Question

我有以下设置。汽车与贷款挂钩，贷款需要分配给汽车。业务逻辑规定如果没有贷款，汽车就不存在。所以我将外键设置为null: false。现在我很难直接设置测试环境。问题是after create回调。我想在每次创建汽车后创建自动创建贷款。但是我暂时把汽车ID分配给了贷款。

我在下面使用的语法导致错误。每一个帮助表示赞赏

class Car < ActiveRecord::Base
 has_one loan
end
class Loan < ActiveRecord::Base
 belongs_to car
end

spec/factories.rb
factory :car
 model Faker::GameOfThromes.house
 manufactoring_plant Faker::StarWars.planet
 after(:create) do |car|
  create :loan, car_id: car.id #error
  # car.create_loan 
 end
end


factory :loan
 initial_amount Faker::Number.number(5)
 start_date Faker::Date.backward(15)
 stop_date Date.tomorrow
 installment_amount 1000
end

更新

当我使用factory girl associations时，我会获得PG::NotNullViolation error

factory :car
 model Faker::GameOfThromes.house
 manufactoring_plant Faker::StarWars.planet
 loan
end

结果

An error occurred in a `before(:suite)` hook.
Failure/Error: FactoryGirl.lint

FactoryGirl::InvalidFactoryError:
 The following factories are invalid:

 * car - PG::NotNullViolation: ERROR:  null value in column "car_id" violates not-null constraint
 DETAIL:  Failing row contains (1, 1453, null, 2016-11-04 10:29:05.4881, 2016-11-04 10:29:05.4881, 2016-11-04, 2000-01-01, null, null, 9588, 1162, ).
 : INSERT INTO "loans" ("start_date", "stop_date", "initial_amount",  "installment_amount", "created_at", "updated_at") VALUES ($1, $2, $3, $4, $5,  $7) RETURNING "id" (ActiveRecord::StatementInvalid)
 * loan - PG::NotNullViolation: ERROR:  null value in column "car_id" violates not-null constraint
 DETAIL:  Failing row contains (2, 1453, null, 2016-11-04 10:29:05.49128, 2016-11-04 10:29:05.49128, 2016-11-04, 2000-01-01, null, null, 9588, 1162, 0, f).

外键具有所有标准名称，例如car_id，为什么factory girl无法创建关联？

Rails工厂女孩在回调中创建工厂

0 个答案: