resources :name, path: "segment" serves the resource at the segment

[eddygarcas]

Probed with roundhouse --version: roundhouse 2026.9.18 (7fad14c0), Linux x86_64, Rails 8.1.4 (actionpack) as the reference.

resources :name, path: "segment" was ingested without its path: option, so the resource was served at /name and the declared URL answered 404.

resources :parts, path: "/components", only: %i[index show]
resources :widgets, path: "gadgets", only: %i[show] do
  member { get :archive }
  resources :parts, only: %i[index]
end

Rails 8.1 (bin/rails routes):

        Prefix Verb URI Pattern                         Controller#Action
         parts GET  /components(.:format)               parts#index
          part GET  /components/:id(.:format)           parts#show
archive_widget GET  /gadgets/:id/archive(.:format)      widgets#archive
  widget_parts GET  /gadgets/:widget_id/parts(.:format) parts#index
        widget GET  /gadgets/:id(.:format)              widgets#show

Emitted on main (7fad14c, --target spinel):

Route.new("GET", "/parts", :parts, :index)
Route.new("GET", "/parts/:id", :parts, :show)

Fix

path: is the opposite of as:: it moves the URL segment and leaves the helpers and the controller on the name. RouteSpec::Resources gets an optional path (serde-defaulted, like param). The ingester reads it with its slashes trimmed (Rails serves path: "/components" and path: "components" at the same URL), and the flattener's nesting frame keeps the path segment apart from the plural it uses for helper names. That way member, collection and nested routes sit under the new segment and keep their names.

A path: with a dynamic segment (path: "categories/:category_id/parts"), a glob or an optional group is reported as unsupported at ingest: the flattener would otherwise serve it without passing :category_id into the route params. Carrying those params is a follow-up.

An empty path: (path: "" or path: "/") is reported as unsupported too. Rails mounts the resource at the root then (GET / is parts#index, GET /:id is parts#show, checked on actionpack 8.1.4), and falling back to /parts would serve the wrong URL.

Tests

tests/route_resources_path_option.rs:

• two flatten_routes tests check the table above: the top-level resource, plus a member route and a nested resource under a renamed parent. They fail on main, where the routes come out at /parts and /widgets/….
• emitted_router_serves_the_resource_at_its_path emits real-blog with resources :articles, path: "posts" and dispatches through the emitted RouteTable.table on CRuby. GET /posts, GET /posts/42 and POST /posts/42/comments reach their actions, /articles is gone, and RouteHelpers.article_path(42) is /posts/42. It fails on main (no route for GET /posts).
• non_literal_path_is_unsupported_not_the_resource_name: path: PARTS_SEGMENT and path: segment_for(:parts) are reported as unsupported instead of being served at /parts.
• dynamic_segment_path_is_unsupported_not_served_without_its_param: path: "categories/:category_id/parts", "files/*rest" and "parts(/:kind)" are reported as unsupported. It fails without the ingest check, where the path is accepted.
• empty_path_is_unsupported_not_the_resource_name: path: "", "/" and "//" are reported as unsupported. It fails without the check, where the resource is ingested at /parts.

All six pass with the change. docs/data/schema-routes-seeds.md now lists path: with the other resources options.

Full suite (cargo test --release --no-fail-fast) on this machine, on main at 37bddda (current main, 65cc85c, has not touched these files): 3273 passed, 2 failed, 116 ignored. Neither failure comes from this change. the_store_fixture_checks_clean needs the generated store fixture, and resource_and_unit_batch_helpers_preserve_failures_and_contracts runs a CI resource-sampling script that errors on this host; both fail the same way on main here. The date-dependent use_zone_answers_like_activesupport_* failures are fixed on main by #368 and pass here.

Sibling routing PR: #365 also touches src/ingest/routes.rs (match … via:). git merge-tree reports the two clean against each other; the rebase onto current main was clean.

Found while compiling a Rails API app with --target spinel.

🤖 Generated with Claude Code

Summary by CodeRabbit

• New Features
  • Resource routes now support a custom URL path while keeping helper and controller names based on the resource name. Member and nested routes follow the configured path.
  • Custom paths must be literal and cannot contain dynamic segments or normalize to an empty path; unsupported values are rejected.
• Documentation
  • Clarified that route options such as controller: and param: accept strings or symbols.

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📝 Walkthrough

Walkthrough

Resource declarations now accept a path: option for URL segments. Route lowering applies the custom segment to resource and nested paths while retaining the resource name for helper and controller naming.

