`let(:name)` will conflict with Rails internals for fixtures

[grekko]

What Ruby, Rails and RSpec versions are you using?

Ruby version: 2.7.1
Rails version: 6.1.1
RSpec version: 4.0.2

Observed behaviour

One of my specs started to fail while upgrading rails from 6.0 to 6.1.

I noticed that a let(:name)-declaration in my spec was being called from ActiveRecord::TestFixtures#run_in_transaction? which is AFAIU supposed to call RSpec::Rails::FixtureSupport::Fixtures#name instead.

Expected behaviour

I'd want to be warned if I'm redefining a reserved method via RSpec::Core::MemoizedHelpers#let similar to how initialize is a reserved keyword.

Can you provide an example app?

Start with a blank rails app (Version => 6.1):

gem install rails -v '6.1.1'
rails new rspec-rails-issue

Install rspec-rails (Version >= 4.0.2):

group :development, :test do
  gem 'rspec-rails', '~> 4.0.2'
end

Install RSpec:

rails generate rspec:install

Create spec/some_spec.rb:

require 'rails_helper'

RSpec.describe "observes a call to :name" do
  subject { true }

  let(:name) { puts caller; puts "I should never have been called" }

  it { is_expected.to be_truthy }
end

Run the spec:

rspec spec/some_spec.rb
[…path omitted]/.asdf/installs/ruby/2.7.1/lib/ruby/gems/2.7.0/gems/rspec-core-3.10.1/lib/rspec/core/memoized_helpers.rb:317:in `block (2 levels) in let'
[…path omitted]/.asdf/installs/ruby/2.7.1/lib/ruby/gems/2.7.0/gems/rspec-core-3.10.1/lib/rspec/core/memoized_helpers.rb:157:in `block (3 levels) in fetch_or_store'
[…path omitted]/.asdf/installs/ruby/2.7.1/lib/ruby/gems/2.7.0/gems/rspec-core-3.10.1/lib/rspec/core/memoized_helpers.rb:157:in `fetch'
[…path omitted]/.asdf/installs/ruby/2.7.1/lib/ruby/gems/2.7.0/gems/rspec-core-3.10.1/lib/rspec/core/memoized_helpers.rb:157:in `block (2 levels) in fetch_or_store'
[…path omitted]/.asdf/installs/ruby/2.7.1/lib/ruby/gems/2.7.0/gems/rspec-support-3.10.2/lib/rspec/support/reentrant_mutex.rb:23:in `synchronize'
[…path omitted]/.asdf/installs/ruby/2.7.1/lib/ruby/gems/2.7.0/gems/rspec-core-3.10.1/lib/rspec/core/memoized_helpers.rb:156:in `block in fetch_or_store'
[…path omitted]/.asdf/installs/ruby/2.7.1/lib/ruby/gems/2.7.0/gems/rspec-core-3.10.1/lib/rspec/core/memoized_helpers.rb:155:in `fetch'
[…path omitted]/.asdf/installs/ruby/2.7.1/lib/ruby/gems/2.7.0/gems/rspec-core-3.10.1/lib/rspec/core/memoized_helpers.rb:155:in `fetch_or_store'
[…path omitted]/.asdf/installs/ruby/2.7.1/lib/ruby/gems/2.7.0/gems/rspec-core-3.10.1/lib/rspec/core/memoized_helpers.rb:317:in `block in let'
[…path omitted]/.asdf/installs/ruby/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.1/lib/active_record/test_fixtures.rb:102:in `run_in_transaction?'
[…path omitted]/.asdf/installs/ruby/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.1/lib/active_record/test_fixtures.rb:116:in `setup_fixtures'
[…path omitted]/.asdf/installs/ruby/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.1/lib/active_record/test_fixtures.rb:10:in `before_setup'
[…path omitted]/.asdf/installs/ruby/2.7.1/lib/ruby/gems/2.7.0/gems/rspec-rails-4.0.2/lib/rspec/rails/adapters.rb:74:in `block (2 levels) in <module:MinitestLifecycleAdapter>'
[…path omitted]/.asdf/installs/ruby/2.7.1/lib/ruby/gems/2.7.0/gems/rspec-core-3.10.1/lib/rspec/core/example.rb:455:in `instance_exec'
[…path omitted]/.asdf/installs/ruby/2.7.1/lib/ruby/gems/2.7.0/gems/rspec-core-3.10.1/lib/rspec/core/example.rb:455:in `instance_exec'
