feat(orm): add exists() to QueryBuilder#90
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Adds an async `exists()` method that returns True if any record matches the current query, False otherwise. Delegates to COUNT(*) for efficiency — no model hydration. Supports full chaining: `await User.where(...).exists()`. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
async def exists() -> booltoQueryBuilderCOUNT(*)via the existingaggregate()path — no model hydrationawait User.where("email", x).exists()Changes
builder.py— 4-line addition aftercount(), reusingaggregate("COUNT", "*")test_sqlite_builder_exists.py— 4 new test cases covering True match, False no-match, bare table query, and empty-table caseTest plan
test_exists_returns_true_when_record_matches—where().exists()→Truetest_exists_returns_false_when_no_match—where().exists()→Falsetest_exists_true_with_no_where_clause— barequery().exists()on seeded table →Truetest_exists_false_on_empty_table—query().exists()after wipe →FalseAll 4 pass ✅
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