generate-rails-openapi

name	generate-rails-openapi
description	Generate or update the OpenAPI specification from the Rails application tests (specs). Use when you need to synchronize the public API contract with the actual implementation in the Rails service.

Generate Rails OpenAPI

Use this skill to automatically generate an OpenAPI specification by running the RSpec integration tests. This ensures that the documentation accurately reflects the behavior of the API.

Required Inputs

• Rails application directory (rails-app)
• Integration tests (request specs) in spec/requests/
• rswag gems (rswag-api, rswag-ui, rswag-specs) installed in the Rails app

Workflow

1. Ensure dependencies are installed:

   cd rails-app
   bundle install
   

2. Run tests with OpenAPI generation: Execute the RSpec tests using the Rswag task. This will run the specs and generate the Swagger file based on the path, post, response, etc. blocks.

   cd rails-app
   # Generate Swagger documentation
   bundle exec rake rswag:specs:swaggerize
   

3. Locate the generated spec: By default, the spec is generated at swagger/v1/swagger.yaml (as configured in spec/swagger_helper.rb).

4. Review: Review the generated swagger.yaml to ensure it correctly captures the API behavior.

Repository Configuration

• Gem: rswag is used to capture request/response data and generate the UI.

• Helper: spec/swagger_helper.rb configures the output path and global metadata (title, version, servers).

• Test Inclusion: Ensure request specs use type: :request and follow the Rswag DSL.

  # spec/requests/api/v0/my_spec.rb
  
  require 'swagger_helper'
  
  RSpec.describe 'api/v0/my_resource', type: :request do
    path '/api/v0/my_resource' do
      post 'Creates a resource' do
        tags 'MyResource'
        consumes 'application/json'
        parameter name: :resource, in: :body, schema: { ... }
  
        response '201', 'resource created' do
          run_test!
        end
      end
    end
  end
  
  

Troubleshooting

• No examples found: Ensure you are running rake rswag:specs:swaggerize and that your specs use the Rswag DSL (path, response, etc.).

• Database Errors: Ensure a test database is available or mocked. The app may require AWS_REGION and DB_IAM_AUTH=false for local tests.

• Schema Drift: We use a shared example swagger_schema_drift_detection to ensure models and their to_swagger_schema definitions stay in sync. Run these via:

  bundle exec rspec spec/models