faker-ruby/faker · error · ArgumentError

unknown return type: #{@as_type}

Error message

unknown return type: #{@as_type}

What it means

Error "unknown return type: #{@as_type}" thrown in faker-ruby/faker.

Source

Thrown at lib/helpers/positional_generator.rb:349

      end

      result.sort_by do |component_position, _, _|
        component_position
      end
    end

    ##
    # @param values [Array<Object>]
    # @return [String] if +@as_type+ is +:string+
    # @raise [ArgumentError] if +@as_type+ is unsupported
    def convert(values)
      case @as_type
      when :string
        values.inject('') do |acc, (_, _, v)|
          "#{acc}#{v}"
        end
      else
        raise ArgumentError, "unknown return type: #{@as_type}"
      end
    end

    class Group
      def initialize(as_type, block)
        @as_type = as_type
        @block = block
      end

      def generate(_)
        builder = Builder.new(@as_type)
        @block.call(builder)
        builder.build
      end
    end

    class Oneof
      def initialize(builder, block)

View on GitHub (pinned to cca4184947)

When it happens

Trigger: Thrown at lib/helpers/positional_generator.rb:349 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of faker-ruby/faker@cca4184947 (2026-08-21). Data as JSON: /api/errors/429faf10f40651b1. Report an issue: GitHub.