如何使用带有datetime元素的group_by date在日历上按天显示？

我在模型上使用了datetime元素，但由于某些原因，我无法在日历中显示它。我在控制器和视图中使用代码来实现这一点，CSS是不相关的，我想我不会包括它。我也在用散列来做

事件控制器：

  def calendarpage
    @events = Event.all
    @events_by_date = @events.group_by(&:edate)
    @date = params[:date] ? Date.parse(params[:date]) : Date.today
  end

日历页面视图：

<h1>My Calendar</h1>
<div id="events">
<h2 id="month">
    <%= link_to "<", date: @date.prev_month %>
    <%= @date.strftime("%B %Y") %>
    <%= link_to ">", date: @date.next_month %>
</h2>
<%= calendar @date do |date| %>
  <%= date.day %>
  <% if @events_by_date[date] %><!-- is this even populated?? -->
    <ul>
        <% @events_by_date[date].each do |event| %>
            <li><%= link_to event.title, event%></li> <!-- THIS IS WHAT DOESN'T SHOW -->
        <% end %>
    </ul>   
  <% end %>
<% end %>

这也可能有用，尽管我不这么认为： 日历助手.rb

module CalendarHelper
    def calendar(date = Date.today, &block)
        Calendar.new(self, date, block).table
    end

    class Calendar < Struct.new(:view, :date, :callback)
        HEADER = %w[Sunday Monday Tuesday Wednesday Thursday Friday Saturday]
        START_DAY = :sunday

        delegate :content_tag, to: :view

        def table 
            content_tag :table, class: "calendar" do 
                header + week_rows              
            end
        end

        def header
            content_tag :tr do
                HEADER.map { |day| content_tag :th, day }.join.html_safe
            end
        end

        def week_rows
            weeks.map do |week|
                content_tag :tr do
                    week.map { |day| day_cell(day) }.join.html_safe
                end
            end.join.html_safe
        end

        def day_cell(day)
            content_tag :td, view.capture(day, &callback), class: day_classes(day)
        end

        def day_classes(day)
            classes = []
            classes << "today" if day == Date.today
            classes << "notmonth" if day.month != date.month
            classes.empty? ? nil : classes.join(" ")
        end

        def weeks
            first = date.beginning_of_month.beginning_of_week(START_DAY)
            last = date.end_of_month.end_of_week(START_DAY)
            (first..last).to_a.in_groups_of(7)
        end
    end
end

这可能是因为我不明白哈希表是如何工作的，但有东西告诉我控制器中没有填充@events\u by\u date：

我该怎么办

module CalendarHelper
    def calendar(date = Date.today, &block)
        Calendar.new(self, date, block).table
    end

    class Calendar < Struct.new(:view, :date, :callback)
        HEADER = %w[Sunday Monday Tuesday Wednesday Thursday Friday Saturday]
        START_DAY = :sunday

        delegate :content_tag, to: :view

        def table 
            content_tag :table, class: "calendar" do 
                header + week_rows              
            end
        end

        def header
            content_tag :tr do
                HEADER.map { |day| content_tag :th, day }.join.html_safe
            end
        end

        def week_rows
            weeks.map do |week|
                content_tag :tr do
                    week.map { |day| day_cell(day) }.join.html_safe
                end
            end.join.html_safe
        end

        def day_cell(day)
            content_tag :td, view.capture(day, &callback), class: day_classes(day)
        end

        def day_classes(day)
            classes = []
            classes << "today" if day == Date.today
            classes << "notmonth" if day.month != date.month
            classes.empty? ? nil : classes.join(" ")
        end

        def weeks
            first = date.beginning_of_month.beginning_of_week(START_DAY)
            last = date.end_of_month.end_of_week(START_DAY)
            (first..last).to_a.in_groups_of(7)
        end
    end
end

<% @events_by_date["7"].each do |event| %>
    <li><%= link_to event.title, event%></li>
<% end %>

undefined method `each' for nil:NilClass