标签: ruby-on-rails-4

filters = {
  "start_year" => "2009",
  "end_year" => "2011",
  "theme" => "",
  "discipline" => ""
}

filters.length是的4,但我想得到2(那些不仅有钥匙,还有价值的人)

长话短说,因为我浪费了足够的时间与这个愚蠢的框架.我想使用纯CSS,没有SCSS,没有css.erb,没有mumbo-jumpo,它增加了更多的开销解析,即使它超过2ms.

我的production.rb文件有(我正在使用webrick):

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

  # Code is not reloaded between requests.
  config.cache_classes = true

  # Eager load code on boot. This eager loads most of Rails and
  # your application in memory, allowing both thread web servers
  # and those relying on copy on write to perform better.
  # Rake tasks automatically ignore this option for performance.
  config.eager_load = true

  # Full error reports are disabled and caching is …

更改我的代码！我有以下错误： PG::UndefinedColumn: 错误: 列 Students.year_course_id 不存在 第 1 行: SELECT COUNT( ) FROM "students" WHERE "students"."year_cour... ^ : SELECT COUNT( ) FROM "students " 其中“学生”."year_course_id" = $1

我有一个像这样的字符串：

str= "1,2,3,4"

我想从这个字符串中删除双引号，这样我就会得到像1,2,3,4. 请帮帮我。