Question

仍在学习Rails。这个让我拔头发。

验证模型时，我试图使模型仅在7和14的days_in_week有效。

我有一个简单的模型：

class ScheduleRotum < ApplicationRecord
  attr_accessor :start_date, :end_date, :days_in_week

  validate :trial_trial
  validates :days_in_week, presence: true
  validates :days_in_week, inclusion: { in: [ 7,14 ] } 
  validates :days_in_week, numericality: true


  def initialize(start_date: '', end_date: '', days_in_week: 7)
    @start_date   = start_date
    @end_date     = end_date
    @days_in_week = days_in_week
  end 

  def trial_trial
    unless @days_in_week == 7 or @days_in_week == 14
      errors[:base] << 'Wrong number of dates'
    end 
  end 
end

前三个验证有效。但是，包括数字变量在内的任何验证都将导致错误（在我尝试过的所有排列中）：

2) ScheduleRotum#initialize days in week 15 is invalid
   Failure/Error: expect(rotum).not_to be_valid

 NoMethodError:
   undefined method `[]' for nil:NilClass

这是该规范的代码：

require 'rails_helper'

RSpec.describe ScheduleRotum, type: :model do
  context 'days in week' do
  it 'is only valid as 7 or 14' do
    rotum = ScheduleRotum.new days_in_week: 14
    expect(rotum).to be_valid
    expect(rotum.days_in_week).to eq 14
  end
  it '15 is invalid' do
    rotum = ScheduleRotum.new days_in_week: 15
    expect(rotum).not_to be_valid
  end

  end
end

我无法弄清楚为什么要使用数字验证来创建nilClass。有见识吗？

nil：NilClass错误，带有数字验证

0 个答案: