Ruby:如何存储和显示一周中的某一天? [英] Ruby: How to store and display a day of the week?

问题描述

我对 Ruby 比较陌生.我需要在我的活动模型中跟踪一周中的某一天.到目前为止，我拥有的代码似乎不是最优雅的解决方案.我想知道是否有更好的方法.

到目前为止，这是我的表单:

<%= form_for(@activity) do |f|％＞<div class="field"><%= f.label :day%><br/><%= f.select :day, [['Sunday', 0], ['Monday', 1], ['Tuesday', 2], ['Wednesday', 3], ['Thursday', 4], ['星期五', 5], ['星期六', 6]] %>

<%结束%>

当我需要显示星期几时:

<% days = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'] %><% @activities.each 做 |activity|％＞<%=天[activity.day.to_i]%><%结束%>

我怎样才能做得更好?随意提及我可能不知道的任何图书馆/宝石.

解决方案:

Ruby 提供了 Date::DAYNAMES 常量，它是一周中的天数数组.我们可以在我们的代码中重用它:

<%= form_for(@activity) do |f|％＞<div class="field"><%= f.label :day%><br/><%= f.select :day, Date::DAYNAMES.zip((0..6).to_a) %>

<%结束%><% @activities.each 做 |activity|％＞<%= 日期::DAYNAMES[activity.day.to_i] %><%结束%>

解决方案

Ruby 的 Date 类已经定义了一个常量，用于在数组中保存日期的名称:Date::DAYNAMES.

例如，您可以执行以下操作:

days = []日期::DAYNAMES.each_with_index { |x, i|天<<[x, i] }

我不知道我是否一定要说这更好，但您绝对可以利用现有的东西.

I'm relatively new to Ruby. I need to keep track of a day of the week on my activity model. The code that I have so far doesn't seem like the most elegant solution. I am wondering if there is a better way.

So far, this is what I have in my form:

<%= form_for(@activity) do |f| %>
  <div class="field">
    <%= f.label :day %><br />
    <%= f.select :day, [['Sunday', 0], ['Monday', 1], ['Tuesday', 2], ['Wednesday', 3], ['Thursday', 4], ['Friday', 5], ['Saturday', 6]] %>
  </div>
<% end %>

And when I need to display the day of the week:

<% days = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'] %>
<% @activities.each do |activity| %>
  <%= days[activity.day.to_i] %>
<% end %>

How can I do this better? Feel free to mention any library/gem that I may not be aware of.

Solution:

Ruby provides the Date::DAYNAMES constant which is an array of days of the week. We can reuse that in our code:

<%= form_for(@activity) do |f| %>
  <div class="field">
    <%= f.label :day %><br />
    <%= f.select :day, Date::DAYNAMES.zip((0..6).to_a) %>
  </div>
<% end %>

<% @activities.each do |activity| %>
  <%= Date::DAYNAMES[activity.day.to_i] %>
<% end %>

解决方案

Ruby's Date class already has a constant defined that holds the name of the days in an array: Date::DAYNAMES.

For example, you could do something like:

days = []
Date::DAYNAMES.each_with_index { |x, i| days << [x, i] }

I don't know if I'd necessarily say that this is better, but you can definitely leverage what is already available to you.

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