[…path omitted]/.asdf/installs/ruby/2.7.1/lib/ruby/gems/2.7.0/gems/rspec-core-3.10.1/lib/rspec/core/hooks.rb:390:in `execute_with'
[…path omitted]/.asdf/installs/ruby/2.7.1/lib/ruby/gems/2.7.0/gems/rspec-core-3.10.1/lib/rspec/core/hooks.rb:628:in `block (2 levels) in run_around_example_hooks_for'
[…path omitted]/.asdf/installs/ruby/2.7.1/lib/ruby/gems/2.7.0/gems/rspec-core-3.10.1/lib/rspec/core/example.rb:350:in `call'
[…path omitted]/.asdf/installs/ruby/2.7.1/lib/ruby/gems/2.7.0/gems/rspec-core-3.10.1/lib/rspec/core/hooks.rb:629:in `run_around_example_hooks_for'
[…path omitted]/.asdf/installs/ruby/2.7.1/lib/ruby/gems/2.7.0/gems/rspec-core-3.10.1/lib/rspec/core/hooks.rb:486:in `run'
[…path omitted]/.asdf/installs/ruby/2.7.1/lib/ruby/gems/2.7.0/gems/rspec-core-3.10.1/lib/rspec/core/example.rb:465:in `with_around_example_hooks'
[…path omitted]/.asdf/installs/ruby/2.7.1/lib/ruby/gems/2.7.0/gems/rspec-core-3.10.1/lib/rspec/core/example.rb:508:in `with_around_and_singleton_context_hooks'
[…path omitted]/.asdf/installs/ruby/2.7.1/lib/ruby/gems/2.7.0/gems/rspec-core-3.10.1/lib/rspec/core/example.rb:259:in `run'
[…path omitted]/.asdf/installs/ruby/2.7.1/lib/ruby/gems/2.7.0/gems/rspec-core-3.10.1/lib/rspec/core/example_group.rb:644:in `block in run_examples'
[…path omitted]/.asdf/installs/ruby/2.7.1/lib/ruby/gems/2.7.0/gems/rspec-core-3.10.1/lib/rspec/core/example_group.rb:640:in `map'
[…path omitted]/.asdf/installs/ruby/2.7.1/lib/ruby/gems/2.7.0/gems/rspec-core-3.10.1/lib/rspec/core/example_group.rb:640:in `run_examples'
[…path omitted]/.asdf/installs/ruby/2.7.1/lib/ruby/gems/2.7.0/gems/rspec-core-3.10.1/lib/rspec/core/example_group.rb:606:in `run'
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[…path omitted]/.asdf/installs/ruby/2.7.1/lib/ruby/gems/2.7.0/gems/rspec-core-3.10.1/lib/rspec/core/runner.rb:121:in `map'
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[…path omitted]/.asdf/installs/ruby/2.7.1/lib/ruby/gems/2.7.0/gems/rspec-core-3.10.1/lib/rspec/core/configuration.rb:2067:in `with_suite_hooks'
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[…path omitted]/.asdf/installs/ruby/2.7.1/bin/rspec:23:in `load'
[…path omitted]/.asdf/installs/ruby/2.7.1/bin/rspec:23:in `<main>'
I should never have been called
.

Finished in 0.02096 seconds (files took 1.89 seconds to load)
1 example, 0 failures

[JonRowe]

Please use the unreleased version in rails-6-1-dev there is a fix for this.
(Closed as duplicate of #2417)

[grekko]

Thanks @JonRowe :) Yes, I see that #2423 will fix that issue.

[grekko]

I wanted to verify that #2423 would fix the issue I described, so I adjusted the setup from the PR description:

What I changed

I replaced the reference to rspec 4.0.2 with rails-6-1-dev:

diff --git a/Gemfile b/Gemfile
index 082f631..8b9771b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -55,6 +55,9 @@ end
 # Windows does not include zoneinfo files, so bundle the tzinfo-data gem
 gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]
 
-group :development, :test do
-  gem 'rspec-rails', '~> 4.0.2'
+%w[rspec rspec-core rspec-expectations rspec-mocks rspec-support].each do |lib|
+  gem lib, git: "https://github.com/rspec/#{lib}.git", branch: "main"
+end
+git "https://github.com/rspec/rspec-rails", branch: "rails-6-1-dev" do
+  gem "rspec-rails"
 end

