Module: JSONAPIonify::InheritedAttributes

Defined in:
lib/jsonapionify/inherited_attributes.rb

Instance Method Summary collapse

Instance Method Details

#inherited_array_attribute(*attrs, instance_reader: true, instance_writer: true, instance_accessor: true) ⇒ Object 



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# File 'lib/jsonapionify/inherited_attributes.rb', line 65

def inherited_array_attribute(*attrs, instance_reader: true, instance_writer: true, instance_accessor: true)
  instance_reader, instance_writer = false, false unless instance_accessor
  attrs.each do |attr|
    ivar   = :"@#{attr}"
    setter = :"#{attr}="
    getter = :"#{attr}"

    # Define First Variable
    instance_variable_set(ivar, Array.new)

    # Define Setter
    define_singleton_method setter do |value|
      instance_variable_get(ivar).tap(&:clear).concat(value)
    end

    # Define Getter
    define_singleton_method getter do
      instance_variable_get(ivar)
    end

    # Define Instance Getter
    define_method getter do
      if instance_variable_defined?(ivar)
        instance_variable_get(ivar)
      else
        instance_variable_set(
          ivar,
          self.class.instance_variable_get(ivar).dup
        )
      end
    end if instance_reader

    # Define Instance Setter
    define_method setter do |value|
      instance_variable_get(ivar).tap(&:clear).concat(value)
    end if instance_writer

    # Define Inheritor
    mod = Module.new do
      define_method :inherited do |subclass|
        super(subclass)

        # Set subclass variable
        subclass.instance_variable_set(ivar, Array.new)
        parent_var   = instance_variable_get(ivar)
        subclass_var = subclass.instance_variable_get(ivar)

        # Merge changes from parent
        subclass_var.concat(parent_var)

        # Observe
        observer = EnumerableObserver.observe(parent_var)
        observer.added { |items| subclass_var.concat items }
        observer.removed { |items| items.each { |item| subclass_var.delete item } }
      end
    end
    extend mod
  end
end

#inherited_hash_attribute(*attrs, instance_reader: true, instance_writer: true, instance_accessor: true) ⇒ Object 



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# File 'lib/jsonapionify/inherited_attributes.rb', line 6

def inherited_hash_attribute(*attrs, instance_reader: true, instance_writer: true, instance_accessor: true)
  instance_reader, instance_writer = false, false unless instance_accessor
  attrs.each do |attr|
    ivar   = :"@#{attr}"
    setter = :"#{attr}="
    getter = :"#{attr}"

    # Define First Variable
    instance_variable_set(ivar, Hash.new)

    # Define Setter
    define_singleton_method setter do |value|
      instance_variable_get(ivar).tap(&:clear).merge! value
    end

    # Define Getter
    define_singleton_method getter do
      instance_variable_get(ivar)
    end

    # Define Instance Getter
    define_method getter do
      if instance_variable_defined?(ivar)
        instance_variable_get(ivar)
      else
        instance_variable_set(
          ivar,
          self.class.instance_variable_get(ivar).dup
        )
      end
    end if instance_reader

    # Define Instance Setter
    define_method setter do |value|
      instance_variable_get(ivar).tap(&:clear).merge! value
    end if instance_writer

    # Define Inheritor
    extend (Module.new do
      define_method :inherited do |subclass|
        super(subclass)

        # Set subclass variable
        subclass.instance_variable_set(ivar, Hash.new)
        parent_var   = instance_variable_get(ivar)
        subclass_var = subclass.instance_variable_get(ivar)

        # Merge changes from parent
        subclass_var.deep_merge!(parent_var)

        # Observe
        observer = EnumerableObserver.observe(parent_var)
        observer.added { |items| subclass_var.deep_merge! items.to_h }
        observer.removed { |items| subclass_var.delete_if { |k, v| items.to_h[k] == v } }
      end
    end)
  end
end