多对多:has_many:通过关联表单以及分配给链接模型的数据来创建表单视图 [英] many-to-many: has_many :through association form with data assigned to linking model create form view

问题描述

我正在玩Rails指南中的示例:

I'm playing with an example from Rails Guides:

http://guides.rubyonrails.org/association_basics.html# the-has_many-through-association

此示例对模型具有以下设置:

This example has the following setup for the models:

class Physician < ActiveRecord::Base
  has_many :appointments
  has_many :patients, :through => :appointments
end

class Appointment < ActiveRecord::Base
  belongs_to :physician
  belongs_to :patient
end

class Patient < ActiveRecord::Base
  has_many :appointments
  has_many :physicians, :through => :appointments
end

我正试图了解如何做以下两件事:

I'm trying to understand how to do the following two things:

1. 如何设置将创建新患者并使用现有医生指定约会时间的视图
2. 如何为现有患者分配新医师和预约时间的预约

我经历了RailsCasts 196& 197处理嵌套表单，但我不知道它如何适用于这种情况.

I went through the RailsCasts 196 & 197 that deal with nested forms, but I don't see how it would apply to this situation.

请问有人可以提供示例或指向我吗?

Can someone provide an example or point me to a guide on this please?

谢谢

推荐答案

首先，您必须将医师ID传递给您的PatientsController#new操作.如果用户通过跟踪链接到达那里，那将是

First you have to pass the physician ID to your PatientsController#new action. If users get there by folloing a link, this would be something like

<%= link_to 'Create an appointment', new_patient_path(:physician_id => @physician.id) %>

或者，如果用户必须提交表单，则可以使用它提交一个隐藏字段:

Or, if users have to submit a form, you can submit a hidden field with it:

<%= f.hidden_field :physician_id, @physician.id %>

然后，在PatientsController#new中:

def new
  @patient = Patient.new
  @physician = Physician.find(params[:physician_id])
  @patient.appointments.build(:physician_id => @physician.id)
end

在new.html.erb中:

<%= form_for @patient do |f| %>
  ...
  <%= f.fields_for :appointments do |ff |%>
    <%= ff.hidden_field :physician_id %>
    ...
  <% end %>
<% end %>

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