Contents

# Adds the `::field` method to object and input types.
module Taro::Types::Shared::Fields
  # Field types are set using class name Strings. The respective type classes
  # are evaluated lazily to allow for circular or recursive type references,
  # and to avoid unnecessary autoloading of all types in dev/test envs.
  def field(name, **kwargs)
    defined_at = kwargs[:defined_at] || caller_locations(1..1)[0]
    validate_name(name, defined_at:)
    validate_no_override(name, defined_at:)
    validate_options(name, defined_at:, **kwargs)

    field_defs[name] = { name:, defined_at:, **kwargs }
  end

  def fields
    @fields ||= evaluate_field_defs
  end

  private

  def validate_name(name, defined_at:)
    name.is_a?(Symbol) ||
      raise(Taro::ArgumentError, "field name must be a Symbol, got #{name.class} at #{defined_at}")
  end

  def validate_options(name, defined_at:, **kwargs)
    [true, false].include?(kwargs[:null]) ||
      raise(Taro::ArgumentError, "null has to be specified as true or false for field #{name} at #{defined_at}")

    c_keys = Taro::Types::Coercion.keys
    (type_keys = (kwargs.keys & c_keys)).size == 1 ||
      raise(Taro::ArgumentError, "exactly one of #{c_keys.join(', ')} must be given for field #{name} at #{defined_at}")

    kwargs[type_keys.first].class == String ||
      raise(Taro::ArgumentError, "#{type_keys.first} must be a String for field #{name} at #{defined_at}")
  end

  def validate_no_override(name, defined_at:)
    prev = field_defs[name]
    prev && raise(Taro::ArgumentError, "field #{name} at #{defined_at} previously defined at #{prev[:defined_at]}")
  end

  def field_defs
    @field_defs ||= {}
  end

  def evaluate_field_defs
    field_defs.transform_values do |field_def|
      type = Taro::Types::Coercion.call(field_def)
      Taro::Types::Field.new(**field_def.except(*Taro::Types::Coercion.keys), type:)
    end
  end

  def inherited(subclass)
    subclass.instance_variable_set(:@field_defs, field_defs.dup)
    super
  end
end

Version data entries

3 entries across 3 versions & 1 rubygems

Version	Path
taro-1.4.0	lib/taro/types/shared/fields.rb
taro-1.3.0	lib/taro/types/shared/fields.rb
taro-1.2.0	lib/taro/types/shared/fields.rb