refactor(codegen/adapter): consume RawQuery.encode via runtime.prepare

[nao1215]

Summary

Rework the native pog / sqlight adapter codegen so generated query functions consume the same RawQuery.encode pipeline that powers runtime.prepare. Each adapter file now declares a single value_to_<driver> helper, and every query function walks the encoded List(Value) through list.fold, eliminating the per-parameter driver encoding calls and the ad-hoc slice expansion logic.

Changes

• src/sqlode/codegen/adapter.gleam
  • Emit value_to_pog / value_to_sqlight helper at the top of the file, mapping runtime.Value → driver Value
  • New render_prepare_lines helper centralises the runtime.prepare(q, p) + list.fold scaffolding
  • Rewrite render_pog_query_call / render_pog_exec_last_id / render_sqlight_query_call / render_sqlight_exec_last_id to use the helper
  • Delete render_param_value_expr, render_list_param_value_expr, render_slice_expansion_line, render_pog_params_simple, render_pog_params_with_slices, render_sqlight_params_simple, render_sqlight_params_with_slices
  • Gate gleam/list import on has_params instead of has_slices
• test/codegen_test.gleam
  • Update assertions for the new prepare + fold shape
  • Flip enum/array expectations: models.status_to_string(v) / pog.array(pog.text) now live in the params module, not the adapter

Design Decisions

• A single value_to_<driver> helper per adapter file keeps the generated code small and recursive array support is a natural one-liner (pog.array(value_to_pog, vs)).
• Slice expansion is already handled by runtime.prepare, so the adapter layer only needs to fold the resulting List(Value); this removes a large amount of conditional rendering.
• Enum → string conversion and array encoding now belong to the params module output, so the adapter stays driver-agnostic and does not re-encode.

Limitations

• sqlight has no native array type, so SqlArray falls through to sqlight.null() in value_to_sqlight. Array support for SQLite remains a separate concern.

Closes #299

Summary by CodeRabbit

• Refactor
  • Updated SQL adapter code generation to use a unified parameter binding approach with driver-specific value conversion helpers.
  • Simplified parameter handling by removing placeholder expansion logic in favor of a prepare-and-fold pattern.
  • Updated test assertions to reflect the new code generation structure.

[coderabbitai]

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Free

Run ID: 0128140c-66c7-4727-ab9a-4d847c2ef1af

📥 Commits

Reviewing files that changed from the base of the PR and between 2620685 and 552ce0c.

📒 Files selected for processing (2)

• src/sqlode/codegen/adapter.gleam
• test/codegen_test.gleam

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📝 Walkthrough

Walkthrough

The pull request refactors SQLode's adapter code generation, replacing slice placeholder expansion with a new runtime.prepare approach. It introduces per-adapter value-to-driver conversion helpers within the AdapterConfig and consolidates parameter binding into unified fold/map operations over a values list, removing prior per-parameter expression generation logic.

Changes

Cohort / File(s)	Summary
Adapter Rendering Refactor src/sqlode/codegen/adapter.gleam	Added value_to_driver_helper field to AdapterConfig. Reworked render_pog_query_call, render_pog_exec_last_id, render_sqlight_query_call, and render_sqlight_exec_last_id to use runtime.prepare(q, p) and fold/map operations over values instead of slice placeholder expansion. Removed render_param_value_expr, render_list_param_value_expr, and render_slice_expansion_line helper functions. Updated import gleam/list logic to depend on has_params rather than slice usage.
Test Assertion Updates test/codegen_test.gleam	Updated adapter rendering assertions to expect runtime.prepare(q, p) calls and unified fold/map parameter binding patterns. Changed enum slice conversion expectations from per-parameter stringification to adapter-level helper invocations. Updated array-columns tests to expect recursive helper patterns instead of per-type pog.array(pog.*) calls.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Poem

🐰 Old placeholders fade away,
prepare and helpers save the day,
A fold, a map, so clean and bright,
Parameter binding now feels right! ✨

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