Question

我有以下rake任务自动生成每日帖子，或者如果用户没有帖子，它会自动生成所有帖子追溯到他们的开始日期：

namespace :abc do
desc "Used to generate a new daily log"
task :create_post => :environment do

User.find_each do |currentUser|
  starting_date = currentUser.start_date
  if Date.today >= starting_date && Date.today.on_weekday?
    if currentUser.posts.count.zero?
      starting_date.upto(Date.today) { |date| currentUser.generate_post if date.on_weekday? }
    else
      currentUser.generate_post
    end
  end
end
puts "It actually worked yo!"
end
end

我试图通过＆＃39; upto＆＃39;来实现追溯性的帖子生成。然而，当我运行代码时，我得到以下错误：

NoMethodError: undefined method `upto' for Tue, 09 May 2017 21:42:54 UTC +00:00:Time
C:/Users/vanbeeandr/workspace/online_journal/lib/tasks/create_post.rake:14:in `block (3 levels) in <top (required)>'
 C:/Users/vanbeeandr/workspace/online_journal/lib/tasks/create_post.rake:7:in `block (2 levels) in <top (required)>'
   NoMethodError: undefined method `upto' for 2017-05-09 21:42:54 UTC:Time
C:/Users/vanbeeandr/workspace/online_journal/lib/tasks/create_post.rake:14:in `block (3 levels) in <top (required)>'
 C:/Users/vanbeeandr/workspace/online_journal/lib/tasks/create_post.rake:7:in `block (2 levels) in <top (required)>'
  Tasks: TOP => abc:create_post
  (See full trace by running task with --trace)

我觉得我的rake任务写得正确所以我不确定为什么会抛出这个错误。任何人都可以帮忙吗？

Answer 1

实际上，错误表明start_date是Time个实例。 Ruby / Rails只允许遍历Date和DateTime的实例（参见Iterate over Ruby Time object with delta）。

Answer 2

我通过在上面的代码中添加.to_datetime来解决这个问题，如下所示：

starting_date = currentUser.start_date.to_datetime

使用Ruby on Rails＆＃39; upto＆＃39; Rake任务中的方法

2 个答案: