如何将对象“id”存储在迁移文件中？

发布于 2024-11-18 05:30:24 字数 406 浏览 0 评论 0原文

我正在使用 Ruby on Rails 3.0.7 和 MySQL 5.1。我想强制将对象 id 存储在迁移文件中。例如我有这个：

User.create!(
  :name => 'Test name'
)

但我想做这样的事情：

User.create!(
  :id   => '12345', # Force to store the object data with id '12345'
  :name => 'Test name'
)

注意：上面的代码不会强制数据库中的id值。

可能吗？如果是这样，怎么办？

原文

I'm using Ruby on Rails 3.0.7 and MySQL 5.1. I'd like to force to store the object id in a migration file. For example I have this:

User.create!(
  :name => 'Test name'
)

but I would like to do something like this:

User.create!(
  :id   => '12345', # Force to store the object data with id '12345'
  :name => 'Test name'
)

Note: the above code will not force the id value in the database.

Is it possible? If so, how?

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め七分饶幸 2024-11-25 05:30:24

您无法批量分配 id 等受限字段。但您可以单独设置它们：

user = User.new(:name => 'Test name')
user.id = 12345
user.save!

或

User.create!(:name => 'Test name') do |user|
  user.id = 12345
end

You can't mass assign the restricted fields like id. But you can individually set them:

user = User.new(:name => 'Test name')
user.id = 12345
user.save!

User.create!(:name => 'Test name') do |user|
  user.id = 12345
end

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小ぇ时光︴ 2024-11-25 05:30:24

您确实可以批量分配受保护的字段。以下是具体操作方法。在您的模型中定义以下内容：

def attributes_protected_by_default
  default = [ self.class.inheritance_column ]
end

您在这里所做的是重写基本方法：

# The primary key and inheritance column can never be set by mass-assignment for security reasons.
def self.attributes_protected_by_default
  default = [ primary_key, inheritance_column ]
  default << 'id' unless primary_key.eql? 'id'
  default
end

...仅包含 inheritance_column ，不包括 id 或 primary_key< /代码> 列。此时，您现在可以为该模型批量分配 ID。

You can indeed mass-assign protected fields. Here's how to do it. In your model define the following:

def attributes_protected_by_default
  default = [ self.class.inheritance_column ]
end

What you are doing here is overriding the base method:

# The primary key and inheritance column can never be set by mass-assignment for security reasons.
def self.attributes_protected_by_default
  default = [ primary_key, inheritance_column ]
  default << 'id' unless primary_key.eql? 'id'
  default
end

...to include only the inheritance_column excluding the id, or primary_key column. At this point you can now mass-assign the ID for that model.

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