Ruby on Rails - Railscast＃213日历排序按日期时间不是日期 [英] Ruby on Rails - Railscast #213 Calendar sort by datetime not date

问题描述

我正在建立一个涉及日历的应用程式。我发现，建立一个日历的铁轨，虽然日期证明是非常有益的。我有一切正常运行我只是试图允许每个日期的内容由日期时间组织，而不只是日期，因此它们按正确的时间顺序出现。

I am building an app that involves a calendar. I found that the railscast for building a calendar although dated proved to be very helpful. I have everything up and running I am just trying to allow for the contents on each date to be organized by the datetime and not just the date so they appear in the right chronological order.

我的目前控制器如下：

def index
  @lessons = Lesson.all
  @lesson_by_date = @lessons.group_by { |i| i.lesson_date.to_date }
  @date = params[:date] ? Date.parse(params[:date]) : Date.today
end

将非常感谢。感谢

推荐答案

我假设你的问题是如何组织我的@lessons由datetime。有几个不同的场景我会提到。我有点有限，因为我不知道从你的帖子你是如何组织架构的桌子，但我认为控制器给我一个大棒的想法。

I'm going off the assumption your question is how do I organize my @lessons by datetime. There are a few different scenarios I'll mention. I'm a bit limited since I don't know from your post how you've organized your schema for the table, but I think the controller gives me a ballpark idea.

1）
您应该替换：

1) You should replace:

@lesson = Lesson.all
@lesson_by_date = @lessons.group_by { |i| i.lesson_date.to_date }

使用更快的东西：

@lesson_by_date = Lesson.order('lesson_date')

$ b b

2）
如果你想知道为什么你当前的代码不工作，因为你的group_by块试图将i.lesson_date转换为一个日期IE to_date。

2) If you're wondering why your current code isn't working it's because your group_by block is trying to convert i.lesson_date to a date IE to_date. Instead you may want to try to_datetime.

3）我会查看 http://apidock.com/rails/ActiveRecord/QueryMethods/order

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