… and rerunning the spec above displays the same behaviour:

bundle exec rspec spec/some_spec.rb
[…path omitted]/.asdf/installs/ruby/2.7.1/lib/ruby/gems/2.7.0/bundler/gems/rspec-core-ecb65d2d4ea7/lib/rspec/core/memoized_helpers.rb:339:in `block (2 levels) in let'
[…path omitted]/.asdf/installs/ruby/2.7.1/lib/ruby/gems/2.7.0/bundler/gems/rspec-core-ecb65d2d4ea7/lib/rspec/core/memoized_helpers.rb:179:in `block (3 levels) in fetch_or_store'
[…path omitted]/.asdf/installs/ruby/2.7.1/lib/ruby/gems/2.7.0/bundler/gems/rspec-core-ecb65d2d4ea7/lib/rspec/core/memoized_helpers.rb:179:in `fetch'
[…path omitted]/.asdf/installs/ruby/2.7.1/lib/ruby/gems/2.7.0/bundler/gems/rspec-core-ecb65d2d4ea7/lib/rspec/core/memoized_helpers.rb:179:in `block (2 levels) in fetch_or_store'
[…path omitted]/.asdf/installs/ruby/2.7.1/lib/ruby/gems/2.7.0/bundler/gems/rspec-support-d04c8aef72d0/lib/rspec/support/reentrant_mutex.rb:23:in `synchronize'
[…path omitted]/.asdf/installs/ruby/2.7.1/lib/ruby/gems/2.7.0/bundler/gems/rspec-core-ecb65d2d4ea7/lib/rspec/core/memoized_helpers.rb:178:in `block in fetch_or_store'
[…path omitted]/.asdf/installs/ruby/2.7.1/lib/ruby/gems/2.7.0/bundler/gems/rspec-core-ecb65d2d4ea7/lib/rspec/core/memoized_helpers.rb:177:in `fetch'
[…path omitted]/.asdf/installs/ruby/2.7.1/lib/ruby/gems/2.7.0/bundler/gems/rspec-core-ecb65d2d4ea7/lib/rspec/core/memoized_helpers.rb:177:in `fetch_or_store'
[…path omitted]/.asdf/installs/ruby/2.7.1/lib/ruby/gems/2.7.0/bundler/gems/rspec-core-ecb65d2d4ea7/lib/rspec/core/memoized_helpers.rb:339:in `block in let'
[…path omitted]/.asdf/installs/ruby/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.1/lib/active_record/test_fixtures.rb:102:in `run_in_transaction?'
[…path omitted]/.asdf/installs/ruby/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.1/lib/active_record/test_fixtures.rb:116:in `setup_fixtures'
[…path omitted]/.asdf/installs/ruby/2.7.1/lib/ruby/gems/2.7.0/gems/activerecord-6.1.1/lib/active_record/test_fixtures.rb:10:in `before_setup'
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[…path omitted]/.asdf/installs/ruby/2.7.1/lib/ruby/gems/2.7.0/bundler/gems/rspec-core-ecb65d2d4ea7/lib/rspec/core/hooks.rb:629:in `run_around_example_hooks_for'
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I should never have been called
.

Finished in 0.03632 seconds (files took 1.38 seconds to load)
1 example, 0 failures

[bcgraham]

This is an excellent representation of what I was seeing in #2417 (comment here). Like @grekko said above, it seems like the fundamental issue is the ActiveSupport method run_in_transaction? (changed between Rails 6.0 and 6.1), which is run in the example namespace, calling name; any let(:name) will override the method in RSpec::Rails::FixtureSupport:

# spec/some_spec.rb
require 'rails_helper'

RSpec.describe "observes a call to :name" do
  subject { true }

  let(:name) do
    method(__method__).owner # => RSpec::ExampleGroups::ObservesACallToName < RSpec::Core::ExampleGroup
    method(__method__).super_method.owner # => RSpec::ExampleGroups::ObservesACallToName::LetDefinitions
    method(__method__).super_method.super_method.owner # => RSpec::Rails::FixtureSupport
    correct_method = method(__method__).super_method.super_method
    puts "calling to #{correct_method.source_location.join(?:)}"
    # => calling to /yadda/yadda/gems/rspec-rails-3ddfb3abe2b0/lib/rspec/rails/fixture_support.rb:67
    correct_method.call
  end

  it do
    is_expected.to be_truthy
  end
end

[pirj]

What would be a good solution to this name clash?

