Module: Jason::Relation::ClassMethods

Defined in:
lib/jason/relation.rb

Instance Method Summary collapse

Instance Method Details

#belongs_to(*args) ⇒ Object 



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# File 'lib/jason/relation.rb', line 82

def belongs_to(*args)
  relation_name = args.shift.to_s
  options       = args.empty? ? {} : args.shift

  class_name    = options.fetch(:class, relation_name).capitalize

  reflections   << Reflection::Base.new(:name => relation_name,
                                        :class_name => class_name,
                                        :type => "belongs_to")

  ivar_name = "#{relation_name}_id".to_sym
  attribute ivar_name, String

  method_definition_setter = <<-RUBY
    def #{relation_name}=(obj)
      self.send("#{ivar_name}=", obj.id)  
      self.instance_variable_set("@#{relation_name}",obj)
      self.reload_attributes
    end

  RUBY

  method_definition_getter = <<-RUBY
    def #{relation_name}
      relation_obj = self.instance_variable_get("@#{relation_name}")
      finder = ->() do 
        klass = Module.const_get("#{class_name}".to_sym)
        relation_obj = klass.find(self.send("#{ivar_name}"))
        self.instance_variable_set("@#{relation_name}", relation_obj)
        return relation_obj
      end
      relation_obj ||= finder.call
    end
  RUBY

  class_eval method_definition_setter, "relation.rb", 63
  class_eval method_definition_getter, "relation.rb", 72
end

#has_many(*args) ⇒ Object 



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# File 'lib/jason/relation.rb', line 26

def has_many(*args)
  relation_name = args.shift.to_s
  options = args.empty? ? {} : args.shift

  class_name = options.fetch(:class, relation_name.downcase.singularize).capitalize

  reflections << Reflection::Base.new(:name => relation_name, 
                                      :class_name => class_name,
                                      :type => "has_many")

  ivar_name = "#{relation_name}_ids".to_sym

  attribute ivar_name, String

  method_definition_getter = <<-RUBY

    def #{relation_name}
      # find all children in *.json if included.
      # Otherwise return empty array.
      relation_objects = self.instance_variable_get("@#{relation_name}")
      finder = ->() do
        objects = []
        object_ids = self.send("#{ivar_name}")
        unless object_ids.nil? or object_ids.empty?
          object_ids.split(Jason::has_many_separator).each do |object_id|
            begin
              klass = Module.const_get("#{class_name}".to_sym)
              objects << klass.find(object_id)
            rescue 
              next
            end
          end
        end
        self.instance_variable_set("@#{relation_name}", objects)
        return objects
      end
      relation_objects ||= finder.call
    end

  RUBY

  method_definition_setter = <<-RUBY

    def #{relation_name}=(objects)
      self.send("#{ivar_name}=", objects.map(&:id).join(Jason::has_many_separator))  
      self.instance_variable_set("@#{relation_name}",objects)
      self.reload_attributes
    end

  RUBY

  class_eval method_definition_getter
  class_eval method_definition_setter

end

#reflect_on_relation(relation_name) ⇒ Object 



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# File 'lib/jason/relation.rb', line 22

def reflect_on_relation(relation_name)
  reflections.detect{|reflection| reflection.name.eql?(relation_name.to_s)}
end

#reflections ⇒ Object 



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# File 'lib/jason/relation.rb', line 18

def reflections
  @reflections ||= []   
end