将字段名称作为参数传递给自定义验证方法 Rails 4 [英] Pass field name as parameter to custom validation method Rails 4

问题描述

我有一个自定义验证方法:

I have a custom validation method:

def my_custom_validation
  errors.add(specific_field, "error message") if specific_field.delete_if { |i| i.blank? }.blank?
end

目标是禁止包含 [""] 的参数通过验证，但我需要像这样调用这个方法:

The goal is to disallow parameters which contains [""] pass through validation, but I need to call this method like:

validate :my_custom_validation #and somehow pass here my field names

例如:

 validate :my_custom_validation(:industry) 

推荐答案

由于您需要以这种方式验证多个属性，我会推荐一个像这样的自定义验证器:

Since you need to validate multiple attributes this way I would recommend a custom validator like so:

class EmptyArrayValidator < ActiveModel::EachValidator
  def validate_each(record, attribute, value)
    record.errors[attribute] << (options[:message] || "cannot be emtpy") if value.delete_if(&:blank?).empty?
  end
end

然后验证为

validates :industry, empty_array: true
validates :your_other_attribute, empty_array: true

或者，如果您不想专门创建一个类，因为它只需要 1 个模型，您可以将其包含在模型本身中

Or if you don't want to specifically create a class because it is only needed for 1 model you could include this in the model itself

validates_each :industry, :your_other_attribute, :and_one_more do |record, attr, value|
  record.errors.add(attr, "cannot be emtpy") if value.delete_if(&:blank?).empty?
end

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