标签: ruby-on-rails-5

当我意识到你应该在视图中使用帮助器时,我需要一个帮助器在我的控制器中,因为我正在构建一个JSON对象来返回.

它有点像这样:

def xxxxx

   @comments = Array.new

   @c_comments.each do |comment|
   @comments << {
     :id => comment.id,
     :content => html_format(comment.content)
   }
   end

   render :json => @comments
end

我怎样才能访问我的html_format助手？

我已将我的一个应用程序从Rails 4.2.6升级到Rails 5.0.0.该升级指南说,是自动加载功能在生产中默认情况下禁用现在.

现在我总是在生产服务器上出错,因为我在application.rb文件中加载了所有带有自动加载的lib 文件.

module MyApp
    class Application < Rails::Application
        config.autoload_paths += %W( lib/ )
    end
end

现在,我已经设定了config.enable_dependency_loading,true但我想知道是否有更好的解决方案.必须有一个原因,默认情况下在生产中禁用自动加载.

你如何or在Rails 5 ActiveRecord中进行查询？此外,是否有可能链or与where在ActiveRecord的查询？

这个代码在rails 5中

class PagesController < ApplicationController
  def action
    render nothing: true
  end
end

导致以下弃用警告

DEPRECATION WARNING: :nothing` option is deprecated and will be removed in Rails 5.1. Use `head` method to respond with empty response body.

我该如何解决？

我正在使用Rails 5

我在模型用户中添加了新的字段用户名.

class Users::RegistrationsController < Devise::RegistrationsController
  before_action :configure_permitted_parameters

  protected

  def configure_permitted_parameters
    devise_parameter_sanitizer.for(:sign_up).push(:username)  
  end
end

在注册期间显示错误:未定义的方法`for'for#您的意思是？叉子

跟踪:

NoMethodError(未定义的方法`为'for#你的意思是？fork):

app/controllers/users/registrations_controller.rb:7:in `configure_permitted_parameters'
  Rendering /usr/local/rvm/gems/ruby-2.3.0/gems/actionpack-5.0.0.rc1/lib/action_dispatch/middleware/templates/rescues/diagnostics.html.erb within rescues/layout
  Rendering /usr/local/rvm/gems/ruby-2.3.0/gems/actionpack-5.0.0.rc1/lib/action_dispatch/middleware/templates/rescues/_source.html.erb
  Rendered /usr/local/rvm/gems/ruby-2.3.0/gems/actionpack-5.0.0.rc1/lib/action_dispatch/middleware/templates/rescues/_source.html.erb (5.0ms)
  Rendering /usr/local/rvm/gems/ruby-2.3.0/gems/actionpack-5.0.0.rc1/lib/action_dispatch/middleware/templates/rescues/_trace.html.erb
  Rendered /usr/local/rvm/gems/ruby-2.3.0/gems/actionpack-5.0.0.rc1/lib/action_dispatch/middleware/templates/rescues/_trace.html.erb (2.9ms)
  Rendering /usr/local/rvm/gems/ruby-2.3.0/gems/actionpack-5.0.0.rc1/lib/action_dispatch/middleware/templates/rescues/_request_and_response.html.erb
  Rendered /usr/local/rvm/gems/ruby-2.3.0/gems/actionpack-5.0.0.rc1/lib/action_dispatch/middleware/templates/rescues/_request_and_response.html.erb (1.2ms)
  Rendered /usr/local/rvm/gems/ruby-2.3.0/gems/actionpack-5.0.0.rc1/lib/action_dispatch/middleware/templates/rescues/diagnostics.html.erb within rescues/layout (118.1ms)

谁可以帮忙？怎么解决这个问题？

我试图找到一些解决方案,但我真的找不到与运行rails命令时出现的错误相关的任何内容:

rails generate model书名:string summary:text isbn:string

/home/vmu/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/activesupport-5.0.1/lib/active_support/xml_mini.rb:51: warning: constant ::Fixnum is deprecated
/home/vmu/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/activesupport-5.0.1/lib/active_support/xml_mini.rb:52: warning: constant ::Bignum is deprecated
/home/vmu/.rbenv/versions/2.4.0/lib/ruby/gems/2.4.0/gems/activesupport-5.0.1/lib/active_support/core_ext/numeric/conversions.rb:138: warning: constant ::Fixnum is deprecated
Running via Spring preloader in process 3579
Expected string default value for '--jbuilder'; got true (boolean)
      invoke  active_record
   identical    db/migrate/20170104114702_create_books.rb
   identical    app/models/book.rb
      invoke    test_unit
   identical      test/models/book_test.rb
   identical      test/fixtures/books.yml

有谁知道可能导致这些错误的原因？

Turbolinks可防止正常$(document).ready()事件在初始加载之外的所有页面访问时触发,如此处和此处所述.但是,链接答案中的所有解决方案都不适用于Rails 5.如何像以前的版本一样在每次访问页面上运行代码？

我知道有三个主要的符号为whereActiveRecord方法提供参数:

1. 纯字符串
2. 排列
3. 哈希

指定and的where方法是直截了当:

# Pure String notation
Person.where("name = 'Neil' AND age = 27")

# Array notation
Person.where(["name = ? AND age = ?", 'Neil', 27])

# Hash notation
Person.where({name: "Neil", age: 27})

or为这个相同的where方法指定是为了哈希语法.可能吗？

# Pure String notation
Person.where("name = 'Neil' OR age = 27")

# Array notation
Person.where(["name = ? OR age = ?", 'Neil', 27])

# Hash notation DOESN'T WORK
Person.where({name: "Neil" OR age: 27})

我是铁杆新手.我注意到在rails 5中生成数据迁移时,有些人会使用rails db:migrate它rake db:migrate.有人可以解释数据库迁移中rails vs rake命令之间的区别吗？是否意味着rake命令在rails 5中已经过时了？

非常感谢

我有简单的动作节目

def show
  @field = Field.find_by(params[:id])
end

我想要写它的规格

require 'spec_helper'

RSpec.describe FieldsController, type: :controller do

    let(:field) { create(:field) }

  it 'should show field' do
    get :show, id: field
    expect(response.status).to eq(200)
  end
end

但我有一个错误

Failure/Error: get :show, id: field

 ArgumentError:
   unknown keyword: id

怎么解决？