Question

我正在使用rails 3.0.5，并且我为我的模型进行了自定义验证，当我创建或更新容器记录时，验证有效执行并在必要时添加错误，但记录仍然是保存在数据库中。

我已经测试了自定义验证方法的每一步，并且工作正常。

这是我的模型和自定义验证：

class Container < ActiveRecord::Base
  include Comparable
  belongs_to :booking

  validates :booking, presence: true
  validates :kind, presence: true
  validates :dimension, presence: true, numericality: { only_integer: true }
  validates :retirement_location, presence: true
  validates :amount, presence: true, numericality: { only_integer: true, greater_than_or_equal_to: 1 }
  validate :uniqueness_of_single_fields

  scope :group, lambda {|k,d| where('kind = ? and dimension = ?',k,d) }

  def self.to_hash
    {
      "kind" => self.kind.to_s,
      "dimension" => self.dimension.to_s,
      "retirement_location" => self.retirement_location.to_s
    }
  end

  def uniqueness_of_single_fields
    similar_containers = Container.joins(:booking).where('bookings.requirement_id = ? and containers.id != ?', booking.requirement.id, id)
    similar_containers = similar_containers.where(assigned_unit: assigned_unit, assigned_seal: assigned_seal)

    unless similar_containers.empty?
      errors.add(:base, "esa unidad y sello ya han sido asignados")
    end
  end

  def <=>(other)
    result = kind <=> other.kind
    result == 0 ? dimension <=> other.dimension : result
  end
end

P.S。我已经检查了以前的问题，但没有一个能够得到答案

我做了一个rspec测试试试这个

require 'spec_helper'

describe Container do
  it 'should have a uniq combination assigned unit and seal for in a requirement' do
    requirement1 = Factory(:requirement, reference: 'abc123')
    requirement2 = Factory(:requirement, reference: 'qwerty')

        booking1 = Factory(:booking, reference: 'FOOBAR123', requirement: requirement1)
    booking2 = Factory(:booking, reference: 'FOOBAR456', requirement: requirement1)
    booking3 = Factory(:booking, reference: 'FOOBAR789', requirement: requirement2)

    container1 = Factory(:container, assigned_unit: 'foo1', assigned_seal: 'bar1', booking: booking1)
    container2 = Factory.build(:container, assigned_unit: 'foo1', assigned_seal: 'bar1', booking: booking2)
    container3 = Factory(:container, assigned_unit: 'foo1', assigned_seal: 'bar1', booking: booking3)

    container1.should be_valid
    container3.should be_valid

    puts container2.errors
    container2.save
    puts container2.inspect
    container2.should_not be_valid
    puts container2.errors.inspect
    container2.errors[:base].first.should == "esa unidad y sello ya han sido asignados"

    c = Requirement.new(client: 'foo')
    c.save
    puts c.errors
    puts c.inspect
  end
end

，输出为:(当它失败时通过）

{}
#<Container id: 6, kind: "dry", dimension: 20, retirement_location: "sitrans", booking_id: 5, created_at: "2011-03-28 22:31:13", updated_at: "2011-03-28 22:31:13", load: "wine 2", assigned_unit: "foo1", assigned_seal: "bar1", temp_celsius: nil, temp_fahrenheit: nil, vent_percentage: nil, vent_cfm: nil, generator: nil, amount: 1>
{:base=>["esa unidad y sello ya han sido asignados"]}
{:service=>["Debe elegir un tipo de servicio"], :shipping_company=>["Debe haber una naviera relacionada con esta orden de servicio"]}
#<Requirement id: nil, client: "foo", service_id: nil, realization: nil, hour: nil, shipping_company_id: nil, description: nil, created_at: nil, updated_at: nil, reference: nil, state: "new">
.

Finished in 0.45293 seconds
1 example, 0 failures

Answer 1

我认为你很接近，但你一直在阅读片段而不是教程或文档。如果您引用Railscast Episode On Rails3 Validations，那么您将看到他们建议您定义自己的自定义验证器子类，而不是将另一个函数粘贴到模型上。

你可能会说抽象不仅仅是因为它“更合适”还是其他一些？然后查看API doc for Validations

在这里，他们说“最小的实现”就像：

class Person
  include ActiveModel::Validations

  attr_accessor :first_name, :last_name

  validates_each :first_name, :last_name do |record, attr, value|
    record.errors.add attr, 'starts with z.' if value.to_s[0] == ?z
  end
end

或

class Person
  include ActiveModel::Validations

  validates :instance_validations

  def instance_validations
    validates_with MyValidator
  end
end

最重要的是API entry for the validates method，他们甚至建议您在类/模型中定义自定义的Validator类：

class Film
  include ActiveModel::Validations

  class TitleValidator < ActiveModel::EachValidator
    def validate_each(record, attribute, value)
      record.errors[attribute] << "must start with 'the'" unless value =~ /\Athe/i
    end
  end

  validates :name, :title => true
end

干杯！

即使自定义验证失败Rails 3，也会保存记录

1 个答案: