Rake 中模型参考上未初始化的常量错误

发布于 2024-11-18 23:49:26 字数 840 浏览 1 评论 0原文

在我的sample_data.rake 文件中，我的命令“Diner.create!(...)”会导致“未初始化的常量Diner”错误。但是，如果我在 Rails 控制台中执行相同的“Diner.create!(...)”命令，则会成功。如果我“需要”sample_data.rake 文件中的模型，则会收到错误“ActiveRecord::ConnectionNotEstablished”，回溯显示“active_record/connection_adapters/abstract/connection_pool.rb:318” ：在retrieve_connection'”中。这是我的diner.rb 文件：

class Diner < ActiveRecord::Base
  has_many  :redemptions
  has_many  :surveys, :through => :redemptions
end

导致问题的sample_data.rake 文件中的代码是：

99.times do |n|
  gender = rand(1) == 0 ? "male" : "female"
  birthdate = Date.ordinal(DateTime.now.year - 13 - rand(62), rand(364)+1)
  Diner.create!(:gender => gender, :birthdate => birthdate)
end

删除上述代码会导致文件成功处理。而且，正如我之前所说，上面的代码在 Rails 控制台中可以正常工作。

原文

In my sample_data.rake file, I have the command "Diner.create!(...)" which causes an "uninitialized constant Diner" error. However, if I execute the same "Diner.create!(...)" command in the Rails console, it is successful. If I "require" the model in the sample_data.rake file, I get the error "ActiveRecord::ConnectionNotEstablished" with the backtrace showing "active_record/connection_adapters/abstract/connection_pool.rb:318:in retrieve_connection'". Here is my diner.rb file:

class Diner < ActiveRecord::Base
  has_many  :redemptions
  has_many  :surveys, :through => :redemptions
end

And the code in the sample_data.rake file that causes the problem is:

99.times do |n|
  gender = rand(1) == 0 ? "male" : "female"
  birthdate = Date.ordinal(DateTime.now.year - 13 - rand(62), rand(364)+1)
  Diner.create!(:gender => gender, :birthdate => birthdate)
end

Removing the above code causes the file to process successfully. And, as I said earlier, the above code works correctly in rails console.

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长发绾君心 2024-11-25 23:49:26

您的 rake 任务显然缺少 Rails 环境。
如果您的任务具有以下结构并且您的模型位于 $LOAD_PATH 内，那么一切都应该没问题：

     namespace :yourapp do
         desc "Create sample data"
         task :populate => :environment do
           # create other data
           99.times do |n|
             gender = rand(1) == 0 ? "male" : "female"
             birthdate = Date.ordinal(DateTime.now.year - 13 - rand(62), rand(364)+1)
             Diner.create!(:gender => gender, :birthdate => birthdate)
           end
         end
     end

您会看到 task :populate =>; :environment do 行，它告诉 rake 启动环境任务[1]，然后执行您的任务，该任务现在可以访问您的模型和数据库

[1]railties-3.0.4/lib/rails/application .rb#214

[1]railties-3.0.4/lib/rails/application.rb#101

干杯

Your rake task is clearly missing the rails environment.
If your task has the following structure and your model is within $LOAD_PATH then everything should be fine:

     namespace :yourapp do
         desc "Create sample data"
         task :populate => :environment do
           # create other data
           99.times do |n|
             gender = rand(1) == 0 ? "male" : "female"
             birthdate = Date.ordinal(DateTime.now.year - 13 - rand(62), rand(364)+1)
             Diner.create!(:gender => gender, :birthdate => birthdate)
           end
         end
     end

You see that task :populate => :environment do line, it tells rake to fire up the environment task[1] and then perform your task which now has access to your models and the Database

[1]railties-3.0.4/lib/rails/application.rb#214

[1]railties-3.0.4/lib/rails/application.rb#101

cheers

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