Fix missing-environment fallback to use production

[justin808]

Summary

• change Shakapacker::Env fallback environment to production when RAILS_ENV is not defined in config/shakapacker.yml
• align fallback warning message with the actual production fallback
• update env_spec to assert production fallback behavior

This matches documented behavior and the existing fallback path already used in Shakapacker::Configuration#load.

Closes #866.

Validation

• Could not run bundle-based checks locally because this environment is Ruby 2.6.10 while this repo requires Ruby >= 2.7.

Summary by CodeRabbit

• Bug Fixes

  • When the Rails environment is missing from configuration, the system now falls back to production (ensuring production-optimized builds) instead of development.

• Documentation

  • Updated release notes/changelog to reflect the new production fallback behavior.

[coderabbitai]

Walkthrough

Introduces a production fallback for missing environments by adding a FALLBACK_ENV = "production" constant and updating fallback logic and tests; changelog updated to reflect the behavior change.

Changes

Cohort / File(s)	Summary
Environment Fallback Logic lib/shakapacker/env.rb	Added FALLBACK_ENV = "production".freeze; updated inquire fallback to use FALLBACK_ENV and adjusted the fallback warning message.
Environment Tests spec/shakapacker/env_spec.rb	Updated test to expect Shakapacker.env == "production" when the current Rails env has no config (previously expected development).
Release Notes CHANGELOG.md	Added entry describing the change: fallback to production when a Rails environment is not defined in shakapacker.yml.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Poem

🐰 A hop, a skip, through config we go,
When environments vanish and winds do blow,
Production waits steady, calm and bright,
I nibble the change and thump with delight,
✨🚀

🚥 Pre-merge checks | ✅ 5 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately and concisely describes the main change: fixing the fallback environment from development to production.
Linked Issues check	✅ Passed	The PR successfully addresses issue #866 by changing the fallback environment to production, updating the warning message, and updating tests to reflect the new expected behavior.
Out of Scope Changes check	✅ Passed	All changes are directly related to fixing the environment fallback behavior specified in issue #866; no unrelated modifications are present.
Merge Conflict Detection	✅ Passed	✅ No merge conflicts detected when merging into main

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch codex/issue-866-fallback-production

---

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[greptile-apps]

Greptile Summary

Fixed environment fallback behavior in Shakapacker::Env to use production instead of development when RAILS_ENV is not defined in config/shakapacker.yml.

• Introduced FALLBACK_ENV = "production".freeze constant to replace usage of Shakapacker::DEFAULT_ENV
• Updated warning message to reflect actual production fallback
• Test updated to assert production fallback behavior

This aligns with documented behavior in README and existing fallback logic in Shakapacker::Configuration#load (lines 552-563), which already falls back to production for missing environment configurations.

Confidence Score: 5/5

• This PR is safe to merge with no issues identified
• The change is small, well-tested, and fixes a documented inconsistency. It aligns Shakapacker::Env fallback behavior with the existing Shakapacker::Configuration#load fallback logic and documented behavior
• No files require special attention

Important Files Changed

Filename	Overview
lib/shakapacker/env.rb	Correctly changes fallback environment from development to production to align with documented behavior and Configuration#load
spec/shakapacker/env_spec.rb	Updates test to assert correct production fallback behavior when environment config is missing

Flowchart

flowchart TD
    A[Shakapacker::Env.inquire called] --> B{config_path exists?}
    B -->|No| C[Return FALLBACK_ENV.inquiry]
    B -->|Yes| D{Current RAILS_ENV in available_environments?}
    D -->|Yes| E[Return current RAILS_ENV]
    D -->|No| F[Log fallback warning]
    F --> G[Return FALLBACK_ENV.inquiry]
    
    style C fill:#e1f5e1
    style E fill:#e1f5e1
    style G fill:#e1f5e1
    
    H[FALLBACK_ENV] -.->|"production" after fix| G
    H -.->|"production" after fix| C

Loading

_{Last reviewed commit: 2718cf3}

[justin808]

@claude review this PR

[claude]

Claude finished @justin808's task in 1m 12s —— View job

---

Code Review

Reviewing PR #894: Fix missing-environment fallback to use production

Todo List

• Read changed files
• Analyze code changes
• Check test coverage
• Verify changelog needs
• Provide review feedback

---

Review Summary

This PR correctly fixes the environment fallback behavior to align with documented behavior and existing patterns in the codebase. The implementation is clean and well-tested.

