# File lib/dm-core/associations/one_to_many.rb, line 9
      def self.setup(name, model, options = {})
        assert_kind_of 'name',    name,    Symbol
        assert_kind_of 'model',   model,   Model
        assert_kind_of 'options', options, Hash

        repository_name = model.repository.name

        model.class_eval "def \#{name}(query = {})\n\#{name}_association.all(query)\nend\n\ndef \#{name}=(children)\n\#{name}_association.replace(children)\nend\n\nprivate\n\ndef \#{name}_association\n@\#{name}_association ||= begin\nunless relationship = model.relationships(\#{repository_name.inspect})[\#{name.inspect}]\nraise ArgumentError, \"Relationship \#{name.inspect} does not exist in \\\#{model}\"\nend\nassociation = Proxy.new(relationship, self)\nparent_associations << association\nassociation\nend\nend\n", __FILE__, __LINE__

        model.relationships(repository_name)[name] = if options.has_key?(:through)
          opts = options.dup

          if opts.key?(:class_name) && !opts.key?(:child_key)
            warn("You have specified \#{model.base_model.name}.has(\#{name.inspect}) with :class_name => \#{opts[:class_name].inspect}. You probably also want to specify the :child_key option.\n".margin)
          end

          opts[:child_model]            ||= opts.delete(:class_name)  || Extlib::Inflection.classify(name)
          opts[:parent_model]             =   model
          opts[:repository_name]          =   repository_name
          opts[:near_relationship_name]   =   opts.delete(:through)
          opts[:remote_relationship_name] ||= opts.delete(:remote_name) || name
          opts[:parent_key]               =   opts[:parent_key]
          opts[:child_key]                =   opts[:child_key]

          RelationshipChain.new( opts )
        else
          Relationship.new(
            name,
            repository_name,
            options.fetch(:class_name, Extlib::Inflection.classify(name)),
            model,
            options
          )
        end
      end