Question

Rails正在正确创建一个父对象及其子级，并为每个子对象插入新记录，但随后它将删除子级。父对象本身是另一个已创建对象的子对象。这是模特：

class Pool < ActiveRecord::Base
 has_many :addresses, dependent: :destroy

 accepts_nested_attributes_for :addresses, allow_destroy: true
end

class Address < ActiveRecord::Base
  belongs_to :pool
  has_one :ipv4, dependent: :destroy
  has_one :ipv6, dependent: :destroy
  has_one :mac_address, dependent: :destroy

  accepts_nested_attributes_for :ipv4, :ipv6, :mac_address
end

class Ipv4 < ActiveRecord::Base
end

这是控制器

class AddressesController < ApplicationController
  def index
  end

  def create
    @pool = Pool.find(params[:pool_id])
    @address = @pool.addresses.create(addresses_params)
    #Maybe not needed here?
    ipv4 = @address.build_ipv4
    ipv6 = @address.build_ipv6
    mac_address = @address.build_mac_address
    redirect_to pool_path(@pool)
  end

  def destroy
    @pool = Pool.find(params[:pool_id])
    @address = @pool.addresses.find(params[:id])
    @address.destroy
    redirect_to pool_path(@pool)
  end

  private
    def addresses_params
      params.require(:address).permit(:name, :notes, :hostname, :device_description, :id, :ipv4_attribute
s => [:octet_1, :octet_2, :octet_3, :octet_4, :id], :ipv6_attributes => [:group_1, :group_2, :group_3, :g
roup_4, :group_5, :group_6, :group_7, :group_8, :id], :mac_address_attributes => [:octet_1, :octet_2, :oc
tet_3, :octet_4, :octet_5, :octet_6, :id])
    end
end

以下表格：

<%= form_for @address, url:  pool_addresses_path(@address.pool) do |f| %>
<div class="field">
  <%= f.fields_for :ipv4 do |ipv4_fields| %>
     <%= label_tag :ipv4, 'IPv4' %>:
     <%= render 'ipv4', :f => ipv4_fields %>
  <% end %>
</div>

<div class="field">
  <%= f.fields_for :ipv6 do |ipv6_fields| %>
     <%= label_tag :ipv6, 'IPv6' %>:
     <%= render 'ipv6', :f => ipv6_fields %>
  <% end %>
</div>

<div class="field">
  <%= f.fields_for :mac_address do |mac_fields| %>
     <%= label_tag :mac_address, 'MAC' %>:
     <%= render 'mac', :f => mac_fields %>
  <% end %>
</div>

<div class="field">
  <%= f.label :hostname %>:
  <%= f.text_field :hostname %>
</div>

<div class="field">
  <%= f.label :device_description %>:
  <%= f.text_field :device_description %>
</div>

<div class="field">
  <%= f.label :notes %><br>
  <%= f.text_area :notes %>
</div>

