Module: NoSE::DSL

Defined in:
lib/nose/util.rb

Overview

Helper functions for building DSLs

Class Method Summary collapse

Class Method Details

.mixin_fields(entities, cls) ⇒ void

This method returns an undefined value.

Add methods to the class which can be used to access entities and fields



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# File 'lib/nose/util.rb', line 234

def mixin_fields(entities, cls)
  entities.each do |entity_name, entity|
    # Add fake entity object for the DSL
    fake = Object.new

    # Add a method named by the entity to allow field creation
    cls.send :define_method, entity_name.to_sym, (proc do
      metaclass = class << fake; self; end

      # Allow fields to be defined using [] access
      metaclass.send :define_method, :[] do |field_name|
        if field_name == '*'
          entity.fields.values
        else
          entity.fields[field_name] || entity.foreign_keys[field_name]
        end
      end

      # Define methods named for fields so things like 'user.id' work
      entity.fields.merge(entity.foreign_keys).each do |field_name, field|
        metaclass.send :define_method, field_name.to_sym, -> { field }
      end

      fake
    end)
  end
end