[grekko]

What would be a good solution to this name clash?

I am sure that I only understand parts of what is going on, but I'll try to describe what I understand of the situation:

---

The change to ActiveRecord::TestFixtures#run_in_transaction? (see https://github.com/rails/rails/pull/37770/files#diff-f13ae79247e372ebb6bbcf12cf91ab51e7d3137136b92342fc71bfa6d8a3ac84L101-R101) decoupled ActiveRecord::TestFixtures from ActiveSupport::TestCase (namely the methods file_fixture_path and method_name).

With that change ActiveRecord::TestFixtures#run_in_transaction? is directly calling Minitest::Runnable#name which seems to be the official way to determine a test methods name. Which eventually lead to the adjustments in rspec-rails.

---

I have no good solutions or proposals at hand yet but some rough graceless monkeypatching ideas:

a) rspec-rails may monkeypatch ActiveRecord::TestFixtures#run_in_transaction? instead of providing a custom #name-Implementation.

diff --git a/lib/rspec/rails/fixture_support.rb b/lib/rspec/rails/fixture_support.rb
index 2161b115..2bad6aa6 100644
--- a/lib/rspec/rails/fixture_support.rb
+++ b/lib/rspec/rails/fixture_support.rb
@@ -52,9 +52,9 @@ module RSpec
           end
 
           if ::Rails.version.to_f >= 6.1
-            # @private return the example name for TestFixtures
-            def name
-              @example
+            def run_in_transaction?
+              use_transactional_tests &&
+                !self.class.uses_transaction?(@example)
             end
           end
         end

or one might propose to change ActiveRecord::TestFixtures to use some indirect call to a method name that is less likely to collide, e.g. _current_test_name:

diff --git a/activerecord/lib/active_record/test_fixtures.rb b/activerecord/lib/active_record/test_fixtures.rb
index b987dc0ca6..acc43e3d8e 100644
--- a/activerecord/lib/active_record/test_fixtures.rb
+++ b/activerecord/lib/active_record/test_fixtures.rb
@@ -99,7 +99,12 @@ def uses_transaction?(method)
 
     def run_in_transaction?
       use_transactional_tests &&
-        !self.class.uses_transaction?(name)
+        !self.class.uses_transaction?(_current_test_name)
+    end
+
+    def _current_test_name
+      # Minitest::Runnable#name
+      name
     end
 
     def setup_fixtures(config = ActiveRecord::Base)

… which rspec-rails could then hook into.

[JonRowe]

I'm not convinced this is directly the issue, but if it is then the monkey patching is an acceptable solution

[grekko]

I'm not convinced this is directly the issue […]

Do you mean that there is some problem underneath?

---

I tried to figure out what the purpose of #ActiveRecord::TestFixtures#run_in_transaction? and its counterpart ActiveSupport::TestFixtures#uses_transaction is.

It is public API and I can find two usages of the API in ActiveRecord tests:

• TransactionCallbacksTest::TopicWithCallbacks#test_after_commit_callback_should_not_rollback_state_that_already_been_succeeded
• PostgresqlUUIDHelper::PostgresqlUUIDGenerationTest#test_schema_dumper_for_uuid_primary_key_default_in_legacy_igration

This comment is probably misleading.

It's being used to verify `after_commit`-behaviour.

I can also find other tests though that also verify after_commit-behaviour without relying on ActiveSupport::TestFixtures#uses_transaction, by creating nested DB transactions, e.g.:

• TransactionCallbacksTest::TopicWithCallbacks#test_after_commit_chain_not_called_on_errors

… I wonder if the two usages of ActiveSupport::TestFixtures#uses_transaction might also be replaced with a nested DB transaction, which would at least remove the purpose of ActiveSupport::TestFixtures#uses_transaction for ActiveRecord itself.

ActiveSupport::TestFixtures#uses_transaction is used to prevent ActiveSupport::TestFixtures to start a DB transaction. I do not yet understand for sure why this is necessary for the tests though.

[bcgraham]

FWIW, this behavior can be reproduced on Rails 6.0.3.4 and rspec-rails 4.0.2 if we replace let(:name) with let(:method_name) in @grekko's example.