rails 4-连接collection_select中的字段 [英] rails 4 -- concatenate fields in collection_select

问题描述

我正在通过一些教程来学习Rails 4，并构建一个演示应用程序.

I'm working on learning Rails 4 via several tutorials, and building a demo app.

我有一个名为players的表，该表链接到team表.球队有很多球员，一个球员只有一个球队.因此，我正在使用collection_select标记将球队数据提取到球员表格中.

I have a table called players that links to a team table. The team has many players, a player has only one team. So I'm using a collection_select tag to pull the team data into the player form.

它看起来像这样:

<%= collection_select :player, :team_id, Team.find(:all), :id, :name, options ={:prompt => "Select a team"} %>

这很好用-但我想让格式看起来像团队名称:Team City"-我不知道如何在标签中连接:name和:city值.这可能吗?

This works fine-- but I'd like to have the format look like "Team Name: Team City"-- I can't figure out how to concatenate the :name and :city values in the tag however. Is this possible?

推荐答案

在您的Team模型中创建一个方法，如下所示:

Create a method in your Team model like the following one

  def name_with_city
    "#{name}: #{city}"
  end

然后按如下所示使用它

<%= collection_select :player, :team_id, Team.find(:all), :id, :name_with_city, {:prompt => "Select a team"} %>

在文档中找到有关collection_select的更多信息

Find out more about collection_select in the documentation

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