Class: Yarrow::Schema::Entity

Inherits:
Object
  • Object
show all
Defined in:
lib/yarrow/schema.rb

Overview

Entity with comparison by reference equality. Generates attribute helpers for a declared set of props. Used to replace Hashie::Mash without dragging in a whole new library.

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(config) ⇒ Entity

Returns a new instance of Entity.



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# File 'lib/yarrow/schema.rb', line 107

def initialize(config)
  dictionary.each_key do |name|
    raise "missing declared attribute #{name}" unless dictionary.key?(name)
  end

  config.each_pair do |key, value|
    raise "#{key} not a declared attribute" unless dictionary.key?(key)

    defined_type = dictionary[key]

    unless value.is_a?(defined_type)
      raise "#{key} accepts #{defined_type} but #{value.class} given"
    end

    instance_variable_set("@#{key}", value)
  end
end

Class Method Details

.attribute(name, value_type) ⇒ Object 



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# File 'lib/yarrow/schema.rb', line 90

def attribute(name, value_type)
  # define_method("map_#{name}".to_sym) do |input|
  #   value_type.coerce(input)
  # end
  dictionary[name] = value_type
  attr_reader(name)
end

.dictionary ⇒ Object 



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# File 'lib/yarrow/schema.rb', line 98

def dictionary
  @dictionary ||= Hash.new
end

Instance Method Details

#dictionary ⇒ Object 



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# File 'lib/yarrow/schema.rb', line 103

def dictionary
  self.class.dictionary
end