如何全局覆盖 rails url helper? [英] How can I globally override a rails url helper?

问题描述

我需要对 foo_path 添加一个简单的更改，所以我这样做了:

I needed to add a simple change to foo_path, so I did this:

module ApplicationHelper
  # [...]

  def foo_path(foo, options = {})
    options.merge!(bar: foo.some_attribute)
    super
  end

  # [...]
end

现在，这在从视图调用时有效，但从控制器调用时，将使用没有我添加的原始变体.

Now, this works when called from a view, but when called from a controller, the original variant without my additions is used.

如何覆盖应用范围内的相应帮助程序 (_path/_url)?

推荐答案

我认为最简洁的方法是自定义 routes.rb 文件(至少对于静态默认参数).文档:http://guides.rubyonrails.org/routing.html#customizing-resourceful-路由

I think the cleanest way to achieve that is to customize routes.rb file (at least for static default parameters). Docs: http://guides.rubyonrails.org/routing.html#customizing-resourceful-routes

默认参数示例:

get "/foo(/:bar)" => "my_controller#index", defaults: { bar: "my_default" }

默认参数值示例 + 范围:

scope '/(:rec_type)', defaults: { rec_type: 'mammo' }, rec_type: /mammo|face/ do
  resources :patients
end

其他选项(用于动态限制):

Other options (for dynamic restriccions):

高级路由约束:

如果您需要更多高级/动态限制，请查看本指南:http://guides.rubyonrails.org/routing.html#advanced-constraints.

If you need more advanced/dynamic restrictions, take a look to this guide: http://guides.rubyonrails.org/routing.html#advanced-constraints.

覆盖 default_url_options:

此外，您可以覆盖 default_url_options 方法以使用路由助手自动添加一些属性(参数):http://guides.rubyonrails.org/action_controller_overview.html#default-url-options.

Also, you can override default_url_options method to automatically add some attributes (params) using routes helpers: http://guides.rubyonrails.org/action_controller_overview.html#default-url-options.

您可以通过在控制器中定义一个名为 default_url_options 的方法来设置 URL 生成的全局默认参数.这样的方法必须返回具有所需默认值的散列，其键必须是符号:

You can set global default parameters for URL generation by defining a method called default_url_options in your controller. Such a method must return a hash with the desired defaults, whose keys must be symbols:

class ApplicationController < ActionController::Base
  def default_url_options(options = {})
    if action_name == 'foo' # or other conditions
      options[:bar] = 'your_defaults' # add here your default attributes
    end

    options
  end
end

覆盖 to_param:

Rails 路由系统在模型上调用 to_param 以获取 :id 占位符的值.ActiveRecord::Base#to_param 返回模型的 id，但您可以在模型中重新定义该方法.例如，给定:

Rails routing system calls to_param on models to get a value for the :id placeholder. ActiveRecord::Base#to_param returns the id of a model, but you can redefine that method in your models. For example, given:

class Product < ActiveRecord::Base
  def to_param
    "#{id}-#{title}"
  end
end

这将生成:/products/254-Foo

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