ruby-on-rails - Rspec - 预期 ActiveRecord::RecordInvalid 但没有引发任何问题？

Question

我正在使用 rspec 创建测试并尝试引发错误“ActiveRecord::RecordInvalid”，但我一直收到“预期的 ActiveRecord::RecordInvalid 但未引发任何错误”

我是 rspec 测试的新手，这实际上是我第一次直接询问有关堆栈溢出的问题。因此我的问题可能很幼稚，所以我提前道歉。

class InsiderMailAddress < ActiveRecord::Base

   def self.get_list_by_role(role)
   address = InsiderMailAddress.find_by_role(role)
   end
end


 describe "get list by role" do    
   it "raises error when invalid role is given" do
     expect {
     InsiderMailAddress.get_list_by_role(:role)
   }.to raise_error(ActiveRecord::RecordInvalid)
   end
 end

Answer 1

那是错误的异常。

ActiveRecord::RecordInvalid 在记录无效时引发。非常不言自明。

class Country < ApplicationRecord
  validates_presence_of :name
end

---

irb(main):001:0> Country.create
   (0.7ms)  BEGIN
   (0.2ms)  ROLLBACK
=> #<Country id: nil, name: nil, created_at: nil, updated_at: nil>
irb(main):002:0> Country.create!
   (0.3ms)  BEGIN
   (0.4ms)  ROLLBACK
ActiveRecord::RecordInvalid: Validation failed: Name can't be blank
    from (irb):2

如您所见，当您调用 .create 时它不会被引发。 - 但它是当你调用“bang”方法时 .save!和 .create! .

您可能正在寻找的是 ActiveRecord::RecordNotFound。

irb(main):001:0> Country.find(1)
  Country Load (0.5ms)  SELECT  "countries".* FROM "countries" WHERE "countries"."id" = $1 LIMIT $2  [["id", 1], ["LIMIT", 1]]
ActiveRecord::RecordNotFound: Couldn't find Country with 'id'=1
    from (irb):1
irb(main):002:0> Country.find_by(id: 1)
  Country Load (0.9ms)  SELECT  "countries".* FROM "countries" WHERE "countries"."id" = $1 LIMIT $2  [["id", 1], ["LIMIT", 1]]
=> nil
irb(main):003:0> Country.find_by!(id: 1)
  Country Load (0.7ms)  SELECT  "countries".* FROM "countries" WHERE "countries"."id" = $1 LIMIT $2  [["id", 1], ["LIMIT", 1]]
ActiveRecord::RecordNotFound: Couldn't find Country
    from (irb):3

正如你从这个例子中看到的，它不是由 .find_by 引发的。 - 而只是返回零。如果您想引发异常，则需要使用 .find_by! 代替。同样适用于dynamic finders .