有没有一种方法，以避免自动更新Rails的时间戳字段？

问题描述

如果您有DB列 created_at 和的updated_at 当您创建Rails会自动设置这些值，并更新模型目的。有没有一种方法来保存模型不接触那些列？

If you have DB columns created_at and updated_at Rails will automatically set those values when you create and update a model object. Is there a way to save the model without touching those columns?

我带来一些遗留的数据，我想从相应的值在（名称不同的）传统的数据字段设置这些值。我发现，当我设置它们的模型，然后保存模型，Rails的出现改写传入的值。

I am bringing in some legacy data and I would like to set those values from the corresponding values in the (differently named) legacy data fields. I'm finding when I set them on the model and then save the model, Rails appears to override the incoming values.

当然，我可能只是名字不同Rails的模型中的列到，但数据导入后，我想Rails的做它的自动时间戳的事情prevent。

Of course I could just name the Rails model columns differently to prevent that, but after the data is imported, I want Rails to do its automatic timestamp thing.

推荐答案

在迁移或耙子任务（或的的，如果你是在边缘轨道）：

Do this in a migration or in a rake task (or in the new database seeds if you're on edge rails):

ActiveRecord::Base.record_timestamps = false
begin
  run_the_code_that_imports_the_data
ensure
  ActiveRecord::Base.record_timestamps = true  # don't forget to enable it again!
end

您可以安全地设置 created_at 和的updated_at 手动，Rails会不会抱怨。

You can safely set created_at and updated_at manually, Rails won't complain.

请注意：    这也适用于个别型号，如      User.record_timestamps = FALSE

Note: This also works on individual models, e.g. User.record_timestamps = false

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