`let(:name)` will conflict with Rails internals for fixtures #2451

grekko · 2021-02-01T09:43:53Z

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'
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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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I should never have been called
.

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The text was updated successfully, but these errors were encountered:

JonRowe · 2021-02-01T10:04:37Z

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

grekko · 2021-02-01T10:22:23Z

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

grekko · 2021-02-01T10:51:55Z

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?'
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I should never have been called
.

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bcgraham · 2021-02-01T14:29:16Z

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 · 2021-02-01T19:30:57Z

What would be a good solution to this name clash?

grekko · 2021-02-01T22:48:56Z

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 · 2021-02-02T10:39:48Z

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

grekko · 2021-02-02T11:06:40Z

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:

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 · 2021-02-02T14:42:46Z

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.

pirj · 2021-02-03T19:20:40Z

Any idea where @example comes from? In the snippet, it evaluates to nil if I monkey-patch run_in_transaction? and set a breakpoint there.

bcgraham · 2021-02-04T18:34:21Z

My theory is it's a very, very old relic - entered with f3de931, but irrelevant in rspec-core since d941ba7. I haven't seen what happens to tests if it gets removed/changed, though.

cf. rspec/rspec-rails#2451

* Bump rails from 6.0.3.4 to 6.1.1 Bumps [rails](https://github.com/rails/rails) from 6.0.3.4 to 6.1.1. - [Release notes](https://github.com/rails/rails/releases) - [Commits](rails/rails@v6.0.3.4...v6.1.1) Signed-off-by: dependabot-preview[bot] <[email protected]> * bin/rails app:update * Avoid a bug of rails 6.1 cf. rspec/rspec-rails#2451 * Make active_decorator work for Elasticsearch response Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com> Co-authored-by: Takahiro Miyoshi <[email protected]>

st0012 · 2021-02-15T08:01:31Z

I'm having issues with the run_in_transaction? method as well. I don't know how @example is set and it's always nil in my cases. So I use this small patch to avoid the issue:

module RSpec
  module Rails
    module FixtureSupport
      def name
        method_name
      end
    end
  end
end

pirj · 2021-02-15T08:45:37Z

@st0012 Can you try using rspec-rails from the 4.1 branch (rails-6-1-dev)?

gem 'rspec-rails', github: 'rspec/rspec-rails', branch: 'rails-6-1-dev'

st0012 · 2021-02-15T08:50:18Z

@pirj I do use the branch now. the patch I mentioned needs it to work 🙂 but just using the branch doesn't solve the issue, unfortunately.

Fix: #2451

benoittgt · 2021-02-20T13:27:36Z

Fixed by #2461

grekko changed the title ~~RSpec::Rails::FixtureSupport::Fixtures#name may cause weird behaviour~~ [wip] RSpec::Rails::FixtureSupport::Fixtures#name may cause weird behaviour Feb 1, 2021

JonRowe closed this as completed Feb 1, 2021

grekko changed the title ~~[wip] RSpec::Rails::FixtureSupport::Fixtures#name may cause weird behaviour~~ [wip] Unintended call to memoized helper name Feb 1, 2021

grekko changed the title ~~[wip] Unintended call to memoized helper name~~ [wip] Unexpected call to memoized helper name Feb 1, 2021

grekko changed the title ~~[wip] Unexpected call to memoized helper name~~ [wip] Unexpected call to let(:name) Feb 1, 2021

grekko changed the title ~~[wip] Unexpected call to let(:name)~~ Unexpected call to let(:name) Feb 1, 2021

JonRowe reopened this Feb 2, 2021

JonRowe changed the title ~~Unexpected call to let(:name)~~ let(:name) will conflict with Rails internals for fixtures Feb 2, 2021

pirj mentioned this issue Feb 3, 2021

Support Rails 6.1 #2398

Merged

3 tasks

sankichi92 added a commit to sankichi92/LiveLog that referenced this issue Feb 6, 2021

Avoid a bug of rails 6.1

39ab174

cf. rspec/rspec-rails#2451

benoittgt added a commit that referenced this issue Feb 17, 2021

Prevent collision on :name and :method_name in rspec-rails examples

e841f0a

Fix: #2451

benoittgt added a commit that referenced this issue Feb 17, 2021

Prevent collisions on let :name and :method_name in rspec-rails examples

f00ec78

Fix: #2451

benoittgt mentioned this issue Feb 17, 2021

Prevent collisions on let(:name) and let(:method_name) #2461

Merged

pirj pushed a commit that referenced this issue Feb 19, 2021

Prevent collisions on let :name and :method_name in rspec-rails examples

4aa5e0b

Fix: #2451

benoittgt closed this as completed Feb 20, 2021

pirj mentioned this issue Jan 11, 2024

Guard against name collisions with internals rspec/rspec-core#3063

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`let(:name)` will conflict with Rails internals for fixtures #2451

`let(:name)` will conflict with Rails internals for fixtures #2451

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benoittgt commented Feb 20, 2021

let(:name) will conflict with Rails internals for fixtures #2451

let(:name) will conflict with Rails internals for fixtures #2451

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grekko commented Feb 1, 2021 • edited Loading

What Ruby, Rails and RSpec versions are you using?

Observed behaviour

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Can you provide an example app?

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What I changed

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`let(:name)` will conflict with Rails internals for fixtures #2451

`let(:name)` will conflict with Rails internals for fixtures #2451

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