验证非模型字段 [英] Validate non-model field

问题描述

我在我的新表单中添加了一个额外的字段:

I've added an extra field to my new form:

<%= select_tag :quantity, options_for_select(["Select a Value"].concat((1..10).to_a)) %>

它指定要创建的记录的副本数.

It specifies the number of copies of the record to be created.

我如何验证该字段的存在(或数量)，因为它不是模型本身的一部分?

How can I validate the presence (or numericality) of that field, as it's not part of the model itself?

validates_presence_of :quantity 失败！！！

推荐答案

已找到.您可能希望在模型中添加一个虚拟属性.

Found. You may want to add a virtual attribute in the model.

.........

attr_accessor :not_on_db
.........

validates_presence_of     :not_on_db,
validates_length_of       :not_on_db,    :within => 1..5
.........

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