# BaseController Implementation Checklist

## Abstract Class Setup

- [ ] BaseController abstract class created in `shared/core/`
- [ ] Generic type parameter `<T>` properly defined
- [ ] Database client abstraction implemented
- [ ] Zod schema integration configured
- [ ] Constructor properly initializes dependencies

## CRUD Operations Implementation

- [ ] `getAll` method implemented with pagination
- [ ] `getById` method implemented with proper error handling
- [ ] `create` method implemented with validation
- [ ] `update` method implemented with partial updates
- [ ] `delete` method implemented with proper checks
- [ ] All methods return proper HTTP responses

## Search & Filtering

- [ ] Abstract `buildSearchFilter` method defined
- [ ] Search parameter extraction implemented
- [ ] Database-agnostic filter pattern established
- [ ] Query string parsing handled properly
- [ ] Default search behavior defined
- [ ] Search performance considered

## Validation & Schema Integration

- [ ] Zod schema validation on all inputs
- [ ] Create schema validation implemented
- [ ] Update schema validation implemented
- [ ] Search parameter validation implemented
- [ ] Custom validation rules supported
- [ ] Validation error messages are user-friendly

## Error Handling

- [ ] Consistent error response format
- [ ] HTTP status codes properly used
- [ ] Validation errors properly formatted
- [ ] Database errors caught and handled
- [ ] Logging implemented for debugging
- [ ] Error messages don't expose sensitive data

## Database Abstraction

- [ ] Database client interface defined
- [ ] Connection management abstracted
- [ ] Database-specific operations isolated
- [ ] ORM/ODM integration patterns established
- [ ] Transaction support considered
- [ ] Connection pooling handled

## Response Formatting

- [ ] Consistent API response structure
- [ ] Success responses properly formatted
- [ ] Error responses standardized
- [ ] Pagination metadata included
- [ ] Response types properly typed
- [ ] Content-Type headers set correctly

## Feature Controller Extension

- [ ] Feature controller extends BaseController
- [ ] Entity-specific `buildSearchFilter` implemented
- [ ] Custom business logic methods added
- [ ] Database client properly injected
- [ ] Schema properly passed to parent
- [ ] Controller singleton pattern implemented (if needed)

## Type Safety

- [ ] Generic types properly constrained
- [ ] Entity model interfaces defined
- [ ] API response types defined
- [ ] Database model types defined
- [ ] Method signatures properly typed
- [ ] Return types explicitly defined

## Performance Optimization

- [ ] Database queries optimized
- [ ] Proper indexing strategy planned
- [ ] Pagination limits enforced
- [ ] Query result caching considered
- [ ] N+1 query problems avoided
- [ ] Database connection reuse implemented

## Testing

- [ ] Unit tests for BaseController methods
- [ ] Mock database client created
- [ ] Test data fixtures defined
- [ ] Edge cases covered in tests
- [ ] Error scenarios tested
- [ ] Performance tests implemented

## Documentation

- [ ] BaseController usage documented
- [ ] Extension patterns documented
- [ ] Database integration examples provided
- [ ] API response formats documented
- [ ] Error handling patterns documented
- [ ] Performance considerations documented

## Logging & Monitoring

- [ ] Request/response logging implemented
- [ ] Error logging with stack traces
- [ ] Performance metrics captured
- [ ] Database operation monitoring
- [ ] Health check endpoints created
- [ ] Audit trail for data changes

## Security Considerations

- [ ] Input sanitization implemented
- [ ] SQL injection prevention (for SQL databases)
- [ ] NoSQL injection prevention (for NoSQL databases)
- [ ] Access control integration points
- [ ] Rate limiting consideration
- [ ] Sensitive data handling

## Database-Specific Implementations

### For SQL Databases (Prisma/TypeORM)

- [ ] Proper WHERE clause generation
- [ ] JOIN operations handled
- [ ] Transaction support implemented
- [ ] Migration compatibility ensured
- [ ] Relationship loading optimized

### For MongoDB (Mongoose)

- [ ] Query object generation
- [ ] Aggregation pipeline support
- [ ] Index utilization optimized
- [ ] Document validation aligned
- [ ] Connection string security

### For Serverless Databases

- [ ] Connection pooling optimized
- [ ] Cold start mitigation
- [ ] Query timeout handling
- [ ] Retry logic implemented
- [ ] Cost optimization considered

## Integration Points

- [ ] Authentication middleware integration
- [ ] Authorization checks implemented
- [ ] Audit logging integrated
- [ ] Event system integration (if applicable)
- [ ] Cache layer integration
- [ ] External API integration patterns

## Production Readiness

- [ ] Environment variable configuration
- [ ] Production database connection
- [ ] Error monitoring integration
- [ ] Performance monitoring setup
- [ ] Load testing completed
- [ ] Backup and recovery procedures