Rails：.destroy错误的参数数量（0表示1）

My error message is "wrong number of arguments (0 for 1)"

我的错误消息是“错误的参数数量(0表示1)”

for this line: @post = Post.destroy in my

对于这一行:@post = Post.destroy in my

PostsController#destroy

I have a model which is post.rb

我有一个post.rb的模型

My Posts Controller is here

我的帖子控制器在这里

class PostsController < ApplicationController
  def new
    @post = Post.new
  end

  def index
    @posts = Post.all
  end

  def create
    @post = Post.new(post_params)

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

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

  def show
    @post = Post.find(params[:id])
  end  

  def edit
    @post = Post.find(params[:id])
  end

  def update
    @post = Post.find(params[:id])

    if @post.update(params[:post].permit(:title, :text))
      redirect_to @post
    else
      render 'edit'
    end
  end

  def destroy
    @post = Post.find(params[:id])
    @post = Post.destroy

    redirect_to posts_path
  end

end

In my view I have this code:

在我看来,我有这个代码:

<%= link_to 'Destroy', post_path(post),
  method: :delete, data: { confirm: 'Are you sure?' } %>

This is what it says I have for the parameters in the request

这就是我对请求中的参数所说的内容

{"_method"=>"delete",
 "authenticity_token"=>"Pzsnxv8pt+34KIKpYqfZquDv3UpihkINGSJxomMNsW4=",
 "id"=>"3"}

What in the heck am I doing wrong??

我做错了什么?

4 个解决方案

#1

You need to provide the ID to the destroy method:

您需要为destroy方法提供ID:

Post.destroy(params[:id])

As stated here: http://api.rubyonrails.org/classes/ActiveRecord/Relation.html#method-i-destroy

如上所述:http://api.rubyonrails.org/classes/ActiveRecord/Relation.html#method-i-destroy

#2

Here is your problem:

这是你的问题:

@post = Post.destroy

In Ruby you can destroy object in this way:

在Ruby中,您可以通过以下方式销毁对象:

@post.destroy

Another tip: when you are using variables just inside model or controller, declare them as locals by not adding @ in front of them and use @ just for variables that you need to use globally. Learn more about that here: In what circumstances should I use instance variables instead of other variable types?

另一个提示:当你在模型或控制器中使用变量时,通过不在它们前面添加@来将它们声明为locals,并将@ just用于需要全局使用的变量。在此处了解更多信息:在什么情况下我应该使用实例变量而不是其他变量类型?

#3

Precisely what the error says.

确切地说,错误是什么。

You can:

Call destroy on an instance with no argument, e.g., @post.destroy

在没有参数的实例上调用destroy,例如@ post.destroy

On the class with an id, e.g., Post.destroy(an_id)

在具有id的类上,例如Post.destroy(an_id)

#4

I guess you wish to write:

我想你想写:

@post.destroy

#1