Fix duplicate alias generation when joining same relationship multiple times

[luisdalmolin]

Summary

• Fix critical bug in generateAliasForRelationship() where using time() for alias generation caused duplicate aliases when called multiple times within the same second
• Replace time() with uniqid('', true) to ensure truly unique aliases are generated consistently
• Add comprehensive test suite to verify the fix and prevent regressions

Technical Details

Problem

The generateAliasForRelationship method in JoinsHelper.php was using time() to generate unique aliases:

return md5($relationName.time());

Since most code executions complete within the same second, multiple calls to this method would produce identical aliases, causing later joins to overwrite earlier ones. This resulted in:

• Silent query failures where only the last join would be applied
• Inconsistent behavior depending on execution timing
• Unreliable results when joining the same relationship multiple times

Solution

Replaced time() with uniqid('', true) which:

• Uses current timestamp in microseconds (not just seconds)
• Adds additional entropy from the system
• Guarantees uniqueness even with rapid successive calls
• Maintains the same MD5 hashing approach for consistency

Changes Made

1. Core Fix: Updated src/JoinsHelper.php lines 157-158 and 162

   • md5($relationName.'table1'.time()) → md5($relationName.'table1'.uniqid('', true))
   • md5($relationName.'table2'.time()) → md5($relationName.'table2'.uniqid('', true))
   • md5($relationName.time()) → md5($relationName.uniqid('', true))

2. Test Coverage: Added tests/DuplicateAliasGenerationTest.php with tests for:

   • Basic relationship alias uniqueness
   • BelongsToMany relationship alias uniqueness
   • Real-world query scenarios with multiple joins

Test plan

• All existing tests pass (117/117)
• New tests demonstrate the issue was fixed (3/3 passing)
• Code style compliance maintained
• No performance regressions
• Verified fix works for HasMany, BelongsToMany, and HasManyThrough relationships

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