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如何积极核查
原标题:Is There a Way To Make ActiveRecord Do A Multiple Insert

我有一对一的关系,有一条<条码>,<>条码>>><代码>:has_many<条码>。

I m 寻求一种办法,在不进行N+1查询的情况下,建立一个Thing及其所有N元素。 我尝试:

[loop in Thing model]
   self.elements.build({...})
...
self.save

但是,它为每个组成部分单独插入一个字。

问题回答

This capability is not built in.

One option is to use a transaction, which will not eliminate the multiple INSERTs but will send all of them in one request, which will help with performance some. For example:

ActiveRecord::Base.transaction do
  1000.times { MyModel.create(options) }
end

但是,如果是真的批量的话,你要么必须写并执行原始询问,要么使用“activerecord-import。 (原为批量的一部分)。 文件的一个例子:

books = []
10.times do |i| 
  books << Book.new(:name => "book #{i}")
end
Book.import books

我认为,这可能是你的最佳选择。





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