将ActiveModel ID范围增加到8个字节

问题描述

我一直在以了解如何将我所有的新模型ID和后续模型ID的长度限制为8个字节。答案显示了添加新表列时的操作方式。我想每创建一个新的 Model 时，它就会自动具有8个字节的 limit 。

I've been digging around to see how I could have all my newly and subsequent Model id's to have a limit of 8 byte. Answers show how to when adding a new table column; I want whenever I create a new Model, it would automatically has a limit of 8 byte. Possible?

创建新模型时，我得到：

When creating a new model, I get:

在哪里将此限制从4更改为8？

Where to change this limit from 4 to 8?

推荐答案

A ，但由于会出现错误：

A possible duplicate but since there will be errors:

这意味着您的表应如下所示：

Which means your table should look like this:

class MyModels < ActiveRecord::Migration[5.0]
  def change
    create_table :my_models, {id: false } do |t|
      t.column   :id, limit: 8
      ...
     end
  end
end

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