小编Nei*_*eil的帖子

实现一个JQuery进度条,这样当你向下滚动时,它应该在顶部显示一个绿色条.当我开始滚动时,进度条不会出现.我在条形图上检查元素它显示的宽度%向上看截图

scroll.js

$(document).on('scroll', function() {

  var pixelsFromTop = $(document).scrollTop()

  var documentHeight = $(document).height()
  var windowHeight = $(window).height()

  var difference = documentHeight - windowHeight

  var percentage = 100 * pixelsFromTop / difference

  $('.bar').css('width', percentage + '%')

})

show.html.erb

<div class="progress">
   <div class="bar"></div>
</div>

<section class="day">

    <h2><%= "To make #{number_to_currency @product.revenue}" %></h2>
    <p class="lead"><%= "You need to make #{number_to_currency @product.monthly_amount} a month" %><br/>
    <%= "You need to make #{number_to_currency @product.daily_amount} a day" %></p>
</section>


<section class="people"> 

    <h2>Or if you create and sell …

我正在尝试使用paperclip,aws-sdk gem和Amazon S3创建一个图像上传器.我收到此错误:

Aws::Errors::MissingRegionError in ProjectsController#create. 
Missing region; use :region option or export region name to ENV['AWS_REGION']. using Oregon region. 

projects_controller.rb

def create
    @project = current_user.projects.new(project_params)
    @project.save
    respond_with(@project)
end

application.rb文件

config.paperclip_defaults = {
        storage: :s3,
        s3_host_name: "s3-us-west-2.amazonaws.com",
        s3_credentials: {
            bucket: ENV['AWS_BUCKET'],
            access_key_id: ENV['AWS_ACCESS_KEY_ID'],
            secret_access_key: ENV['AWS_SECRET_ACCESS_KEY']
        }
    }

根据S3文档我理解我需要更改为ENV ['AWS_REGION']

config.paperclip_defaults = {
        storage: :s3,
            region: "ENV['AWS_REGION"],
        s3_credentials: {
            bucket: ENV['AWS_BUCKET'],
            access_key_id: ENV['AWS_ACCESS_KEY_ID'],
            secret_access_key: ENV['AWS_SECRET_ACCESS_KEY']
        }
    }

并将区域添加到我的.env文件中

export AWS_BUCKET=realv1
export AWS_ACCESS_KEY_ID=<MY_ACCESS_KEY_ID_HERE>
export AWS_SECRET_ACCESS_KEY=<MY_ACCESS_KEY_HERE>
export AWS_REGION="'us-west-2'

我重新启动了服务器并重新测试但仍然得到相同的错误.

更新

更新:

在rails控制台中

2.0.0p247:001> …

创建了一个简单的 rake 任务来查找在美国出售的自行车。当我想提取标题详细信息但当我添加其他参数（如位置、价格等）并将其保存到帖子数据库时，它会出现错误 Can't cast Hash to string

Neils-MacBook-Pro-2:bike_scraper neilpatel$ rake scraper:scrape
rake aborted!
TypeError: can't cast Hash to string
/usr/local/rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.1.7/lib/active_record/connection_adapters/abstract/quoting.rb:76:in `type_cast'
/usr/local/rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.1.7/lib/active_record/connection_adapters/sqlite3_adapter.rb:261:in `type_cast'
/usr/local/rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.1.7/lib/active_record/connection_adapters/sqlite3_adapter.rb:295:in `block in exec_query'
/usr/local/rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.1.7/lib/active_record/connection_adapters/sqlite3_adapter.rb:294:in `map'
/usr/local/rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.1.7/lib/active_record/connection_adapters/sqlite3_adapter.rb:294:in `exec_query'
/usr/local/rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.1.7/lib/active_record/connection_adapters/abstract/database_statements.rb:68:in `exec_insert'
/usr/local/rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.1.7/lib/active_record/connection_adapters/abstract/database_statements.rb:95:in `insert'
/usr/local/rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.1.7/lib/active_record/connection_adapters/abstract/query_cache.rb:14:in `insert'
/usr/local/rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.1.7/lib/active_record/relation.rb:64:in `insert'
/usr/local/rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.1.7/lib/active_record/persistence.rb:503:in `_create_record'
/usr/local/rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.1.7/lib/active_record/attribute_methods/dirty.rb:87:in `_create_record'
/usr/local/rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.1.7/lib/active_record/callbacks.rb:306:in `block in _create_record'
/usr/local/rvm/gems/ruby-2.0.0-p247/gems/activesupport-4.1.7/lib/active_support/callbacks.rb:82:in `run_callbacks'
/usr/local/rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.1.7/lib/active_record/callbacks.rb:306:in `_create_record'
/usr/local/rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.1.7/lib/active_record/timestamp.rb:57:in `_create_record'
/usr/local/rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.1.7/lib/active_record/persistence.rb:483:in `create_or_update'
/usr/local/rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.1.7/lib/active_record/callbacks.rb:302:in `block in create_or_update'
/usr/local/rvm/gems/ruby-2.0.0-p247/gems/activesupport-4.1.7/lib/active_support/callbacks.rb:82:in `run_callbacks'
/usr/local/rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.1.7/lib/active_record/callbacks.rb:302:in `create_or_update'
/usr/local/rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.1.7/lib/active_record/persistence.rb:103:in `save'
/usr/local/rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.1.7/lib/active_record/validations.rb:51:in `save'
/usr/local/rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.1.7/lib/active_record/attribute_methods/dirty.rb:21:in `save'
/usr/local/rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.1.7/lib/active_record/transactions.rb:268:in `block (2 levels) in save'
/usr/local/rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.1.7/lib/active_record/transactions.rb:329:in `block in with_transaction_returning_status' …

