Implement Todo Save Functionality with Room Database

[Aflame7121]

Implement Todo Save Functionality with Room Database

Description

Task

Implement method to create and save a new todo item using Room database

Acceptance Criteria

• Can create new todo items
• Validates todo item inputs
• Persists todo items in local database
• Generates unique identifiers
• Supports optional description
• Tracks creation and update timestamps

Summary of Work

This pull request adds the ability to save new todo items to the local Room database with comprehensive validation and error handling.

Changes Made

• Implemented insertTodo() method in TodoDao to persist todo items
• Created addTodo() method in TodoRepository to handle todo item insertion
• Added input validation in Todo data class constructor
• Ensured thread-safe and suspend-based database operations

Implementation Details

1. Data Model (Todo.kt):

   • Added input validation for todo item properties
   • Constraints:
     • Title must be non-blank
     • Title max length: 100 characters
     • Description max length: 500 characters
   • Automatically sets createdAt and updatedAt timestamps
   • Uses autoGenerate primary key for unique item identification

2. Data Access Object (TodoDao.kt):

   • @Insert annotation with REPLACE conflict strategy
   • Suspending function for database insertion
   • Returns the inserted item's ID for tracking

3. Repository Layer (TodoRepository.kt):

   • Provides addTodo() method to abstract database interaction
   • Delegates insertion to DAO
   • Enables dependency injection for easier testing and modularity

Testing Approach

• Input validation covers edge cases
• Checks for blank titles
• Enforces maximum length constraints
• Generates timestamps automatically
• Returns inserted item ID for tracking

Notes

• Coroutine-friendly database operations
• Follows MVVM architectural pattern
• Prepared for future feature expansions

Changes Made

• Implemented Todo save functionality
• Added input validation for Todo items
• Created DAO and Repository methods for todo insertion
• Ensured thread-safe database operations

Tests

• Validate todo item creation
• Check input validation constraints
• Verify database insertion
• Confirm timestamp generation

Signatures

Staking Key

63GuD6KX1ZByaB7nsnCuGZe2HfY4HfcMnHqHhiDXeAdf: 2gtM3EMbm6ZiMQ2W3sTDPDYLmhgj6iHPrWajedKt2LyBPsuPRhiSbgGEFxQ5x2tv2pMa9V1oxTGjmCqfibZrZGVg2jxozVVx57yfak5xxKGktx1rwWchksUhuzKVDKnWn71TCgLjpMegmJHDT64icu8rcg495KruFJniVQmAfoR4DGgxUm1vmCh7Dttas1gXBdC8UnMJwaGyaGs8JUNQC7oRifne9ohkC7urcYaAzidngRCTJAGeMkL7fag97CwHQy8cE9sFtRPgz2bY1gh1w3dC6R77uuKKUrf5uVJFxo6vK3jgQSZvkMYAwqjzfKJvGD1NsZGhmc8rPJXaEbhUqqv9CZZZf61FTw4oYnzEKBawGFePyvriFyVbDVxNGwka15qmRVcNKUhbgFL518KLBbBXUvEs3RN384fW

Public Key

1NifZwcKG5w2PzYmaXHGstHzkrxM7A923ZCswopNvxW: 2SRANuH2ChSrSxoBcVBffNMCZmwqhHPpNvFXJy7bgBKbhhwgvqrvSokXh1bBGqg6vRR4co2Rp654wMpyV1VrEhSx5QFyFSgPFT1x7hQnVsFTFaxRjyddeLLG7VVAco2eMdtEFzFXqkPhdCLp7RmuY5vD9dXq9jsvYAAnCNj1pSUEdPror1yfBa38uRHK24ekyiBhJ7TPue4HRWsA7N9CTVPF4bKx3AHijrQoWwFwXRMMHbkprwbcBQRfMUEYVWF9ou5kQPpz6FWX2ebkAziRy67MaF7kpFyXU4PHtJMMPrREp7iiiAk4babmK3y2wsJaY7tucKyCfxg9YBz4JFrsPuMRt9LyGZUbS4akNuHexoQj1Ruc9B5Zw4iodCJLKVkbksmiZmgHS9gms75yrXFBibtZ5SsjjwS3GNDz