igmarin/rails-api-versioning
skills/infrastructure/rails-api-versioning/SKILL.md
Implements REST API versioning strategies in Rails, covering URL path versioning, header-based versioning, deprecation policies, and maintaining backward compatibility across versions. Use when adding a new API version (v1, v2), planning API evolution, setting deprecation or sunset policies, or ensuring backward compatibility for existing consumers.
$ install --global
skillsauthnpx skillsauth add igmarin/rails-agent-skills rails-api-versioningInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
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SKILL.md
- name:
- rails-api-versioning
- license:
- MIT
- description:
- >
- version:
- 1.0.0
- user-invocable:
- true
Rails API Versioning
Implement versioning strategies for Rails APIs.
Files: SKILL.md · EXAMPLES.md · references/workflow.md · references/strategies.md
HARD-GATE
ALWAYS maintain backward compatibility for at least one major version
NEVER remove endpoints without deprecation period
ALWAYS version in URL path (/api/v1/) or Accept header, never in body
Quick Reference
| Concern | File |
|---|---|
| Route namespaces | config/routes.rb |
| Header versioning | app/controllers/concerns/api_versioning.rb |
| Deprecation headers | app/controllers/concerns/deprecatable.rb |
| Compatibility specs | spec/requests/api/backward_compatibility_spec.rb |
Versioning Workflow
- Choose strategy — URL path (
/api/v1/) for public APIs; Accept header for internal/private APIs. - Add route namespace — Wrap new version resources in a
namespace :v2block inconfig/routes.rb. - Create controllers — Inherit from the previous version's controller and override only changed actions.
- Apply deprecation — Include
Deprecatablein old-version controllers to emit sunset headers. - Run compatibility specs — Execute
rspec spec/requests/api/backward_compatibility_spec.rbto confirm no regressions. - Update documentation — Record the sunset date and migration guide for deprecated endpoints.
See references/workflow.md for the complete annotated workflow.
Strategies
URL Path Versioning (Recommended)
namespace :v1 do
resources :users
end
namespace :v2 do
resources :users
end
Controller Inheritance
Override only actions that change between versions:
module V2
class UsersController < V1::UsersController
def index
render json: User.all, only: [:id, :name, :email, :phone]
end
end
end
See references/strategies.md for a full URL path vs. Accept header comparison.
Deprecation
Include the Deprecatable concern (defined in app/controllers/concerns/deprecatable.rb) in any controller version due for retirement. It emits Sunset and Deprecation response headers automatically via a before_action.
module V1
class UsersController < ApplicationController
include Deprecatable
# Override sunset_date on the class to set the retirement date:
# def self.sunset_date = Date.new(2025, 6, 1)
end
end
See app/controllers/concerns/deprecatable.rb for the full implementation with logging.
Verification
After adding a new version, always run the backward compatibility suite before merging:
bundle exec rspec spec/requests/api/backward_compatibility_spec.rb
All existing v1 contract tests must remain green; a new version should never silently break prior consumers.
Examples
See EXAMPLES.md for complete code including:
- Controller inheritance patterns
- Deprecatable concern with logging
- Backward compatibility specs
- Client request examples
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