Question

我正在尝试构建一个块助手，但我似乎无法找到一种方法来访问current_page？来自班上。

我的帮助文件如下所示：

class NavList

    include ActionView::Helpers::TagHelper
    include ActionView::Helpers::UrlHelper

    def header(title)
        content_tag :li, title, class: 'nav-header'
    end

    def link(title, path, opts={})

        content_tag :li, link_to(title, path), class: opts[:class]
    end

end

    def nav_list(&block)
    new_block = Proc.new do
        helper = NavList.new
        block.call(helper)
    end
    content_tag :ul, capture(&new_block), class: 'nav nav-list'
end

我可以通过

使用帮助器

<%= nav_list do |nl| %>
    <%= nl.header 'Location' %>
    <%= nl.link 'Basic Information', url_for(@department), class: current_page?(@departments) ? 'active' : '' %>
    <%= nl.link 'Employees', department_users_path(@department) %>
<% end %>

但我想做的是不必经常接受那个活跃的课程。所以我想做这样的事情

 def link(title, path, opts={})
    css_class = 'inactive'
    css_class = 'active' if current_page?(path)
content_tag :li, link_to(title, path), class: opts[:class]
 end

但是我找不到使用current_page的方法？来自NavList类。它包含了一个未找到的请求方法

Answer 1

根据documentation当前页面？方法需要请求对象，也许您可以尝试将请求对象直接传递给链接方法。

def link(title, path, request, opts={})
    css_class = 'inactive'
    css_class = 'active' if current_page?(path)
    content_tag :li, link_to(title, path), class: opts[:class]
 end

<%= nl.link 'Employees', department_users_path(@department), request %>

Answer 2

不确定是否有更好的方式

class NavList
attr_accessor :request
    include ActionView::Helpers::TagHelper
    include ActionView::Helpers::UrlHelper

    def header(title)
        content_tag :li, title, class: 'nav-header'
    end

    def link(title, path, opts={class: ''})
      opts[:class] = "#{opts[:class]} active" if current_page?(path)
        content_tag :li, link_to(title, path), class: opts[:class]
    end

end


def nav_list(&block)
    new_block = Proc.new do
        helper = NavList.new
        helper.request = request
        block.call(helper)
    end
    content_tag :ul, capture(&new_block), class: 'nav nav-list'
end

Rails帮助与块和使用current_page

2 个答案: