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Associations with Rails Engine lead to ActiveRecord::RecordInvalid
Description
I use simple 1:n associations with models residing in a Rails Engine. The main app includes this engine directly under /engines
.
However, the validation fails for belongs_to associations when I use implicit or explicit associations. I even tried out before(:create)
and after(:build)
hooks. Only initialize_with
works, which is kind of limiting.
My test just executes FactoryBot.build(:thing)
(see factories_test.rb). FactoryBot.lint
results in the same error.
Error:
ActiveRecord::RecordInvalid: Validation failed: [MODEL] must exist
My overall setup is a bit more complex. However, this should not influence this bug, as these models / factories use the same database and are integrated into the same Engine. All other parts of this application work - including model tests with manually constructing the models. But FactoryBot seems to ignore my association and just uses nil for it.
Any suggestions? Is there some restriction, when using models from Rails Engines?
Reproduction Steps
I could not reproduce this bug with your reproduction script - as it seems to be connected to the Engine.
engines/some-engine/test/factories/thing_factory.rb in Rails Engine
FactoryBot.define do
factory :thing, class: "Thing" do
# simple association does not work.
association :container, factory: :container
# before(:create) and after(:build) don't work.
after(:build) do | model |
container = create(:container)
end
# this does not work, too.
container { FactoryBot.create(:container) }
# only initialize_with works.
initialize_with do
container = create(:container)
new(attributes.merge(container: container))
end
end
end
engines/some-engine/test/factories/container_factory.rb in Rails Engine
FactoryBot.define do
factory :container, class: "Container" do
...
end
end
engines/some-engine/app/models/thing.rb in Rails Engine
# table with container_id
class Thing < ApplicationRecord
belongs_to :container
end
engines/some-engine/app/models/container.rb in Rails Engine
class Container < ApplicationRecord
has_many :things
end
test/factories_test.rb in main app
FactoryBot.factories.each do |factory|
method_name = "test_#{factory.name}"
define_method(method_name) do
instance = FactoryBot.build(factory.name)
assert instance.valid?, "invalid factory: #{factory.name}, error messages: #{instance.errors.messages.inspect}"
end
end
Resulting Error:
ActiveRecord::RecordInvalid: Validation failed: Container must exist
Expected behavior
FactoryBot.build(:thing) should work with associations.
Actual behavior
Error when executing FactoryBot.lint
:
ActiveRecord::RecordInvalid: Validation failed: Container must exist
System configuration
factory_bot version: 6.2.0 (factory_bot_rails) rails version: 7.0.4.2 ruby version: 3.2.2 Test Framework: Minitest