Question

我试图为我的工作类构建一个范围，如下所示：

 class Job < ActiveRecord::Base
   has_many :comments
   scope :most_recent, -> {order("created_at_DESC")}
   validates_presence_of :description, :title
 end

但我一直收到这个错误：

ActiveRecord::StatementInvalid in Jobs#premium
Showing c:/Users/Suporte 2/classificado/job_board/app/views/jobs/premium.html.erb where line #3 raised:

SQLite3::SQLException: no such column: created_at_DESC: SELECT "jobs".* FROM "jobs"  WHERE "jobs"."premium" = 't'  ORDER BY created_at_DESC
Extracted source (around line #3):
1
2
3
4
5
6

  <h1>Premium jobs</h1>

  <%= render @jobs %>

  <br>


Rails.root: c:/Users/Suporte 2/classificado/job_board

Application Trace | Framework Trace | Full Trace
app/views/jobs/premium.html.erb:3:in `_app_views_jobs_premium_html_erb__296098893_30761424'

这是我在jobs_controller.rb的索引函数：

def premium
  @jobs = Job.where(premium: true).all.most_recent
end

我的premium.html.erb档案：

 <h1>Premium jobs</h1>

 <%= render @jobs %>

 <br>

 <%= link_to 'New Job', new_job_path %>
 <br>

 <%= link_to 'Hello World', hello_world_path %>
 <%= link_to 'All Jobs', jobs_path %>

我使用的是rails 4.1.4版，有人可以帮帮我吗？

Answer 1

SQLite3 :: SQLException：没有这样的列：created_at_DESC

您的工作模式中的这一行

scope :most_recent, -> {order("created_at_DESC")}

应该是

scope :most_recent, -> {order("created_at DESC")}

不能在轨道上的红宝石上使用范围4.1.4

1 个答案: