rails has_one association fields_for表单不显示

Question

我有一个会议模型:

class Meeting < ActiveRecord::Base
  has_one :location, :class_name => "MeetingLocation", :dependent => :destroy
  accepts_nested_attributes_for :location

然后我有一个MeetingLocation模型:

class MeetingLocation < ActiveRecord::Base
  belongs_to :meeting

我的新会议表格:

<%= form_for @meeting do |f| %>
  <%= f.label :location %>
  <%= fields_for :location do |l| %>
    Name <%= l.text_field :name %>
    Street <%= l.text_field :street %>
    City <%= l.text_field :city, :class => "span2" %>
    State <%= l.select :state, us_states, :class => "span1" %>
    Zipcode <%= l.text_field :zip, :class => "span1" %>
  <% end %>

当我查看新会议表单时,位置字段为空!我只看到位置标签,但没有其他位置字段.我一直在寻找过去3个小时的解释,发现很多类似的问题,但没有运气.

谢谢.

Answer 1

未显示位置字段的原因是,当您创建新会议时@meeting = Meeting.new,此会议还没有关联的MeetingLocation.如果你打电话给@ meeting.location,你会得到零.因此,表单不显示该位置的字段.

要解决此问题,您应@meeting.build_location在创建新会议后致电.这会将新会议与空白位置相关联.

编辑:尝试fields_for改为f.fields_for