我有一个网络应用程序,允许他们在列表表单中添加网站URL,例如www.google.com,所以在显示页面上任何人都可以点击这个并访问网页www.google.com

尝试了一些事情link_to等,但似乎无法让它正常工作

listings.form

<div class="form-group">
    <%= f.label "Tell Us About Your Business 25-30 chars max" %>
    <%= f.text_area :about, class: "form-control" %>
  </div>

  <div class="form-group">
    <%= f.label "Company Website" %>
    <%= f.text_field :url , class: "form-control", placeholder: "E.g www.google.com"  %>
  </div>

show.html.erb

 <div class="blog-header">
        <h1 class="blog-title"><%= @listing.job %></h1>
        <p class="lead blog-description"><b>Posted on</b> <%= @listing.created_at.strftime("%B %-d, %Y") %></p>
        <h4><%= @listing.company %></h4>
        <h4><%= @listing.location %></h4>
        ***<h4><%= link_to @listing.url %></h4>*** 
      </div>

所以目前它创建了一个链接,但没有进入网页.

更新的代码

<div class="blog-header">
        <h1 class="blog-title"><%= @listing.job %></h1>
        <p class="lead blog-description"><b>Posted on</b> …

构建一个 Rails 网络刮板应用程序，该应用程序将根据英国邮政编码（例如：EC2A 4BX）返回当前的水供应商。创建了一个初始化文件，它在本地主机上工作，但在 Heroku 上我得到错误。 NameError: 未初始化的常量 Net

Preparing app for Rails asset pipeline
remote:        Running: rake assets:precompile
remote:        rake aborted!
remote:        NameError: uninitialized constant Net
remote:        /tmp/build_b54ea2f35a53dd4aa97f18e85d315c40/config/initializers/thameswater.rb:10:in `<top (required)>'
remote:        /tmp/build_b54ea2f35a53dd4aa97f18e85d315c40/vendor/bundle/ruby/2.0.0/gems/railties-4.1.7/lib/rails/engine.rb:648:in `block in load_config_initializer'
remote:        /tmp/build_b54ea2f35a53dd4aa97f18e85d315c40/vendor/bundle/ruby/2.0.0/gems/activesupport-4.1.7/lib/active_support/notifications.rb:161:in `instrument'
remote:        /tmp/build_b54ea2f35a53dd4aa97f18e85d315c40/vendor/bundle/ruby/2.0.0/gems/railties-4.1.7/lib/rails/engine.rb:647:in `load_config_initializer'
remote:        /tmp/build_b54ea2f35a53dd4aa97f18e85d315c40/vendor/bundle/ruby/2.0.0/gems/railties-4.1.7/lib/rails/engine.rb:612:in `block (2 levels) in <class:Engine>'
remote:        /tmp/build_b54ea2f35a53dd4aa97f18e85d315c40/vendor/bundle/ruby/2.0.0/gems/railties-4.1.7/lib/rails/engine.rb:611:in `each'
remote:        /tmp/build_b54ea2f35a53dd4aa97f18e85d315c40/vendor/bundle/ruby/2.0.0/gems/railties-4.1.7/lib/rails/engine.rb:611:in `block in <class:Engine>'
remote:        /tmp/build_b54ea2f35a53dd4aa97f18e85d315c40/vendor/bundle/ruby/2.0.0/gems/railties-4.1.7/lib/rails/initializable.rb:30:in `instance_exec'
remote:        /tmp/build_b54ea2f35a53dd4aa97f18e85d315c40/vendor/bundle/ruby/2.0.0/gems/railties-4.1.7/lib/rails/initializable.rb:30:in `run'
remote:        /tmp/build_b54ea2f35a53dd4aa97f18e85d315c40/vendor/bundle/ruby/2.0.0/gems/railties-4.1.7/lib/rails/initializable.rb:55:in `block in run_initializers'
remote:        /tmp/build_b54ea2f35a53dd4aa97f18e85d315c40/vendor/bundle/ruby/2.0.0/gems/railties-4.1.7/lib/rails/initializable.rb:44:in `each'
remote:        /tmp/build_b54ea2f35a53dd4aa97f18e85d315c40/vendor/bundle/ruby/2.0.0/gems/railties-4.1.7/lib/rails/initializable.rb:44:in `tsort_each_child'
remote:        /tmp/build_b54ea2f35a53dd4aa97f18e85d315c40/vendor/bundle/ruby/2.0.0/gems/railties-4.1.7/lib/rails/initializable.rb:54:in `run_initializers'
remote:        /tmp/build_b54ea2f35a53dd4aa97f18e85d315c40/vendor/bundle/ruby/2.0.0/gems/railties-4.1.7/lib/rails/application.rb:300:in `initialize!' …