小编Ami*_*rma的帖子

每次我更改控制器或模型中的任何内容时,我都必须重新启动服务器才能使其生效.但情况并非总是如此,以前它曾经正常工作,当我改变了什么,但我不知道现在发生什么事 ？

我的Rails版本是3.2.11

在我的开发环境文件中,我设置了config.cache_classes = false.

请帮忙..

我的development.rb文件如下

Testapp::Application.configure do
  # Settings specified here will take precedence over those in config/application.rb

  # In the development environment your application's code is reloaded on
  # every request. This slows down response time but is perfect for development
  # since you don't have to restart the web server when you make code changes.
  config.cache_classes = false

  # Log error messages when you accidentally call methods on nil.
  config.whiny_nils = true

  # …

我正在创建一个示例项目,但是当我尝试创建一个新帖子时收到错误"未定义的方法为nil类创建"

我的代码如下.

user.rb

class User < ActiveRecord::Base
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable
  has_one :post, dependent: :destroy
end

post.rb

class Post < ActiveRecord::Base
  belongs_to :user
end

posts_controller.rb

class PostsController < ApplicationController
  def create
    @user = current_user
    if @user.post.blank?
      @post = @user.post.create(params[:post].permit(:title, :text))
    end
    redirect_to user_root_path
  end
end

new.html.erb

<%= form_for([current_user, current_user.build_post]) do |f| %>
  <p>
    <%= f.label :title %><br>
    <%= f.text_field :title %>
  </p>

  <p>
    <%= f.label :text %><br>
    <%= f.text_area :text %>
  </p>

  <p>
    <%= f.submit %> …

我想使用 Ruby 从给定的数组中生成最大的数字。

示例 1

## Input
my_array = %w{8 40 9}

## Expected Output
"9840"

示例 2

## Input
my_array = %w{9 8 40 9}

## Expected Output
"99840"