ruby-on-rails-3 - 在 Rails 中构建日历导航( Controller 和 View 链接)

Question

点击 link_to 时尝试获取下个月。我在 View 中完成了以下操作。

index.html.erb

 <table class="rota">
  <thead>
  <tr>
    <!-- Element will carry the month number for initializing this table correctly. -->
    <th class="month"-<%= @date_range.month %>">Days</th>
    <% @hospitals.each do |hsp| %>
        <th class="hospital-<%= hsp.shortname %>"><%= hsp.name %></th>
    <% end %>
  </tr>
  </thead>
  <tbody>
  <% @date_range.each do |d| %>
      <tr>
        <th><%= d.to_s(:short) %></th>
        <% @hospitals.each do |hsp| %>
            <td class="day-<%= d.to_s(:short) %> hospital-<%= hsp.shortname %>">&nbsp;</td> <!--Class on each td to make it identifiable -->
        <% end %>
      </tr>
  <% end %>
  </tbody>
</table>

<%= form_tag rota_days_path, :method => 'get' do %>
    <p>
      <%= link_to 'Previous Month', rota_days_path(:beginning_of_month => @beginning_previous) %>
      <%= link_to 'Next Month', rota_days_path(:beginning_of_month => @beginning_next) %>
    </p>
<% end %>

Controller .rb

  class RotaDaysController < ApplicationController
      # GET /rota_days
      # GET /rota_days.json
      # load_and_authorize_resource
      respond_to :json, :html
      def index
        @rota_days = RotaDay.all
        @hospitals = Hospital.all
        @t1 = Date.today.at_beginning_of_month
        @t2 = Date.today.end_of_month
        @dates = (@t1..@t2)  #Concat variable t1 + t2 together
        # @next_month = Date.today + 1.month(params[: ??? ] #Old

        if params[:next_month]
         # @next_month = Date.today >> 1
          @next_month = params[:next_month] + 1.month
          @t1 = @next_month.at_beginning_of_month
          @t2 = @next_month.end_of_month
          @dates = (@t1..@t2)
        end

        @title = "Rota"

        respond_to do |format|
          format.html # index.html.erb
          format.json { render json: @rota_days }
        end
      end

我已经确定这可能不起作用的原因是由于我的 Controller 中的以下内容 @next_month = params[:next_month] + 1.month 最后两个调用的方法被定义仅针对时间/日期对象。但不适用于 fixnum/string 对象。我知道我错过了一些东西

更新

我发现实际问题是 `params[:next_month] 是一个字符串，我试图向其中添加一个日期。这意味着我需要将字符串转换为日期/时间对象。

控制台输出:

Started GET "/rota_days" for 127.0.0.1 at 2012-12-14 22:14:36 +0000
Processing by RotaDaysController#index as HTML
  User Load (0.0ms)  SELECT `users`.* FROM `users` WHERE `users`.`id` = 1 LIMIT 1
  RotaDay Load (0.0ms)  SELECT `rota_days`.* FROM `rota_days` 
  Hospital Load (1.0ms)  SELECT `hospitals`.* FROM `hospitals` 
  Rendered rota_days/index.html.erb within layouts/application (23.0ms)
  Role Load (0.0ms)  SELECT `roles`.* FROM `roles` INNER JOIN `roles_users` ON `roles`.`id` = `roles_users`.`role_id` WHERE `roles_users`.`user_id` = 1 AND `roles`.`name` = 'Administrator' LIMIT 1
Completed 200 OK in 42ms (Views: 39.0ms | ActiveRecord: 1.0ms)

Answer 1

我已经采用了您的代码并对其进行了一些改进，以处理月份之间的导航

class RotaDaysController < ApplicationController
  respond_to :json, :html

  def index
    @title = "Rota"
    @rota_days = RotaDay.all
    @hospitals = Hospital.all

    # Find the beginning of the month we are currently displaying
    #   it can be either passed in through the params[:beginning_of_month]
    #   which is a string we parse into a date by calling '2013-01-01'.to_date
    #   By wrapping the .to_date call in .try(:to_date), the call will not throw
    #   a NoMethodError if no params[:beginning_of_month] is passed in and thus
    #   we would call nil.to_date => throws NoMethodError
    #
    #   If no parameter is passed in we want to display the current month
    @beginning_current = params[:beginning_of_month].try(:to_date) || Date.current.beginning_of_month

    # Let's build the date range of the month to display
    #   The nice thing about date / time ranges is that you can iterate over them
    #   in the view to create the calendar interface we are looking for
    @date_range = (@beginning_current.beginning_of_month..@beginning_current.end_of_month) 

    # Build references for previous and next month for navigation
    #   We can use the beginning of the previous and next month as a reference
    #   for which month to display.
    @beginning_next     = (@beginning_current + 1.month).beginning_of_month.to_s
    @beginning_previous = (@beginning_current - 1.month).beginning_of_month.to_s      

    respond_to do |format|
      format.html # index.html.erb
      format.json { render json: @rota_days }
    end
  end
end

在 View 中，您可以在 link_to 帮助程序中使用这些字符串。

<%= form_tag rota_days_path, :method => 'get' do %>
  <p>
    <%= link_to 'Previous Month', rota_days_path(:beginning_of_month => @beginning_previous) %>
    <%= link_to 'Next Month', rota_days_path(:beginning_of_month => @beginning_next) %>
  </p>
<% end %>

您还可以迭代日期范围以在 View 中显示每个日期

<% @date_range.each do |day| %>
  ...
<% end %>

我希望这有帮助。您可以随意提出任何问题，但我可能要等到明天才能回复您。