Rails has_many:通过嵌套形式 [英] Rails has_many :through nested form

问题描述

我刚刚跳入has_many :through关联.我正在尝试通过一种形式来实现为所有3个表(Physician，Patient和关联表)保存数据的功能.

I have just jumped into has_many :through association. I'm trying to implement the ability to save data for all 3 tables (Physician, Patient and association table) through a single form.

class CreatePhysicians < ActiveRecord::Migration
  def self.up
    create_table :physicians do |t|
      t.string :name
      t.timestamps
    end
  end
end

class CreatePatients < ActiveRecord::Migration
  def self.up
    create_table :patients do |t|
      t.string :name
      t.timestamps
    end
  end
end

class CreateAppointments < ActiveRecord::Migration
  def self.up
    create_table :appointments do |t|
      t.integer :physician_id
      t.integer :patient_id
      t.date :appointment_date
      t.timestamps
    end
  end
end

我的模特:

class Patient < ActiveRecord::Base
  has_many :appointments
  has_many :physicians, :through => :appointments
  accepts_nested_attributes_for :appointments
  accepts_nested_attributes_for :physicians
end
class Physician < ActiveRecord::Base
  has_many :appointments
  has_many :patients, :through => :appointments
  accepts_nested_attributes_for :patients
  accepts_nested_attributes_for :appointments
end
class Appointment < ActiveRecord::Base
  belongs_to :physician
  belongs_to :patient
end

我的控制器:

def new
    @patient = Patient.new
    @patient.physicians.build
    @patient.appointments.build
end

我的视图(new.html.rb):

My view (new.html.rb):

<% form_for(@patient) do |patient_form| %>
  <%= patient_form.error_messages %>
  <p>
    <%= patient_form.label :name, "Patient Name" %>
    <%= patient_form.text_field :name %>
  </p>
  <%  patient_form.fields_for :physicians do |physician_form| %>
    <p>
      <%= physician_form.label :name, "Physician Name" %>
      <%= physician_form.text_field :name %>
    </p>
 <% end %>

  <p>
    <%= patient_form.submit 'Create' %>
  </p>
<% end %>

<%= link_to 'Back', patients_path %>

我能够为Appointment创建一个新的Patient，Physician和相关记录，但是现在我也希望在表单中也有一个appointment_date字段.我应该在哪里放置Appointment的字段，并且控制器中需要进行哪些更改?我尝试了Google搜索，并尝试了 this ，但是在实现它时陷入了某些或其他错误.

I'm able to create a new Patient, Physician and associated record for an Appointment, but now I want to have field for appointment_date too in form. Where should I place fields for Appointments and what changes are required in my controller? I tried googling and tried this, but got stuck in some or other error implementing it.

推荐答案

好，这个小问题让我困扰了几个小时，所以我将在这里发布我的工作解决方案，希望可以节省一些时间偷看.这适用于Rails 4.0和Ruby 2.0.这也克服了我遇到的符号到整数转换"的问题.

Ok, this little bugger of a question stumped me for a few hours, so I'm going to post my working solution on here in hopes it shaves some time for peeps. This is for Rails 4.0 and Ruby 2.0. This also overcame a "symbol to integer conversion" issue I had.

型号:

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

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

class Physicians < ActiveRecord::Base
  has_many :appointments
  has_many :patients, through: :appointments
end

控制器:

def new
  @patient= Patient.new 
  @appointments = @patient.appointments.build
  @physician = @appointments.build_physician 
end

def create
  Patient.new(patient_params)
end


def patient_params
   params.require(:patient).permit(:id, appointments_attributes: [:id, :appointment_time, physician_attributes: [:id ] )
end

查看

<% form_for(@patient) do |patient_form| %>
  <%= patient_form.error_messages %>
  <p>
    <%= patient_form.label :name, "Patient Name" %>
    <%= patient_form.text_field :name %>
  </p>

  <% patient_form.fields_for :appointments do |appointment_form| %>
    <p>
      <%= appointment_form.label :appointment_date, "Appointment Date" %>
      <%= appointment_form.date_field :appointment_date %>
    </p>

    <% appointment_form.fields_for :physician do |physician_form| %>
      <p>
        <%= physician_form.label :name, "Physician Name" %>
        <%= physician_form.text_field :name %>
      </p>
    <% end %>
  <% end %>

  <p>
    <%= patient_form.submit 'Create' %>
  </p>
<% end %>

<%= link_to 'Back', patients_path %>

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