Use the resolved model table in belongs_to preload queries

[dchuk]

A belongs_to batch loader derives its SQL table by pluralizing the target class name. For Catalog::Author with self.table_name = "writers", this emits FROM catalog::authors and fails even though the model's selected columns correctly use writers.

Use the resolved target model's table for the batch query. The generic Book/Author fixture deliberately declares a named scope, so it exercises this table-name bug independently of #372. It checks the returned author names and exactly two SQL queries.

Closes #374.

Validation:

• The unpatched reproduction fails with SQLite's unrecognized token: ":" at FROM catalog::authors.
• cargo test --test runtime_preload_target_table -- --include-ignored --nocapture --test-threads=1: 3 passed (CRuby and native Spinel execution, plus a nullable CRuby control).
• bin/rh verify --test preload_scope_relation_delegate --test scope_body_framework_preload_call --test concern_association_foreign_key --json: passed (923 library tests, 1 ignored; 8 related integration tests).
• roundhouse-ast --round-trip on the includes expression: passed.
• git diff --check: passed.

The nullable-author control is CRuby-only: an existing native Spinel case generates a trailing empty element in the IN list. The native regression covers assigned authors. That separate problem is not changed here.

All examples are generic Rails code. Fixtures were generated with the repository scripts. Tested with Ruby 4.0.4, Rust 1.98.1, and Spinel based on 1d26ef67c; other target toolchains were not run locally.

Summary by CodeRabbit

• Bug Fixes
  • Fixed preloading for belongs_to associations when related models are namespaced or use custom table names, so associated records are loaded correctly.
• Tests
  • Added coverage for custom table names, namespaced models, nullable associations, and consistent behavior across supported runtimes.

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• src/emit/ruby/library.rs

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📝 Walkthrough

Walkthrough

belongs_to preload targets now use the table name declared by the resolved target model. Runtime tests cover a namespaced model with a table override, nullable associations, and the expected query count.

Changes

belongs_to preload table resolution

Layer / File(s)	Summary
Resolve the target model table src/emit/ruby/library.rs	preload_targets now uses the resolved target model’s table name. It still skips associations when the target model is absent.
Validate emitted preload behavior tests/runtime_preload_target_table.rs	Runtime tests cover a namespaced model mapped to writers, associated names, exactly two queries, a nullable association, and a Spinel case marked ignored.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix · Severity of issue fixed: Medium

Merge Risk: ⚪ Minimal · up to 13a44

No actionable merge-blocking risk remains for the target-table change after normal checks.

🚥 Pre-merge checks | ✅ 5

✅ 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 clearly summarizes the main change: belongs-to preload queries now use the resolved model table.
Linked Issues check	✅ Passed	Issue #374 requires belongs_to batch preloading to use the resolved target table. preload_targets now finds the target in app.models and uses target_model.table. The regression maps `Catalog::Au…
Out of Scope Changes check	✅ Passed	The whole-PR diff changes belongs_to target-table resolution and adds tests for that behavior. The implementation and tests support issue #374. No unrelated changes appear in the diff.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 5 functions across 2 files.

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Inline comments:
Review comments at @tests/runtime_preload_target_table.rs:
- Line 30: Update the books_for_list query to use Book.ordered before filtering
and including authors, so the asserted author order is deterministic.

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