我正在尝试使用Ryan Bates优秀的'嵌套表单'来创建以下内容 - ＆gt;
创建新的“作业”时，用户可以选择写入多个关于它的项目符号，以及多个“角色”
以下是模型的设置方法：
工作模式
# == Schema Information
#
# Table name: jobs
#
# id :integer not null, primary key
# job_title :string(255)
# job_summary :string(255)
# qualifications :string(255)
# created_at :datetime
# updated_at :datetime
#
class Job < ActiveRecord::Base
validates :job_title, presence: true
validates :job_summary, presence: true
validates :qualifications, presence: true
has_many :bullets, dependent: :destroy
has_many :roles, dependent: :destroy
accepts_nested_attributes_for :bullets, :reject_if => lambda { |a| a[:bullet].blank? }, :allow_destroy => true
accepts_nested_attributes_for :roles, :reject_if => lambda { |a| a[:role_title].blank? }, :allow_destroy => true
#lambda { |a| a[:bullet].blank? } makes sure that on edit, if a value is left blank, then it doesn't save it
end
子弹模型
# == Schema Information
#
# Table name: bullets
#
# id :integer not null, primary key
# job_id :integer
# bullet :string(255)
# created_at :datetime
# updated_at :datetime
#
class Bullet < ActiveRecord::Base
belongs_to :job
validates :job_id, presence: true
validates :bullet, presence: true
end
角色模型
# == Schema Information
#
# Table name: roles
#
# id :integer not null, primary key
# job_id :integer
# role_title :string(255)
# role_desc :string(255)
# created_at :datetime
# updated_at :datetime
#
class Role < ActiveRecord::Base
belongs_to :job
validates :job_id, presence: true
validates :role_title, presence: true
validates :role_desc, presence: true
end
职位控制人员：
class JobsController < ApplicationController
before_action :signed_in_user, only: [:new, :create, :update, :show, :edit, :destroy] # index, at least partially is available to all viewers
before_action :admin_user, only: [:new, :edit, :update, :create, :destroy] # only admins can make jobs
def new
@job = Job.new
3.times {
@job.bullets.build
@job.roles.build
}
end
def create
@job = Job.new(job_params)
if @job.save
redirect_to root_path, :flash => { :success => "Job created!" }
else
render 'new'
end
end
def job_params
params.require(:job).permit(:job_title, :job_summary, :qualifications,
bullets_attributes: [:id, :bullet, :_destroy],
roles_attributes: [:id, :role_title,:role_desc, :_destroy])
end
end
工作/新视图
<% provide(:title, "Publish a new job") %>
<%= nested_form_for @job do |f| %>
<%= render 'shared/error_messages', object: f.object %>
<%= f.label :job_title %>
<%= f.text_field :job_title %>
<div style="margin-left:30px">
<%= f.fields_for :bullets do |bullet_form| %>
<%= bullet_form.label :bullet %>
<%= bullet_form.text_field :bullet %>
<%= bullet_form.link_to_remove "Remove this bullet" %>
<% end %>
<p><%= f.link_to_add "Add a Bullet", :bullets %></p>
</div>
<%= f.label :job_summary %>
<%= f.text_area :job_summary %>
<%= f.label :qualifications %>
<%= f.text_area :qualifications %>
<div style="margin-left:30px">
<%= f.fields_for :roles do |role_form| %>
<%= role_form.label :role_title %>
<%= role_form.text_field :role_title %>
<%= role_form.label :role_desc %>
<%= role_form.text_field :role_desc %>
<%= role_form.link_to_remove "Remove this Role" %>
<% end %>
<p><%= f.link_to_add "Add a Role", :roles %></p>
</div>
<%= f.submit "Publish the Job", class: "button" %>
<% end %>
* Bullets job can't be blank
* Roles job can't be blank
在我看来，job_id的信息并没有通过嵌套表单。
您的想法正在发生，并且非常感谢有关完成这项工作的想法：）
日志
以下是一些日志，以使其更清晰：
1）当我提交表单时，只选择1个项目符号，我在开发中得到以下参数：
--- !ruby/hash:ActionController::Parameters
utf8: ✓
authenticity_token: ezgktBZjcrdI6nMTro8Aqd0Djs2k3M+HFAdACrxajS8=
job: !ruby/hash:ActionController::Parameters
job_title: Job Title example
bullets_attributes: !ruby/hash:ActionController::Parameters
'0': !ruby/hash:ActiveSupport::HashWithIndifferentAccess
bullet: Example bullet
_destroy: 'false'
job_summary: Job Summary Example
qualifications: Example Qualifications here
roles_attributes: !ruby/hash:ActionController::Parameters
'1387448871560': !ruby/hash:ActiveSupport::HashWithIndifferentAccess
role_title: Example Role Name
role_desc: Example Role Description
_destroy: 'false'
commit: Publish the Job
action: create
controller: jobs
在我的Rails服务器上，这就是它所说的 - ＆gt;
Started POST "/jobs" for 127.0.0.1 at 2013-12-19 14:28:01 +0400
Processing by JobsController#create as HTML
Parameters: {"utf8"=>"✓", "authenticity_token"=>"ezgktBZjcrdI6nMTro8Aqd0Djs2k3M+HFAdACrxajS8=", "job"=>{"job_title"=>"Job Title example", "bullets_attributes"=>{"0"=>{"bullet"=>"Example bullet", "_destroy"=>"false"}}, "job_summary"=>"Job Summary Example", "qualifications"=>"Example Qualifications here", "roles_attributes"=>{"1387448871560"=>{"role_title"=>"Example Role Name", "role_desc"=>"Example Role Description", "_destroy"=>"false"}}}, "commit"=>"Publish the Job"}
User Load (0.3ms) SELECT "users".* FROM "users" WHERE "users"."remember_token" = '449addc616f3035c031b3220404a4d5eb5351c74' LIMIT 1
(0.2ms) begin transaction
(0.2ms) rollback transaction
Rendered shared/_error_messages.html.erb (2.4ms)
Rendered jobs/new.html.erb within layouts/application (15.7ms)
Rendered layouts/_shim.html.erb (0.1ms)
Rendered layouts/_header.html.erb (1.3ms)
Completed 200 OK in 101ms (Views: 32.0ms | ActiveRecord: 0.7ms | Solr: 0.0ms)
答案 0 :(得分：1)
根据您发布的内容，有几个问题可能导致问题
强大的参数
def job_params
params.require(:job).permit(:job_title, :job_summary, :qualifications,
bullets_attributes: [:bullet],
roles_attributes: [:role_title,:role_desc])
end
我不知道您为何调用了列role_title和role_desc，但最好只按实际名称调用列（title和{{1} }）
这基本上是因为如果你加载desc，那么写@role而不是@role.title会更有效率。你的其他表也一样
您可能希望更新您的架构以反映
ActiveRecord Build
第二个问题是你正在构建新的ActiveRecord对象3次：
@role.role_title如果您想发送3个对象，但是您只有1个，那就没关系了。我知道您已经完成了它，所以您可以添加额外的字段（我会在一秒钟内解释）
你应该改为：
def new
@job = Job.new
3.times {
@job.bullets.build
@job.roles.build
}
end
我认为这实际上是你的主要问题 - 如果你构建对象＆amp;它们没有填充，它们是空白的，不是吗？
我只会声明我想要显示的对象，并在需要时添加额外内容
添加字段
如果您希望动态添加字段（使用Ajax），我强烈推荐this tutorial。它使用与Ryan Bates的方法相同的原理，但是更加清洁＆amp;在需要时添加对象。如果你愿意，我可以通过聊天来讨论这个问题