Question

我想强制用户输入小数点后正好2位数的数字。目前，当用户键入12.349时，它将自动转换为12.35。相反，应该提出验证错误，如：＆＃34;请输入小数点后2位数字。＆＃34;

class Accounting < ActiveRecord::Base

  validates :share_ksk, :central_office, :limit_value, :fix_disagio,
            presence: true, numericality: { less_than: 999.99, greater_than_or_equal_to: 0.00 }
end

我的迁移文件：

class CreateAccountings < ActiveRecord::Migration
  def change
    create_table :accountings do |t|
      t.decimal :share_ksk,         precision: 5, scale: 2, null: false
      t.decimal :central_office,    precision: 5, scale: 2, null: false
      t.decimal :limit_value,       precision: 5, scale: 2, null: false
      t.decimal :fix_disagio,       precision: 5, scale: 2, null: false

      t.timestamps null: false
    end
  end
end

Answer 1

您可以使用format验证执行此操作，并为其指定正则表达式：

validates :share_ksk, :central_office, :limit_value, :fix_disagio,
          presence: true, 
          numericality: { less_than: 999.99, greater_than_or_equal_to: 0.00 },
          format: { with: /\d*\.\d{2}$/, message: "must have two digits after decimal point" }

请参阅：http://guides.rubyonrails.org/active_record_validations.html#format

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1 个答案: