[英]Using ActiveRecord::Base.transaction in a rake task?
I am writing a rake task which, at one point, uses a custom YAML file import method to seed the database. 我正在编写一个rake任务,该任务有时使用一种自定义的YAML文件导入方法来播种数据库。
The rake task looks like: 耙任务看起来像:
desc "Seed the database with production/ data."
task :production => :environment do
import_yaml 'seed/production'
end
At one point in the import code, I have: 在导入代码的某一点上,我有:
ActiveRecord::Base.transaction do
Trying to run the rake task throws: 尝试运行rake任务时抛出:
You have a nil object when you didn't expect it!
You might have expected an instance of ActiveRecord::Base.
The error occurred while evaluating nil.[]
The stack trace points to the aforementioned line in the code. 堆栈跟踪指向代码中的上述行。
Is there a way to instantiate ActiveRecord::Base during a rake task? 有没有办法在瑞克任务期间实例化ActiveRecord :: Base?
Thanks! 谢谢!
maybe you have not included the 'environment' in the rake task? 也许您没有在rake任务中包含“环境”?
rake task can't access rails.cache 耙任务无法访问rails.cache
task (:my_rake_task => :environment) do
# ....
end
without the => :environment you will not have access to any of your rails app models 没有=>:environment,您将无法访问任何Rails应用程序模型
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