# File lib/autumn/datamapper_hacks.rb, line 86
  def self.setup(name, model, options={})
    class_name = options.fetch(:class_name, Extlib::Inflection.classify(name))
    if not options[:old_behavior] and not class_name.include?('::') then
      modules = model.to_s.split('::')
      modules.pop
      modules << class_name
      options[:class_name] = modules.join('::')
    end
    
    assert_kind_of 'name',    name,    Symbol
    assert_kind_of 'model',   model,   DataMapper::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__

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

    names        = [ opts[:child_model].demodulize, opts[:parent_model].name.demodulize ].sort
    model_name   = names.join.gsub("::", "")
    storage_name = Extlib::Inflection.tableize(Extlib::Inflection.pluralize(names[0]) + names[1])
    model_module = model.to_s.split('::')
    model_module.pop
    model_module = model_module.join('::')
    model_module = model_module.empty? ? Object : eval("::#{model_module}")
    
    opts[:near_relationship_name] = Extlib::Inflection.tableize(model_name).to_sym
    
    model.has(model.n, opts[:near_relationship_name], :old_behavior => true)

    relationship = DataMapper::Associations::RelationshipChain.new(opts)
    model.relationships(repository_name)[name] = relationship

    unless model_module.const_defined?(model_name)
      model = DataMapper::Model.new(storage_name)

      model.class_eval "def self.name; \#{model_name.inspect} end\ndef self.default_repository_name; \#{repository_name.inspect} end\ndef self.many_to_many; true end\n", __FILE__, __LINE__

      names.each do |n|
        model.belongs_to(Extlib::Inflection.underscore(n).gsub("/", "_").to_sym, :class_name => n)
      end

      model_module.const_set(model_name, model)
    end

    relationship
  end