unisono/specs/010-port-the-app/spec.md

Feature Specification: Port the app to Ruby on Rails

Feature Branch: 010-port-the-app
Created: 2025-10-17
Status: Draft
Input: User description: "Port the app to Ruby on Rails, still run it in Docker"

User Scenarios & Testing (mandatory)

User Story 1 - Continued Application Functionality (Priority: P1)

Users can continue to access and use all existing features of the application without interruption or change in behavior after the port to Ruby on Rails.

Why this priority: This is the primary goal of the porting effort – to ensure business continuity and user satisfaction by maintaining all current functionalities.

Independent Test: Can be fully tested by verifying all existing end-to-end user flows and features function correctly.

Acceptance Scenarios:

1. Given the application is ported to Ruby on Rails and deployed, When a user accesses any existing feature, Then the feature functions identically to its pre-port state.
2. Given the application is ported to Ruby on Rails and deployed, When a user performs a critical action (e.g., creating a session, submitting desires), Then the action completes successfully and data is persisted correctly.

Edge Cases

• What happens if existing data migration fails or results in data corruption?
• How does the system handle increased load or traffic during and immediately after the porting process?
• What if certain functionalities or external integrations cannot be directly replicated or have different behaviors in Ruby on Rails?
• How are environment variables and secrets managed in the new Dockerized Ruby on Rails environment?

Requirements (mandatory)

Functional Requirements

• FR-001: The ported application MUST provide all existing functionalities available in the current version. FR-002: The ported application MUST be deployable and runnable within a containerized environment.
• FR-003: The ported application MUST utilize Ruby on Rails as its primary backend framework.
• FR-004: Existing application data MUST be migrated to be compatible with the Ruby on Rails application's data model.
• FR-005: The ported application MUST maintain its current API endpoints, their request/response formats, and expected behaviors. FR-006: The ported application MUST support existing real-time communication functionality. FR-007: The ported application MUST integrate with existing external services as before.

Key Entities (include if feature involves data)

• User: Represents an individual using the application, with associated authentication and session data.
• Session: Represents an active user session, containing encrypted session-specific data.
• Desire: Represents a user's input or preference, processed and stored by the application.

Success Criteria (mandatory)

Measurable Outcomes

**SC-001**: All existing end-to-end tests pass with the ported application, demonstrating functional parity.

• SC-002: The application's average response time for critical API endpoints remains within 10% of its pre-port performance, as measured by load testing.
• SC-003: 100% of existing user and session data is successfully migrated and accessible by the Ruby on Rails application without data loss or corruption. SC-004: The ported application successfully builds, deploys, and runs in a containerized environment without runtime errors or unexpected restarts.
• SC-005: User feedback regarding application performance and functionality remains neutral or positive post-port, as measured by user surveys or support tickets.