Module: ArrayEnum

Defined in:
lib/array_enum.rb,
lib/array_enum/version.rb

Defined Under Namespace

Classes: Railtie, SubsetValidator

Constant Summary collapse

VERSION = 
'1.6.0'

Instance Method Summary collapse

Instance Method Details

#array_enum(definitions) ⇒ Object 



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# File 'lib/array_enum.rb', line 11

def array_enum(definitions)
  definitions.each do |attr_name, mapping|
    attr_symbol = attr_name.to_sym
    mapping_hash = ActiveSupport::HashWithIndifferentAccess.new(mapping)

    define_singleton_method(attr_name.to_s.pluralize) do
      mapping_hash
    end

    {
      "with_#{attr_name}" => '@>',
      "only_with_#{attr_name}" => '=',
      "with_any_of_#{attr_name}" => '&&'
    }.each do |method_name, comparison_operator|
      define_singleton_method(method_name.to_sym) do |values|
        db_values = Array(values).map do |value|
          mapping_hash[value] || raise(ArgumentError, format(MISSING_VALUE_MESSAGE, value: value, attr: attr_name))
        end
        where("#{table_name}.#{attr_name} #{comparison_operator} ARRAY[:db_values]::integer[]", db_values: db_values)
      end
    end

    define_method(attr_symbol) do
      Array(self[attr_symbol]).map { |value| mapping_hash.key(value) }
    end

    define_method("#{attr_name}=".to_sym) do |values|
      self[attr_symbol] = Array(values).map do |value|
        mapping_hash[value] || raise(ArgumentError, format(MISSING_VALUE_MESSAGE, value: value, attr: attr_name))
      end.uniq
    end
  end
end