Code Quality: ✅ Excellent

What's Good:

1. Consistency: The change aligns Shakapacker::Env with the existing fallback logic in Shakapacker::Configuration#load (lines 552-563), which already falls back to production when an environment config is missing.

2. Clear Intent: Introducing the FALLBACK_ENV constant makes the fallback behavior explicit and easier to maintain than referencing Shakapacker::DEFAULT_ENV which represents a different concept (the default development environment for new installations).

3. Proper Test Coverage: The test at spec/shakapacker/env_spec.rb:8-12 correctly validates production fallback when a non-existent environment is requested.

4. Accurate Warning Message: The warning message now correctly reflects the actual fallback behavior (production) at lib/shakapacker/env.rb:25.

Code Correctness: ✅ Verified

The changes are semantically correct:

• FALLBACK_ENV = "production".freeze - properly frozen string constant
• Both usages of FALLBACK_ENV are appropriate (line 16 for the actual fallback, line 25 for the warning message)
• Test expectations updated to match the new behavior

Potential Considerations

1. Changelog Entry Needed: According to CLAUDE.md, this is a user-visible bug fix that should have a changelog entry. The fallback behavior is important for production deployments.

   Suggested entry for the "Fixed" section under ## [Unreleased]:

   - **Fixed environment fallback to use production instead of development**. [PR #894](https://github.com/shakacode/shakapacker/pull/894) by [justin808](https://github.com/justin808). When `RAILS_ENV` is not defined in `config/shakapacker.yml`, Shakapacker now correctly falls back to production configuration, matching the documented behavior and aligning with the fallback logic in `Shakapacker::Configuration#load`.

2. Documentation Verification (Optional): While the PR description mentions this "matches documented behavior," it would be good to verify the README or documentation explicitly states production is the fallback. If not documented, this might be worth adding.

3. Constant Visibility: FALLBACK_ENV is defined in the class but only used internally. Consider whether this should be:

   • Private (implementation detail) - current approach is fine
   • Public (part of API) - would allow users to reference it, but probably not necessary

Style Compliance: ✅ Passes

• Trailing newline present in both files ✅
• Code style matches existing patterns ✅
• No linting issues expected (frozen string constant, proper Ruby conventions)

Test Coverage: ✅ Adequate

The existing test suite covers:

• Production fallback for missing environment config ✅
• Normal environment detection still works ✅
• Custom staging environment still works ✅

Security & Performance: ✅ No Issues

No security or performance concerns with this change.

---

Recommendation: ✅ Approve with Minor Suggestion

The code is correct and ready to merge. My only suggestion is to add a changelog entry as noted above, since this fixes user-visible behavior that could affect production deployments.

You can add the changelog entry using:

/update-changelog

Or manually add it to the "Fixed" section under "## [Unreleased]" in CHANGELOG.md.

---

[coderabbitai]

🧹 Nitpick comments (1)

spec/shakapacker/env_spec.rb (1)

20-22: Consider adding a test for the new FALLBACK_ENV constant.

There's an existing test for Shakapacker::DEFAULT_ENV on lines 20-22. Since a new FALLBACK_ENV = "production" constant was introduced in Shakapacker::Env, adding a symmetric assertion would improve test coverage and document the intent.

Suggested addition after line 22

   it "uses 'development' as default env" do
     expect(Shakapacker::DEFAULT_ENV).to eq "development"
   end
+
+  it "uses 'production' as fallback env" do
+    expect(Shakapacker::Env::FALLBACK_ENV).to eq "production"
+  end