无法将project_id设置为嵌套路由中的数据库

Question

我已经创建了一个与职责一对多关联的项目脚手架。我可以呈现责任表单，但我不能将project_id设置为责任表。我已经创建了一对多关联。

这是我的代码-

routes.rb

  resources :projects do
    resources :responsibilities
  end

责任form.html.erb

<%= form_with(model: responsibility, url: [@project, responsibility], local: true) do |form| %>
  <% if responsibility.errors.any? %>
    <div id="error_explanation">
      <h2><%= pluralize(responsibility.errors.count, "error") %> prohibited this responsibility from being saved:</h2>

      <ul>
      <% responsibility.errors.full_messages.each do |message| %>
        <li><%= message %></li>
      <% end %>
      </ul>
    </div>
  <% end %>

  <div class="field">
    <%= form.label :responsibility_matrix %>
    <%= form.text_field :responsibility_matrix %>
  </div>

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

responsibilities_controller.rb

  def new
    @project = Project.find(params[:project_id])
    @responsibility = Responsibility.new
  end

Answer 1

循序渐进

新应用

rails new bookstore

添加脚手架作者

rails g scaffold author name

添加脚手架书籍

rails g scaffold book name author:references

更新路由

从…

resources :books
resources :authors

至

resources :authors  do
    resources :books
end

让我们在app/views/authors/show.html.erb中显示新书链接，添加

<%= link_to 'New book', new_author_book_path(@author) %> |

在创建了第一个作者并访问了http://localhost:3000/authors/1/books/new之后，我们有了一个错误: Books#new中的NoMethodError

undefined method `books_path'

要进行修复，请首先在BooksController中添加

before_action :set_author, only: [:new]

private
def set_author
  @author = Author.find(params[:author_id])
end

在app/views/book/_form.html.erb中

<%= form_with(model: book, url:[@author, book], local: true) do |form| %>

再次访问http://localhost:3000/authors/1/books/new

Books#new中的NameError

undefined local variable or method `books_path'

修复app/views/book/new.html.erb

变化

<%= link_to 'Back', books_path %>

至

<%= link_to 'Back', author_books_path(@author) %>

现在我们可以呈现http://localhost:3000/authors/1/books/new了

我想你在这里得到了你需要的一切