Changes

Resource path option

Layer / File(s)	Summary
Capture the resource path option src/dialect.rs, src/ingest/routes.rs, docs/data/schema-routes-seeds.md	RouteSpec::Resources stores the parsed path: value. Ingestion accepts literal strings and symbols, trims surrounding slashes, and rejects non-literal values, dynamic-segment paths, and paths that normalize to empty. The route-seed documentation includes path: and describes supported spellings.
Apply custom segments during route lowering src/lower/routes.rs, tests/route_resources_path_option.rs	Route lowering uses the custom segment for resource and nested URL paths while preserving resource names for helpers and controllers. Tests check route names, paths, controller actions, emitted router matches, and rejected path values.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix

Sequence Diagram(s)

sequenceDiagram
  participant Declaration as Route declaration
  participant Ingest as Route ingestion
  participant Spec as RouteSpec::Resources
  participant Lowering as Route lowering
  participant Router as Emitted router
  Declaration->>Ingest: Pass resources options
  Ingest->>Spec: Store normalized path
  Spec->>Lowering: Provide resource path
  Lowering->>Router: Emit routes with custom URL segments

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Suggested reviewers: matheusrich

Merge Risk: ⚪ Minimal · up to 3b382

Resource declarations with a literal path: option now serve routes at the declared segment, with helper and controller names unchanged. Unsupported values (non-literal, dynamic or root-mounting) fail clearly at ingestion rather than producing wrong routes. No merge-blocking concerns remain.

Security Architecture Review

Security architecture risk: 🔵 Low · up to 3b382

The change preserves controller identity, action restrictions, and parameter bindings while applying explicitly configured URLs. No introduced security bypass was established. Production authorization and path-based access policies were not available, so the security effect of relocating deployed endpoints remains uncertain.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

• inferred — The supported exposure change is relocation of declared resource endpoints and their nested URLs in generated applications. An affected application's scope depends on its route declarations; the supplied evidence does not establish tenant-wide, data-store, credential, or infrastructure authority expansion.

Trust Boundaries and Controls

• inferred — The inspected override originates in route source configuration, not an incoming request. It changes request matching locations without selecting a different controller or widening the resource action filter. This bounds the configuration-to-router transition but does not prove preservation of external URL-based access policies.

Hardening Proposals

• proposed — For deployments with URL-based gateway or middleware restrictions, validate that those restrictions cover the configured resource path and nested URLs before regenerating and deploying the application. This is a deployment precaution, not an observed bypass.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 75.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 12 functions across 4 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the main change: honoring a resource's path: option when serving its routes.

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Inline comments:
Review comments at @src/ingest/routes.rs:
- Around line 1240-1249: Update the `path` branch in the route-options function
to return `IngestError::Unsupported` when `symbol_or_string_value` cannot
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🟠 Major · Include dynamic override segments in route parameters. · routes.rs:531

src/lower/routes.rs:531
🎯 Functional Correctness | 🟠 Major | ⚡ Quick win

Include dynamic override segments in route parameters.

If resources :parts, path: "categories/:category_id/parts" is ingested, this code puts :category_id in FlatRoute.path. Resource-action parameter assembly does not put it in FlatRoute.path_params. Nested routes also omit it because nest_path collects parent identifiers only. As a result, generated helpers cannot substitute the required segment. Derive parameters from each complete route path in URL order, including the override, and test resource and nested helpers with a dynamic path: prefix. Rails documents path: as a resource path prefix and supports dynamic URL segments. (api.rubyonrails.org)

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Review comment at @src/lower/routes.rs at line 531:
Update route parameter assembly around `segment` in the route ingestion flow to
derive `FlatRoute.path_params` from the complete route path in URL order,
including dynamic segments introduced by a resource `path:` override. Ensure
this also covers nested routes so generated helpers can substitute every
required segment.

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Outside diff comments:
Review comments at @src/lower/routes.rs:
- Line 531: Update route parameter assembly around `segment` in the route
ingestion flow to derive `FlatRoute.path_params` from the complete route path in
URL order, including dynamic segments introduced by a resource `path:` override.
Ensure this also covers nested routes so generated helpers can substitute every
required segment.

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[eddygarcas]

On the outside-diff item at src/lower/routes.rs:531 (dynamic segments in path:): a path: containing :, * or ( is now rejected at ingest as unsupported (dynamic_segment_path_is_unsupported_not_served_without_its_param), so it is no longer served without its param. Carrying those segments into the route params is left as a follow-up.

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Inline comments:
Review comments at @src/ingest/routes.rs:
- Line 1266: Update the resource path handling around `raw.trim_matches('/')` to
distinguish an explicitly supplied empty path from an absent path. Preserve the
empty override through lowering when representable; otherwise return
`Unsupported` instead of converting it to `None` and falling back to the default
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