<div class="actions">
  <%= f.submit %>
</div>
<% end %>

这就是我点击提交按钮时在开发日志中看到的内容：

Started POST "/pools/11/addresses" for 192.168.46.1 at 2014-06-12 13:28:16 -0700
Processing by AddressesController#create as HTML
  Parameters: {"utf8"=>"â", "authenticity_token"=>"pnWjd4/Tu8pjZL7PWttvHXmV3SDWPcx4JrSkB50ccws=", "address"=>{"ipv4_attributes"=>{"octet_1"=>"23", "octet_2"=>"", "octet_3"=>"", "octet_4"=>""}, "ipv6_attributes"=>{"group_1"=>"44", "group_2"=>"", "group_3"=>"", "group_4"=>"", "group_5"=>"", "group_6"=>"", "group_7"=>"", "group_8"=>""}, "mac_address_attributes"=>{"octet_1"=>"22", "octet_2"=>"", "octet_3"=>"", "octet_4"=>"", "octet_5"=>"", "octet_6"=>""}, "hostname"=>"cornery", "device_description"=>"peeler", "notes"=>"address notes"}, "commit"=>"Create Address", "pool_id"=>"11"}
  Pool Load (0.2ms)  SELECT  "pools".* FROM "pools"  WHERE "pools"."id" = ? LIMIT 1  [["id", 11]]
   (0.1ms)  begin transaction
  SQL (0.5ms)  INSERT INTO "addresses" ("created_at", "device_description", "hostname", "notes", "pool_id", "updated_at") VALUES (?, ?, ?, ?, ?, ?)  [["created_at", "2014-06-12 20:28:16.554014"], ["device_description", "peeler"], ["hostname", "cornery"], ["notes", "address notes"], ["pool_id", 11], ["updated_at", "2014-06-12 20:28:16.554014"]]
  SQL (0.2ms)  INSERT INTO "ipv4s" ("address_id", "created_at", "octet_1", "octet_2", "octet_3", "octet_4", "updated_at") VALUES (?, ?, ?, ?, ?, ?, ?)  [["address_id", 13], ["created_at", "2014-06-12 20:28:16.556819"], ["octet_1", "23"], ["octet_2", ""], ["octet_3", ""], ["octet_4", ""], ["updated_at", "2014-06-12 20:28:16.556819"]]
  SQL (0.2ms)  INSERT INTO "ipv6s" ("address_id", "created_at", "group_1", "group_2", "group_3", "group_4", "group_5", "group_6", "group_7", "group_8", "updated_at") VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)  [["address_id", 13], ["created_at", "2014-06-12 20:28:16.559416"], ["group_1", "44"], ["group_2", ""], ["group_3", ""], ["group_4", ""], ["group_5", ""], ["group_6", ""], ["group_7", ""], ["group_8", ""], ["updated_at", "2014-06-12 20:28:16.559416"]]
  SQL (0.2ms)  INSERT INTO "mac_addresses" ("address_id", "created_at", "octet_1", "octet_2", "octet_3", "octet_4", "octet_5", "octet_6", "updated_at") VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)  [["address_id", 13], ["created_at", "2014-06-12 20:28:16.562105"], ["octet_1", "22"], ["octet_2", ""], ["octet_3", ""], ["octet_4", ""], ["octet_5", ""], ["octet_6", ""], ["updated_at", "2014-06-12 20:28:16.562105"]]
   (7.0ms)  commit transaction
   (0.0ms)  begin transaction
  SQL (0.2ms)  DELETE FROM "ipv4s" WHERE "ipv4s"."id" = ?  [["id", 15]]
   (13.0ms)  commit transaction
   (0.1ms)  begin transaction
  SQL (0.2ms)  DELETE FROM "ipv6s" WHERE "ipv6s"."id" = ?  [["id", 15]]
   (9.0ms)  commit transaction
   (0.1ms)  begin transaction
  SQL (0.2ms)  DELETE FROM "mac_addresses" WHERE "mac_addresses"."id" = ?  [["id", 15]]
   (8.7ms)  commit transaction
Redirected to http://192.168.46.137:3000/pools/11
Completed 302 Found in 82ms (ActiveRecord: 53.1ms)

当Rails重定向到Pool控制器的show方法时，除undefined method octet_1' for nil:NilClass错误外没有错误，因为没有任何东西，因为Rails删除了所有Address对象的孩子！

有什么线索在这里发生了什么？

谢谢！

Answer 1

在此处找到线索：nested attributes works for create but fails when update a record [resolved]

我从AddressesController创建操作中删除了构建操作：

class AddressesController < ApplicationController
  def index
  end

  def create
    @pool = Pool.find(params[:pool_id])
    @address = @pool.addresses.create(addresses_params)
    #Maybe not needed here?
    #ipv4 = @address.build_ipv4
    #ipv6 = @address.build_ipv6
    #mac_address = @address.create_mac_address
    redirect_to pool_path(@pool)
  end
end

我添加了构建操作，因为表单没有显示子对象的字段。他们现在在那里，所以我认为@address = @pool.addresses.create(addresses_params)正在创造它们？

Rails 4.1控制器创建，插入然后删除记录？

1 个答案: