Decode Action Cable broadcasts

[cardmagic]

Summary

• decode Action Cable payloads before Solid Objects parses observable invalidations
• restore raw Turbo Stream delivery for scalar observables and component refreshes
• add a regression across the broadcast encoder and custom channel callback boundary
• prepare version 0.4.2

Root cause

ActionCable.server.broadcast JSON-encodes messages by default. Rails only applies its default JSON decoder when stream_from uses the built-in retransmitter; a custom callback defaults to coder: nil.

SolidObjects::ActorChannel needs a custom callback for observable filtering and component invalidation, so it now follows Rails' documented callback pattern with coder: ActiveSupport::JSON.

Validation

• encoded-payload regression: 1 test, 4 assertions
• complete channel suite: 13 tests, 42 assertions
• bundle exec rake: 211 tests, 823 assertions
• Standard Ruby and Solid Queue RuboCop passed
• generated RBS validation and Steep passed
• Brakeman reported zero warnings
• packaged gem reports version 0.4.2

No database migration is required.

[greptile-apps]

Greptile Summary

The PR fixes Action Cable delivery by decoding JSON-encoded broadcasts before observable invalidation processing and bumps the gem to version 0.4.2.

• Configures ActorChannel streams with ActiveSupport::JSON.
• Adds an integration regression covering the broadcast encoder and custom callback boundary.
• Updates the changelog, version constant, and lockfile metadata.

Confidence Score: 5/5

The PR appears safe to merge with no actionable defects identified.

The channel now decodes the JSON representation produced by Action Cable before applying existing invalidation parsing, and the regression covers both scalar updates and component refreshes across that boundary.

Important Files Changed

Filename	Overview
lib/solid_objects/actor_channel.rb	Adds the JSON coder required to decode Action Cable broadcasts before the custom callback processes them.
test/integration/actor_channel_test.rb	Adds a focused regression that captures the stream coder and verifies scalar and component transmissions remain raw Turbo Stream HTML.
lib/solid_objects/version.rb	Bumps the gem version from 0.4.1 to 0.4.2.
CHANGELOG.md	Documents the Action Cable payload-decoding fix in the 0.4.2 release.
Gemfile.lock	Synchronizes the locked local gem version with 0.4.2.

Sequence Diagram

sequenceDiagram
  participant Adapter as Broadcast Adapter
  participant AC as Action Cable
  participant Channel as ActorChannel
  participant Client as Subscriber
  Adapter->>AC: broadcast Turbo Stream HTML
  AC->>AC: JSON-encode payload
  AC->>Channel: deliver encoded payload
  Channel->>Channel: ActiveSupport::JSON.decode
  Channel->>Channel: parse invalidation metadata
  Channel->>Client: transmit raw Turbo Stream HTML

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_{Reviews (1): Last reviewed commit: "chore: prepare 0.4.2 release" | Re-trigger Greptile}