Question

我收到以下错误

PostsController中的UnknownAttributeError #new

未知属性：company_id

发布控制器

def new
    @company = Company.find(params[:company_id])
    @post = @company.posts.build
end

def create
    @company = Company.find(params[:company_id])
    @post = @company.posts.build(post_params)

    if @post.save
        redirect_to @post
    else
        render 'new'
    end
end

private

def post_params
 params.require(:post).permit(:title, :summary, :body)
end

路线

resources :companies do 
 resources :posts
end

模型

class Post < ActiveRecord::Base
 belongs_to :company
end

class Company < ActiveRecord::Base
 belongs_to :user, dependent: :destroy
 has_many :posts
end

形式

<%= form_for (@post) do |f| %>
  <div class="form-group">
    <%= f.label :Post_Title %>
    <%= f.text_field :title, class: "form-control", placeholder: "Post Title" %>
  </div>
  <div class="form-group">
    <%= f.label :Post_Summary %>
    <%= f.text_area :summary, class: "form-control", placeholder: "Post Summary" %>
  </div>
  <div class="form-group">
    <%= f.label :Post_Post %>
    <%= f.text_area :body, class: "form-control", placeholder: "The Post" %>
  </div>
  <div class="form-group">
    <%= f.submit :Submit, class: "btn btn-success" %>
  </div>
<% end %>

我希望每个帖子都属于公司，帖子的表格中包含属性company_id。我无法弄清楚为什么这不起作用。

Answer 1

在company_id中添加post_params，

<强> posts_controller.rb

private

def post_params
 params.require(:post).permit(:title, :summary, :body, :company_id)
end

在表单中添加company_id

<%= form_for (@post) do |f| %>
  <div class="form-group">
    <%= f.label :Post_Title %>
    <%= f.text_field :title, class: "form-control", placeholder: "Post Title" %>
  </div>
  <div class="form-group">
    <%= f.label :Post_Summary %>
    <%= f.text_area :summary, class: "form-control", placeholder: "Post Summary" %>
  </div>
  <div class="form-group">
    <%= f.label :Post_Post %>
    <%= f.text_area :body, class: "form-control", placeholder: "The Post" %>
  </div>

  <%= hidden_field_tag 'company_id', @company.id %>

  <div class="form-group">
    <%= f.submit :Submit, class: "btn btn-success" %>
  </div>
<% end %>

Answer 2

当您嵌套资源时，您将最终破坏路线中的许多默认路径。通常，这只是将posts_path更新为company_posts_path(@company)的简单修复方法。

如果是此表单，则form_for会将您发送到旧的posts#new，而不是新嵌套的resources :posts。我会继续猜测你在你发布的嵌套资源之外的路线中仍然有form_for(@post)。

要解决此问题，您需要将form_for([@company, @post])的路径更改为@post。这样，表单就会知道会将您发送到@company内嵌套的{{1}}表单。

rails 4新动作未知属性错误

2 个答案: