小编Mez*_*bah的帖子

我尝试编写一个图像验证格式,确保url以.png,.jpg或.gif结尾.

class Product < ActiveRecord::Base

  mount_uploader :image_url

  validates :title, :presence => true,
            :uniqueness => true
  validates :image_url, :presence => true,
                        :format => {
                           :with => %r{\.(gif|jpg|png)$}i,
                           :message => 'must be a URL for GIF, JPG or PNG image.'
                        }
end

但是,当我启动我的服务器.看到这个:

提供的正则表达式使用多行锚点(^或$),这可能会带来安全风险.你的意思是使用\ A和\ z,还是忘了添加:multiline => true选项？

在我的ruby on rails项目中,我使用capistrano,unicorn,postgresql和nginx来部署我的项目.当我运行时,cap production git:check 我收到此错误:

Error reading response length from authentication socket.

日志跟踪:

INFO [13522bc0] Running /usr/bin/env mkdir -p /tmp/deploy_test/ as mezbah@192.168.137.130
DEBUG [13522bc0] Command: /usr/bin/env mkdir -p /tmp/deploy_test/
INFO [13522bc0] Finished in 0.291 seconds with exit status 0 (successful).
DEBUG Uploading /tmp/deploy_test/git-ssh.sh 0.0%
INFO Uploading /tmp/deploy_test/git-ssh.sh 100.0%
INFO [3b379ef0] Running /usr/bin/env chmod +x /tmp/deploy_test/git-ssh.sh as mezbah@192.168.137.130
DEBUG [3b379ef0] Command: /usr/bin/env chmod +x /tmp/deploy_test/git-ssh.sh
INFO [3b379ef0] Finished in 0.067 seconds with exit status 0 (successful).
INFO [8355617a] Running …

找不到文件'jquery.ui.datepicker'(在C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/bundler/gems/active_admin-f65e7cd6425b/app/assets/javascripts/active_admin/base .js.coffee:2)

认为gem'sprockets'的问题

sprockets (2.11.0) lib/sprockets/context.rb:106:in `resolve'
sprockets (2.11.0) lib/sprockets/context.rb:146:in `require_asset'
sprockets (2.11.0) lib/sprockets/directive_processor.rb:217:in `process_require_directive'
sprockets (2.11.0) lib/sprockets/directive_processor.rb:167:in `block in process_directives'
sprockets (2.11.0) lib/sprockets/directive_processor.rb:165:in `each'
sprockets (2.11.0) lib/sprockets/directive_processor.rb:165:in `process_directives'
sprockets (2.11.0) lib/sprockets/directive_processor.rb:99:in `evaluate'
tilt (1.4.1) lib/tilt/template.rb:103:in `render'
sprockets (2.11.0) lib/sprockets/context.rb:197:in `block in evaluate'
sprockets (2.11.0) lib/sprockets/context.rb:194:in `each'
sprockets (2.11.0) lib/sprockets/context.rb:194:in `evaluate'
sprockets (2.11.0) lib/sprockets/processed_asset.rb:12:in `initialize'
sprockets (2.11.0) lib/sprockets/base.rb:374:in `new'
sprockets (2.11.0) lib/sprockets/base.rb:374:in `block in build_asset'
sprockets (2.11.0) lib/sprockets/base.rb:395:in `circular_call_protection'
sprockets (2.11.0) lib/sprockets/base.rb:373:in `build_asset'
sprockets (2.11.0) lib/sprockets/index.rb:94:in `block in build_asset'
sprockets …

查看 rails guide 4 guides.rubyonrails.org/v4.0.6/form_helpers.html 后。我正在尝试上传没有任何 gem 的图像，但是当点击创建按钮时，我的图片字段为空。

这是我的控制器：

class ImagesController < ApplicationController
  before_action :set_image, only: [:show, :edit,:upload, :update, :destroy]

  # GET /images
  # GET /images.json
  def index
    @images = Image.all
  end

  # GET /images/1
  # GET /images/1.json
  def show
  end

  # GET /images/new
  def new
    @image = Image.new
  end

  # GET /images/1/edit
  def edit
  end

  # POST /images
  # POST /images.json
  def create
    @image = Image.new(image_params)
    if params[:image].present?
      file = params[:image][:picture]
      File.open(Rails.root.join('app','assets', 'images', file.original_filename), 'wb') do |f|
        f.write(file.read) …

我在osx yosemite 10.10.1中安装rails时遇到此错误

 mezbah$ gem install rails --no-ri --no-rdoc
    ERROR:  Error installing rails:
        invalid gem: package is corrupt, exception while verifying: undefined method `size' for nil:NilClass (NoMethodError) in /Users/mezbah/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/cache/nokogiri-1.6.6.2.gem
 mezbah$ gem install nokogiri
       ERROR:  Error installing nokogiri:
            invalid gem: package is corrupt, exception while verifying: undefined method `size' for nil:NilClass (NoMethodError) in /Users/mezbah/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/cache/nokogiri-1.6.6.2.gem

任何的想法？？

为什么我看到这个警告？

me = { 'name' => 'mezbah'}
me.index('mezbah') # => warning: Hash#index is deprecated; use Hash#key