Module: ModularStateMachine::ClassMethods

Defined in:
lib/modular_state_machine.rb

Instance Method Summary collapse

Instance Method Details

#build_boolean_instance_methods(attribute, options = []) ⇒ Object

Builds out the boolean methods for constants defined in mod_machine_for. Arguments must follow the same format as the aforementioned method.



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# File 'lib/modular_state_machine.rb', line 42

def build_boolean_instance_methods(attribute, options = [])
  options.each do |const|
    puts const.class

    class_eval <<-RUBY
      def #{const.to_s.split("::").last.tableize.singularize}?
        self.#{attribute.downcase} == #{attribute}::#{const.to_s.demodulize}
      end
    RUBY
  end
end

#build_mutable_instance_methods(attribute, options = []) ⇒ Object

Builds out mutable update methods for constants defined in state_machine_for. Arguments must follow the same format as the aforementioned method.

example object.case_study! #=> UPDATE "objects" SET "category" = 2 WHERE "objects"."id" = 1; object.case_study? #=> true



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# File 'lib/modular_state_machine.rb', line 64

def build_mutable_instance_methods(attribute, options = [])
  column = ":" + attribute.to_s.downcase
  options.each do |const|
    class_eval <<-RUBY
      def #{const.to_s.demodulize.tableize.singularize}!
        update_attribute #{column}, #{attribute}::#{const.to_s.demodulize}
      end
    RUBY
  end
end

#state_machine_for(attribute, options = []) ⇒ Object

Builds a module with constants assigned to the index passed in the options array. Be sure to pass all arguments as you would write them manually. In other words attribute and any constants passed in options should be classified case (e.g. ThisModule).

attribute = Name of the class attribute that should be the module"s name. MUST be a attribute of the class. options = Array of constants identified with attribute

example state_machine_for("Category", ["PeerReviewed", "NonPeerReviewed", "CaseStudy"])



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# File 'lib/modular_state_machine.rb', line 27

def state_machine_for(attribute, options = [])
  constants = ""
  options.each_with_index do |constant, index|
    constants << "#{constant} = #{index}; "
  end
  mod = %(module #{attribute}; #{constants} def self.names; #{options.map(&:to_sym)}; end; end)
  module_eval(mod)
  build_boolean_instance_methods(attribute, options)
  build_mutable_instance_methods(attribute, options)
end