Rails 路由 - 如何将范围参数添加到 url_for 助手?

Iva*_*nko 4 ruby routing ruby-on-rails rails-routing

我有资源生物和视图和添加新生物的链接是:

= link_to "Add new bio", [:new, :admin, :bio]
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如果我把资源 :bio 放在这样的范围内:

namespace :admin do    
  scope "/:bio_type", :defaults => {:bio_type => "company"} do
    resources :bios
  end
end
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这不起作用

= link_to "Add new bio", [:new, :admin, :bio, { bio_type: params[:bio_type] }]
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我的问题是如何将范围参数添加到 url_for 助手?默认情况下,rails 可以执行此操作吗?

ps new_admin_bio_path({bio_type: params[:bio_type]}) 工作正常,但只是好奇

cut*_*ion 6

我相信你不能用数组参数来做到这一点link_to。你必须使用polymorphic_pathnew_admin_bio_path({bio_type: params[:bio_type]})

原因是link_to调用url_forwith [:new, :admin, :bio, { bio_type: params[:bio_type] }],调用polymorphic_path这些参数。

检查url_forpolymorphic_url的源代码。请注意,这polymorphic_url需要 2 个参数 -record_or_hash_or_arrayoptions,但url_for仅使用一个参数调用它。

  def url_for(options = {})
    options ||= {}
    case options
    when String
      options
    when Hash
      options = options.symbolize_keys.reverse_merge!(:only_path => options[:host].nil?)
      super
    when :back
      controller.request.env["HTTP_REFERER"] || 'javascript:history.back()'
    else
      polymorphic_path(options)
    end
  end


  def polymorphic_path(record_or_hash_or_array, options = {})
    polymorphic_url(record_or_hash_or_array, options.merge(:routing_type => :path))
  end

  def polymorphic_url(record_or_hash_or_array, options = {})
    if record_or_hash_or_array.kind_of?(Array)
      record_or_hash_or_array = record_or_hash_or_array.compact
      if record_or_hash_or_array.first.is_a?(ActionDispatch::Routing::RoutesProxy)
        proxy = record_or_hash_or_array.shift
      end
      record_or_hash_or_array = record_or_hash_or_array[0] if record_or_hash_or_array.size == 1
    end

    record = extract_record(record_or_hash_or_array)
    record = convert_to_model(record)

    args = Array === record_or_hash_or_array ?
      record_or_hash_or_array.dup :
      [ record_or_hash_or_array ]

    inflection = if options[:action] && options[:action].to_s == "new"
      args.pop
      :singular
    elsif (record.respond_to?(:persisted?) && !record.persisted?)
      args.pop
      :plural
    elsif record.is_a?(Class)
      args.pop
      :plural
    else
      :singular
    end

    args.delete_if {|arg| arg.is_a?(Symbol) || arg.is_a?(String)}
    named_route = build_named_route_call(record_or_hash_or_array, inflection, options)

    url_options = options.except(:action, :routing_type)
    unless url_options.empty?
      args.last.kind_of?(Hash) ? args.last.merge!(url_options) : args << url_options
    end

    args.collect! { |a| convert_to_model(a) }

    (proxy || self).send(named_route, *args)
  end
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因此,使用该scope选项正确调用应该听起来像

polymorphic_path([:new, :admin, :bio], bio_type: params[:bio_type])
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