dynamic_attributes_dsl

🛠️ Dynamic Attributes DSL with method_missing

Leverage method_missing to build a concise DSL for dynamically defined attributes, avoiding boilerplate getters and setters. Pair it with respond_to_missing? to maintain compatibility with reflection and tools like Rails’ form builders. This approach is ideal for classes where attributes are defined at runtime from external schemas or configuration.

class DynamicModel
  def initialize(attributes = {})
    @attributes = attributes
  end

  def method_missing(name, *args, &block)
    attr_name = name.to_s.chomp("=")

    if name.to_s.end_with?('=')
      @attributes[attr_name] = args.first
    elsif @attributes.key?(name.to_s)
      @attributes[name.to_s]
    else
      super
    end
  end

  def respond_to_missing?(name, include_private = false)
    attr_name = name.to_s.chomp("=")
    @attributes.key?(attr_name) || super
  end
end

user = DynamicModel.new('first_name' => 'Alice')
user.last_name = 'Smith'      # sets @attributes['last_name']
puts user.first_name         # => "Alice"
puts user.respond_to?(:age)  # => false