Module: Tolliver::Utils::Enum::ClassMethods

Defined in:
lib/tolliver/utils/enum.rb

Instance Method Summary collapse

Instance Method Details

#enum_column(new_column, spec, options = {}) ⇒ Object

Add new enum column



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# File 'lib/tolliver/utils/enum.rb', line 22

def enum_column(new_column, spec, options = {})

  # Prepare internal structure
  if @enums.nil?
    @enums = {}
  end
  @enums[new_column] = {}

  # Fill out internal structure
  spec.each do |item|

    # Value check
    if item.is_a?(OpenStruct)
      item = item.to_h
    elsif item.is_a? Hash
      # OK
    else
      item = {value: item}
    end
    unless item[:value]
      raise "Enum definition cannot be empty."
    end

    # Identify special type
    item[:special_type] = :integer if item[:value].is_a?(Integer)

    # Retype to string
    item[:value] = item[:value].to_s

    # Label
    unless item[:label]
      item[:label] = I18n.t("activerecord.attributes.#{model_name.i18n_key}.#{new_column.to_s}_values.#{item[:special_type] ? item[:special_type].to_s + "_" : ""}#{item[:value]}")
    end

    # Other attributes
    if options[:attributes]
      options[:attributes].each do |attribute|
        singular_attribute_name = attribute.to_s.singularize
        plural_attribute_name = attribute.to_s.pluralize
        if item[singular_attribute_name.to_sym].nil?
          item[singular_attribute_name.to_sym] = I18n.t("activerecord.attributes.#{model_name.i18n_key}.#{new_column.to_s}_#{plural_attribute_name}.#{item[:special_type] ? item[:special_type].to_s + "_" : ""}#{item[:value]}")
        end
      end
    end

    # Store
    @enums[new_column][item[:value].to_s] = OpenStruct.new(item)
  end

  # Obj method
  define_method((new_column.to_s + "_obj").to_sym) do
    column = new_column

    # Get map Value => Object
    enums = self.class.enums[column]

    # Get possible special type
    special_type = enums.values.first.special_type if enums.first && enums.values.first.special_type

    # Get value and modify it according to special type
    value = self.send(column)
    value = value.to_i if special_type == :integer

    return self.class.enums[column][value.to_s]
  end

  # All method
  define_singleton_method(("available_" + new_column.to_s.pluralize).to_sym) do
    column = new_column
    return @enums[column].values
  end

  # All values method
  define_singleton_method(("available_" + new_column.to_s + "_values").to_sym) do
    column = new_column
    return @enums[column].values.map { |o| o.value.to_sym }
  end

  # Label method
  define_singleton_method((new_column.to_s + "_label").to_sym) do |value|
    column = new_column
    return @enums[column].values.select { |o| o.value.to_s == value.to_s }.map { |o| o.label }.first
  end

  # Default value
  if options[:default]
    before_validation do
      column = new_column
      default = options[:default]
      if self.send(column).nil?
        self.send(column.to_s + "=", default.to_s)
      end
    end
  end

end

#enums ⇒ Object

Get all defined enums



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# File 'lib/tolliver/utils/enum.rb', line 120

def enums
  @enums
end

#has_enum?(column) ⇒ Boolean

Check if given column is enum defined on this model

Returns:

  • (Boolean) 


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# File 'lib/tolliver/utils/enum.rb', line 125

def has_enum?(column)
  !@enums.nil? && !@enums[column].nil?
end