Rails多模型形式

Question

我有5个模型，我需要创建一个独特的表单，可以为每个模型创建一个新的对象。模型是

Contract.rb
    belongs_to :establishment

Establishment.rb
    has_many :contracts
    belongs_to :address
    belongs_to :client

Address.rb
    has_many :establishments
    belongs_to :zip

Client.rb
    has_many :establishments

Zip.rb
    has_many :addresses

要创建对象的表单是Contract的表单。

我的第一种方法是分别创建fields_for --其他模型，例如：

_form.html.erb

<%= form_for(@contract) do |f| %>
<% if @contract.errors.any? %>
<div id="error_explanation">
  <h2><%= pluralize(@contract.errors.count, "error") %> prohibited this contract from being saved:</h2>
...#fields for contract
<%= f.fields_for @client do |client|%>
  <%=client.label 'Name'%><%=client.text_field :name%>
  ...#other fields for client
<%= f.fields_for @address do |address|%>
  <%=address.label 'Street'%><%=address.text_field :street%>
  ...#other fields for address
<%=f.fields_for @zip do |zip|%>
  <%=zip.label 'Code'%><%=zip.number_field :code%>
  ...#other fields for zip

表单工作正常，得到了所有字段，但是在ContractController.rb上，我无法访问params上的地址、客户端和Zip字段。如果我使用@client = Client.create(params[:client])，它将不会得到一个错误，但不会在模型上创建一个对象。我意识到，params[:client] (以及其他人认为不是合同的)是零的。然后我使用params[:contract][:client]得到了错误ForbiddenAttributesError..。

所以，我决定改变方法，开始用多级nested_attributes来思考，但我仍然没有.

我已经把模特改成：

Contract.rb
    belongs_to :establishment
    accepts_nested_attributes_for :establishment

    has_one :address, through: :establishment
    accepts_nested_attributes_for :address

    has_one :zip, through: :address
    accepts_nested_attributes_for :zip

    has_one :client, :through => :establishment
    accepts_nested_attributes_for :client

在我做的控制器上

ContractController.rb

def new
  @contract = Contract.new
  @establishment = @contract.build_establishment
  @address = @establishment.build_address
  @zip = @address.build_zip
  @client = @establishment.build_client
end

但是现在表单没有用于Client, Address and Zip的字段

可以创建这种类型的表单吗？

Answer 1

-编辑的答案--删除_attributes在[:contract][:client_attributes][:...] (和:zip和:address)处的地址

G.B.差点就拿到了，但这还不够。

回到第一种方法，在阅读了这个文章之后，我做了以下更改：

Contract
_form.html.erb

  <%= form_for(@contract) do |f| %>
  <% if @contract.errors.any? %>
  <div id="error_explanation">
    <h2><%= pluralize(@contract.errors.count, "error") %> prohibited this contract from                   being saved:</h2>
  ...#fields for contract
  <%= f.fields_for :client, @client do |client|%>
    <%=client.label 'Name'%><%=client.text_field :name%>
    ...#other fields for client
  <%= f.fields_for :address, @address do |address|%>
    <%=address.label 'Street'%><%=address.text_field :street%>
    ...#other fields for address
  <%=f.fields_for :zip, @zip do |zip|%>
    <%=zip.label 'Code'%><%=zip.number_field :code%>
    ...#other fields for zip

因此，它必须是f.fields_for @client do |client| (地址和zip相同)，而不是f.fields_for :client, @client do |client|。

论ContractController

def new
  @contract = Contract.new
  @client = Client.new
  @address = Address.new
  @zip = Zip.new
end

def create
  @contract = Contract.new(contract_params)

  if !Zip.exists?(:cod_postal1 => params[:contract][:zip][:cod_postal1], :cod_postal2 => params[:contract][:zip][:cod_postal2])
    create_zip
  elsif
    @zip = Zip.where(:cod_postal1 => params[:contract][:zip][:cod_postal1], :cod_postal2 => params[:contract][:zip][:cod_postal2])
  end

  create_client
  create_address
  @address.zip = @zip
  @establishment = Establishment.new(:sede => true)
  @establishment.address = @address
  @establishment.client = @client
  @client.save
  @address.save
  @establishment.save
  @contract.establishment = @establishment

  respond_to do |format|
    if @contract.save
    ...
end

def create_client
  @client = Client.create(
                          :numero => params[:contract][:client][:numero],
                          ...#other client fields
                         )
end

def create_zip
  @zip = Zip.create(
                    :distrito => params[:contract][:zip][:distrito],
                    :concelho => params[:contract][:zip][:concelho],
                    ...#other zip fields
  )      
end

def create_address
  @address = Address.create(
                            :rua => params[:contract][:address][:rua],
                            ...#other address fields
  )
end

这起作用很大。在一个有一个提交按钮的表单中，创建了不同的模型

Answer 2

如果要使用accepts_nested_attributes_for，请从API接口中记住这一点：

“嵌套属性允许您通过父属性在关联记录上保存属性”

因此，这样说是无效的：

Class Contract #child class 
   belongs_to :establishment
   accepts_nested_attributes_for :establishment

因为Contract是child。不是Parent。

正确的做法是：

Class Establishment # parent class
    has_many :contracts
    accepts_nested_attributes_for :contracts

然后在Establishments控制器params中添加：

contracts_attributes: [:id, attribute1, attribute2] #不要忘记添加:id

对所有其他模型都采用相同的方法。阅读API接口中的示例