深度嵌套的资源表单

Question

我正在努力让这个工作，我已经阅读了很多，但找不到这里的问题。

routes.rb

  resources :scripts do
    resources :reviews
    resources :issues do
      resources :comments
    end
  end

cmets_migration

create_table :comments do |t|
  t.integer :issue_id
  t.integer :user_id
  t.text :body

  t.timestamps
end

控制器动作

  def create
    @issue = Issue.find(params[:issue_id])
    @comment = current_user.comments.build(comment_params)
    @comment.issue_id = @issue.id

    if @comment.save
      redirect_to @comment, notice: 'Comment was successfully created.'
    else
      render :new
    end
  end

  def new
    @issue = Issue.find(params[:issue_id])
    @comment = current_user.comments.new
    @comment.issue_id = @issue.id
  end

现在在我的Issues/Show 视图中，我想添加用于添加评论的表单：

<%= form_for [@issue, @comment] do |f| %>
  <div class="field">
    <%= f.label :body %><br>
    <%= f.text_area :body %>
  </div>
  <div class="actions">
    <%= f.submit %>
  </div>
<% end %>

路线：

                          POST   /scripts/:script_id/issues/:issue_id/comments(.:format)          comments#create
 new_script_issue_comment GET    /scripts/:script_id/issues/:issue_id/comments/new(.:format)      comments#new
edit_script_issue_comment GET    /scripts/:script_id/issues/:issue_id/comments/:id/edit(.:format) comments#edit
     script_issue_comment GET    /scripts/:script_id/issues/:issue_id/comments/:id(.:format)      comments#show
                          PATCH  /scripts/:script_id/issues/:issue_id/comments/:id(.:format)      comments#update
                          PUT    /scripts/:script_id/issues/:issue_id/comments/:id(.:format)      comments#update
                          DELETE /scripts/:script_id/issues/:issue_id/comments/:id(.:format)      comments#destroy
            script_issues GET    /scripts/:script_id/issues(.:format)                             issues#index

这给了我First argument in form cannot contain nil or be empty。

虽然请求信息显示：

{"action"=>"show", "controller"=>"issues", "script_id"=>"10", "id"=>"8"}

我是否必须在 cmets 中也包含 :script_id？

我在这里错过了什么？

Answer 1

您可以使用简单的form_for 来创建评论：

form_for @issue.comments.build, url: script_issue_comments_path(params[:script_id], @issue) do |f|
  f.text_area :body
  f.submit "save"
end

Answer 2

您错过了基于new 操作而不是create 的表单。您还需要在此处声明这些变量。

Answer 3

这是因为 form_for 中的参数为零。你应该在你的表演动作中初始化它。你不需要 script_id

class IssuesController < ApplicationController
    def show
     ..
     @comment = @issue.comments.build
     ..
end

修复未定义路径错误。您将需要稍微修改 form_for。

<% @form_for @comment, url: script_issue_comments_path(@issue.script_id, @issue) do |f| %>
...
<% end %>