📈 Alias anonymous user with the user

[lukevella]

Summary by CodeRabbit

• Improvements
  • Enhanced user tracking by associating guest user IDs with the primary user account
  • Updated transaction handling for user merging process

Note: These changes are primarily backend improvements that do not directly impact the user interface.

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[coderabbitai]

Walkthrough

The pull request modifies the mergeGuestsIntoUser function in the authentication merge process. The key changes involve removing the return statement from the Prisma transaction and adding a PostHog alias method call after the transaction. This adjustment changes the function's behavior by removing the transaction result return and introducing a new user tracking side effect that associates the primary user ID with a guest user ID.

Changes

File	Change Summary
apps/web/src/auth/merge-user.ts	- Removed return statement from prisma.$transaction - Added posthog.alias() method call after transaction

Sequence Diagram

sequenceDiagram
    participant User as Registered User
    participant Guest as Guest User
    participant Prisma as Prisma Transaction
    participant PostHog as PostHog Tracking

    User->>Guest: Merge Guest Users
    Guest->>Prisma: Execute User Merge Transaction
    Prisma-->>Guest: Transaction Complete
    Guest->>PostHog: Alias User Tracking

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Possibly related PRs

• ♻️ Move auth #1422: Modifications to the mergeGuestsIntoUser function's control flow
• 🐛 Fix data migration for social sign on #1474: Updates to signIn callback including mergeGuestsIntoUser
• 🐛 Prevent crash when merging users #1476: Simplification of guest user merging logic

Poem

🐰 Merging guests with coding grace,
A transaction without a trace,
PostHog tracks with gentle might,
User journeys take their flight,
Rabbit's code, a seamless race! 🚀

---

📜 Recent review details

Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between dc608d6 and b54ba05.

📒 Files selected for processing (1)

• apps/web/src/auth/merge-user.ts (2 hunks)

🧰 Additional context used

📓 Learnings (1)

apps/web/src/auth/merge-user.ts (1)

Learnt from: lukevella
PR: lukevella/rallly#1189
File: apps/web/src/utils/auth.ts:202-202
Timestamp: 2024-11-12T09:08:14.221Z
Learning: The `mergeGuestsIntoUser()` function in `apps/web/src/utils/auth.ts` is correctly awaited.

⏰ Context from checks skipped due to timeout of 90000ms (4)

• GitHub Check: Unit tests
• GitHub Check: Integration tests
• GitHub Check: Linting
• GitHub Check: Type check

🔇 Additional comments (4)

apps/web/src/auth/merge-user.ts (4)

2-2: LGTM: PostHog import added for user aliasing.

The import is correctly placed and uses the server-side PostHog instance.

---

Line range hint 10-48: LGTM: Transaction logic is sound and efficient.

The transaction correctly handles the atomic update of guest references across all relevant tables. The use of Promise.all for concurrent updates is a good performance optimization.

---

Line range hint 1-53: Verify complete guest user handling across the codebase.

Let's ensure all guest user references are properly handled and identify any similar patterns that might need updating.

✅ Verification successful

Guest user handling implementation is complete and consistent

The codebase shows a thorough and consistent approach to guest user management:

• All relevant entities (polls, participants, comments) properly handle guest IDs
• User merging is atomic and handles all cases
• Analytics tracking and error handling are properly integrated

🏁 Scripts executed

The following scripts were executed for the analysis:

Script:

#!/bin/bash
# Check for other guest ID references and similar patterns

# Look for other guest ID references in database operations
echo "Checking for guest ID references in database operations..."
rg "guestId" --type ts

# Look for other PostHog alias usage
echo "Checking for other PostHog alias usage..."
rg "posthog.*alias" --type ts

# Look for similar user merging patterns
echo "Checking for similar user merging patterns..."
rg "merge.*User|user.*merge" --type ts

Length of output: 3017

---

49-49: Consider error handling and multiple guest IDs.

The PostHog aliasing has several potential issues to address:

1. The alias call could execute even if the transaction fails
2. Only the first guestId is being aliased, potentially losing tracking continuity for other guest IDs
3. PostHog call failures aren't handled

Consider wrapping the alias call in the try block and handling multiple guest IDs:

    await prisma.$transaction(async (tx) => {
      // ... existing transaction code ...
    });
-    posthog?.alias({ distinctId: userId, alias: guestIds[0] });
+    // Alias all guest IDs to maintain complete user journey
+    try {
+      await Promise.all(
+        guestIds.map((guestId) =>
+          posthog?.alias({ distinctId: userId, alias: guestId })
+        )
+      );
+    } catch (error) {
+      // Log PostHog error but don't fail the merge
+      console.error('Failed to alias user in PostHog:', error);
+      Sentry.captureException(error, {
+        tags: { context: 'posthog_alias' },
+      });
+    }

✨ Finishing Touches

• 📝 Generate Docstrings (Beta)

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