Module: Record

Defined in:
lib/ruby-optics/record/record.rb

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.included(base) ⇒ Object 



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# File 'lib/ruby-optics/record/record.rb', line 56

def self.included(base)
  base.define_singleton_method(:attribute) do |attribute_name, nullable: false, default: nil|
    @_record_attributes_defs ||= []
    @_record_attributes_defs << {
      attribute_name: attribute_name,
      nullable:       nullable,
      default:        default
    }

    base.attr_reader(attribute_name)
  end

  base.instance_variable_set(:"@_lenses", {})

  base.define_singleton_method(:lens) do |*attribute_names|
    head, *tail = attribute_names
    fst_lens = (@_lenses[head] ||= RecordLens.build(head))

    return fst_lens if tail.empty?

    [fst_lens, *tail].reduce { |result_lens, attribute_name|
      result_lens.compose_lens(RecordLens.build(attribute_name))
    }
  end
end

Instance Method Details

#==(another_record) ⇒ Object Also known as: eql? 



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# File 'lib/ruby-optics/record/record.rb', line 42

def ==(another_record)
  return false unless another_record.is_a?(self.class)

  another_record_attributes = another_record.send(:_current_attributes)

  _current_attributes == another_record_attributes
end

#copy_with(args_hash) ⇒ Object 



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# File 'lib/ruby-optics/record/record.rb', line 34

def copy_with(args_hash)
  self.class.new(
    _current_attributes.merge(
      args_hash.reject { |k, v| !_current_attributes.keys.include?(k) }
    )
  )
end

#hash ⇒ Object 



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# File 'lib/ruby-optics/record/record.rb', line 52

def hash
  [self.class, _current_attributes].hash
end

#initialize(args_hash) ⇒ Object 



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# File 'lib/ruby-optics/record/record.rb', line 6

def initialize(args_hash)
  defined_attributes = self.class.instance_variable_get(
    :"@_record_attributes_defs"
  ) || []
  
  defined_attributes.each do |defined_attribute_params|
    attribute_name = defined_attribute_params[:attribute_name]
    attribute_argument = args_hash[attribute_name]
    if attribute_argument.nil?
      if defined_attribute_params[:nullable]
        instance_variable_set(
          :"@#{attribute_name}",
          defined_attribute_params[:default]
        )
      else
        raise ArgumentError.new(
          "Attribute with name #{attribute_name} is not provided"
        )
      end
    else
      instance_variable_set(
        :"@#{attribute_name}",
        attribute_argument
      )
    end
  end
end