嵌套属性未以简单形式显示 [英] Nested attributes not showing up in simple form

问题描述

给出以下内容:

class Location < ActiveRecord::Base
  has_many :games
end

class Game < ActiveRecord::Base
  validates_presence_of :sport_type

  has_one :location
  accepts_nested_attributes_for :location
end

控制器

  def new
    @game = Game.new
  end

查看(窗体)

<%= simple_form_for @game do |f| %>
  <%= f.input :sport_type %>
  <%= f.input :description %>
  <%= f.simple_fields_for :location do |location_form| %>
    <%= location_form.input :city %>
  <% end %>
  <%= f.button :submit %>
<% end %>

为什么位置字段(城市)没有显示在表格中?我没有任何错误.我想念什么?

Why the locations field (city) are not showing up in the form? I am not getting any error. What am I missing?

推荐答案

好吧，我不确定您是否要选择一个与名气相关的现有位置，或者是否希望为每个游戏创建一个新位置.

Ok I'm not sure if you are looking to pick an existing location to associate with the fame or if you are wishing to create a new location for each game.

假设这是第一种情况:

更改游戏模型中的关联，以使游戏属于某个位置.

Change the association in the Game model so that a game belongs to a location.

class Game < ActiveRecord::Base
  validates_presence_of :sport_type

  belongs_to :location
  accepts_nested_attributes_for :location
end

您可能需要通过迁移将location_id字段添加到游戏模型中.

You may need to add a location_id field to your Game model via a migration.

然后，您将要更改游戏模型本身上的位置"字段，而不是嵌套表单.

Then instead of a nested form you are just going to be changing the Location field on the Game model itself.

如果是第二种情况，并且您希望为每个游戏建立一个新位置，那么您将需要按以下方式更改模型:

If it is the second scenario and you wish to build a new location for each game then you will need to change your models as follows:

class Location < ActiveRecord::Base
  belongs_to :game
end

class Game < ActiveRecord::Base
   validates_presence_of :sport_type

  has_one :location
  accepts_nested_attributes_for :location
end

如果您还没有一个game_id字段，则需要将其添加到位置模型中.

You will need to add a game_id field to the location model if you do not already have one.

然后，在您的控制器中，您将需要构建一个位置，以便显示嵌套的表单字段:

Then in your controller you will need to build a location in order to get the nested form fields to show:

def new
 @game = Game.new
 @location = @game.build_location 
end

这篇关于嵌套属性未以简单形式显示的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！