model_attr, vo_attr| kwargs[vo_attr] = send(model_attr) }
vo_class.send(constructor, **kwargs)
end
instance_variable_set(ivar, vo)
end
define_method("#{part_id}=") do |value|
ivar = "@_composed_#{part_id}"
if value.nil?
mapping.each_key { |model_attr| send("#{model_attr}=", nil) }
instance_variable_set(ivar, nil)
elsif value.is_a?(Object.const_get(class_name))
mapping.each { |model_attr, vo_attr| send("#{model_attr}=", value.send(vo_attr)) }
instance_variable_set(ivar, value)
elsif converter
converted = converter.is_a?(Proc) ? converter.call(value) : Object.const_get(class_name).send(converter, value)
send("#{part_id}=", converted)
elsif value.is_a?(Hash)
vo = Object.const_get(class_name).new(**value.transform_keys(&:to_sym))
send("#{part_id}=", vo)
else
raise ArgumentError, "Cannot assign #{value.class} to #{part_id}. Expected #{class_name}, Hash, or nil."
end
end
end
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