Class: Logical::Naf::Unpickler

Inherits:
Object
  • Object
show all
Includes:
Af::Application::Component
Defined in:
app/models/logical/naf/unpickler.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(preserves, preservables, input_version) ⇒ Unpickler

Returns a new instance of Unpickler.



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# File 'app/models/logical/naf/unpickler.rb', line 12

def initialize(preserves, preservables, input_version)
  @preserves = preserves
  @preservables = preservables
  @input_version = input_version
  @references = {}
  @context = {}
end

Instance Attribute Details

#context ⇒ Object (readonly)

Returns the value of attribute context.



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# File 'app/models/logical/naf/unpickler.rb', line 6

def context
  @context
end

#input_version ⇒ Object (readonly)

Returns the value of attribute input_version.



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# File 'app/models/logical/naf/unpickler.rb', line 6

def input_version
  @input_version
end

#preservables ⇒ Object (readonly)

Returns the value of attribute preservables.



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# File 'app/models/logical/naf/unpickler.rb', line 6

def preservables
  @preservables
end

#preserves ⇒ Object (readonly)

Returns the value of attribute preserves.



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# File 'app/models/logical/naf/unpickler.rb', line 6

def preserves
  @preserves
end

#references ⇒ Object (readonly)

Returns the value of attribute references.



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# File 'app/models/logical/naf/unpickler.rb', line 6

def references
  @references
end

Instance Method Details

#cache_all_models(model) ⇒ Object 



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# File 'app/models/logical/naf/unpickler.rb', line 20

def cache_all_models(model)
  references.merge!(Hash[model.all.map do |m|
                           logger.detail "caching: #{m.inspect}"
                           [{ association_model_name: model.name, association_value: m.id }, m]
                         end
                        ])
end

#generic_unpickle(model, preserve, id_method_name = :id) ⇒ Object 



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# File 'app/models/logical/naf/unpickler.rb', line 32

def generic_unpickle(model, preserve, id_method_name = :id)
  if references[{ association_model_name: model.name, association_value: preserve[id_method_name.to_s] }]
    return {}
  end

  attributes = {}

  reference_methods = []
  preserve.each do |method_name, value|
    id_method = method_name.to_sym
    unless id_method_name == id_method
      if value.is_a?(Hash)
        # this is a reference
        reference_instance = retrieve_reference(value)
        if reference_instance.nil?
          logger.error value.inspect
          logger.error { references.map{|r| r.inspect}.join("\n") }
          logger.error { references.map{ |r| r.inspect }.join("\n") }
          raise "couldn't find reference for #{value.inspect} in #{preserve.inspect}"
        end
        attributes[method_name.to_sym] = reference_instance.id
      else
        attributes[method_name.to_sym] = value
      end
    end
  end

  instance = model.new
  attributes.each do |method, value|
    instance.send("#{method}=".to_sym, value)
  end
  instance.save!
  logger.info "created #{instance.inspect}"

  return { { association_model_name: model.name,
             association_value: preserve[id_method_name.to_s] } => instance }
end

#reconstitute ⇒ Object 



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# File 'app/models/logical/naf/unpickler.rb', line 70

def reconstitute
  preservables.each do |model|
    if model.respond_to?(:pre_unpickle)
      model.pre_unpickle(self)
    else
      cache_all_models(model)
    end
  end

  preservables.each do |model|
    model_preserves = preserves[model.name]
    if model_preserves
      model_preserves.each do |model_preserve|
        if model.respond_to?(:unpickle)
          additional_references = model.unpickle(model_preserve, self)
        else
          additional_references = generic_unpickle(model, model_preserve)
        end
        references.merge!(additional_references)
      end
    end
  end

  preservables.each do |model|
    model.post_unpickle(self) if model.respond_to?(:post_unpickle)
  end
end

#retrieve_reference(reference) ⇒ Object 



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# File 'app/models/logical/naf/unpickler.rb', line 28

def retrieve_reference(reference)
  references[reference.symbolize_keys]
end