Ruby on rails 嵌套对象有一个关系

我是rails新手，我尝试用两个对象做一个crud，并且有一个关系，我有一个项目和相册，每个项目和相册只有一个：name属性。但是当我创建一个项目时，两个名称都是空的。这是我的密码：

project.rb，album.rb

class Project < ActiveRecord::Base
 has_one :album
 accepts_nested_attributes_for :album, allow_destroy: true
end

class Album < ActiveRecord::Base
 belongs_to :project
end

_form.html.erb（项目）

由表格提交

    Started POST "/projects" for ::1 at 2016-01-22 18:39:16 -0200
Processing by ProjectsController#create as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"asJbsifN/NB2/LGY0xb8S0+OnsRlJMJqhVe3vUOzEyLPAMQN1VFcDiFOwSNcXu+V1wZ78obnc6uaacCzxDdW8A==", "project"=>{"name"=>"test", "album_attributes"=>{"name"=>"test"}}, "commit"=>"Create Project"}
   (0.2ms)  begin transaction
  SQL (0.3ms)  INSERT INTO "projects" ("name", "created_at", "updated_at") VALUES (?, ?, ?)  [["name", "test"], ["created_at", "2016-01-22 20:39:16.515028"], ["updated_at", "2016-01-22 20:39:16.515028"]]
  SQL (0.1ms)  INSERT INTO "albums" ("name", "project_id", "created_at", "updated_at") VALUES (?, ?, ?, ?)  [["name", "test"], ["project_id", 7], ["created_at", "2016-01-22 20:39:16.517545"], ["updated_at", "2016-01-22 20:39:16.517545"]]
   (0.6ms)  commit transaction
Redirected to http://localhost:3000/projects/7
Completed 302 Found in 7ms (ActiveRecord: 1.3ms)

my projets/show.html.erb

<p id="notice"><%= notice %></p>

<p>
  <strong>Project Name:</strong>
  <%= @project.name %>
</p>

<p>
  <strong>Album Name:</strong>
  <%= @project.album.name %>
</p>



<%= link_to 'Edit', edit_project_path(@project) %> |
<%= link_to 'Back', projects_path %>

对于在视图上显示project:name，project.find解析，我找到了该Album.take，它可以在同一视图上显示Album:name

Obs:take方法检索记录时没有任何隐式排序。

---

Obs2:显示视图保持不变。

在

创建

操作中，需要执行以下操作：

def create
 @project = Project.new project_params
 # Don't need to create dependent objects

 respond_to do |format|
    if @project.save
      ...

您不需要单独创建

相册

；所有其他代码看起来都应该可以工作。如果没有，您将需要从您的表单中发布提交的参数（我可以向其中写入更新）

--

更新

要在视图中显示相册，只需调用关联方法：

#app/controllers/projects_controller.rb
def show
   @project = Project.find params[:id]
end

#app/views/projects/show.html.erb
<% @project.albums.each do |album| %>
   <%= album.title %>
<% end %>

#app/controllers/projects_controller.rb
def秀
@project=project.find参数[：id]
结束
#app/views/projects/show.html.erb

您是否已更新控制器以允许您修改project中的相册属性？您是指project\u控制器上的白名单参数？params.require（：project）.permit（：name，相册属性：[：name]）应该是

@project=project.new（project\u params）

：）半途而废，插入了项目名称，但相册名称仍然为空。好的，你能给我们看看从表单发送的参数吗？我的项目表单在上面，我在表单中发送project:name，在表单中发送fields\u，但我需要查看表单提交的内容。要获得它，您只需在单击“提交”时复制控制台上发送的请求-它将向我们显示从表单发送的参数和值，这将使我们能够看到哪里可能出错

<p id="notice"><%= notice %></p>

<p>
  <strong>Project Name:</strong>
  <%= @project.name %>
</p>

<p>
  <strong>Album Name:</strong>
  <%= @project.album.name %>
</p>



<%= link_to 'Edit', edit_project_path(@project) %> |
<%= link_to 'Back', projects_path %>

  def show
    @project = Project.find(params[:id])
    @album = Album.take
  end

  def create
    @project = Project.new(project_params)
  end 

def create
 @project = Project.new project_params
 # Don't need to create dependent objects

 respond_to do |format|
    if @project.save
      ...

#app/controllers/projects_controller.rb
def show
   @project = Project.find params[:id]
end

#app/views/projects/show.html.erb
<% @project.albums.each do |album| %>
   <%= album.title %>
<% end %>