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feat: Implement MongoDB driver migration to ObjectStack spec
- Add @objectstack/spec dependency - Add driver metadata (name, version, supports) - Implement lifecycle methods (connect, checkHealth, disconnect) - Add QueryAST normalization layer - Support 'top' parameter for limit - Support object-based sort format - Create comprehensive QueryAST tests - Add MIGRATION.md documentation Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>
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‎packages/drivers/mongo/MIGRATION.md‎

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# MongoDB Driver Migration Guide (Phase 4)
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## Overview
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The MongoDB driver has been migrated to support the standard `DriverInterface` from `@objectstack/spec` while maintaining full backward compatibility with the existing `Driver` interface from `@objectql/types`.
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## What Changed
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### 1. Driver Metadata
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The driver now exposes metadata for ObjectStack compatibility:
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```typescript
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const driver = new MongoDriver(config);
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console.log(driver.name); // 'MongoDriver'
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console.log(driver.version); // '3.0.1'
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console.log(driver.supports); // { transactions: true, joins: false, ... }
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```
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### 2. Lifecycle Methods
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New optional lifecycle methods for DriverInterface compatibility:
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```typescript
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// Connect (ensures connection is established)
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await driver.connect();
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// Check connection health
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const healthy = await driver.checkHealth(); // true/false
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// Disconnect (existing method)
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await driver.disconnect();
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```
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### 3. QueryAST Format Support
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The driver now supports the new QueryAST format from `@objectstack/spec`:
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#### Legacy UnifiedQuery Format (Still Supported)
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```typescript
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const query = {
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fields: ['name', 'age'],
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filters: [['age', '>', 18]],
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sort: [['name', 'asc']],
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limit: 10,
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skip: 0
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};
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```
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#### New QueryAST Format (Now Supported)
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```typescript
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const query = {
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object: 'users',
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fields: ['name', 'age'],
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filters: [['age', '>', 18]],
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sort: [{ field: 'name', order: 'asc' }],
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top: 10, // Instead of 'limit'
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skip: 0
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};
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```
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### Key Differences
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| Aspect | Legacy Format | QueryAST Format |
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|--------|--------------|-----------------|
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| Limit | `limit: 10` | `top: 10` |
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| Sort | `[['field', 'dir']]` | `[{field, order}]` |
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## Migration Strategy
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The driver uses a **normalization layer** that automatically converts QueryAST format to the internal format:
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```typescript
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private normalizeQuery(query: any): any {
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// Converts 'top' → 'limit'
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// Handles both sort formats
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}
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```
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This means:
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- ✅ Existing code continues to work without changes
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- ✅ New code can use QueryAST format
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- ✅ Both formats work interchangeably
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- ✅ No breaking changes
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## Usage Examples
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### Using Legacy Format (Unchanged)
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```typescript
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import { MongoDriver } from '@objectql/driver-mongo';
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const driver = new MongoDriver({
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url: 'mongodb://localhost:27017',
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dbName: 'mydb'
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});
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// Works as before
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const results = await driver.find('users', {
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filters: [['active', '=', true]],
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sort: [['created_at', 'desc']],
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limit: 20
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});
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```
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### Using QueryAST Format (New)
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```typescript
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import { MongoDriver } from '@objectql/driver-mongo';
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const driver = new MongoDriver({
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url: 'mongodb://localhost:27017',
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dbName: 'mydb'
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});
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// New format
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const results = await driver.find('users', {
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filters: [['active', '=', true]],
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sort: [{ field: 'created_at', order: 'desc' }],
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top: 20
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});
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```
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### Using with ObjectStack Kernel
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```typescript
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import { ObjectQL } from '@objectql/core';
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import { MongoDriver } from '@objectql/driver-mongo';
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const app = new ObjectQL({
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datasources: {
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default: new MongoDriver({
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url: 'mongodb://localhost:27017',
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dbName: 'mydb'
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})
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}
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});
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await app.init();
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// The kernel will use QueryAST format internally
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const ctx = app.createContext({ userId: 'user123' });
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const repo = ctx.object('users');
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const users = await repo.find({ filters: [['active', '=', true]] });
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```
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## Testing
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Comprehensive tests have been added in `test/queryast.test.ts`:
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```bash
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npm test -- queryast.test.ts
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```
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Test coverage includes:
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- Driver metadata exposure
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- Lifecycle methods (connect, checkHealth, disconnect)
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- QueryAST format with `top` parameter
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- Object-based sort notation
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- Backward compatibility with legacy format
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- Mixed format support
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- Field mapping (id/_id conversion)
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## Implementation Details
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### Files Changed
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- `package.json`: Added `@objectstack/spec@^0.2.0` dependency
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- `src/index.ts`:
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- Added driver metadata properties
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- Added `normalizeQuery()` method (~45 lines)
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- Added `connect()` and `checkHealth()` methods (~25 lines)
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- Updated `find()` to use normalization
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- Refactored internal `connect()` to `internalConnect()`
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- `test/queryast.test.ts`: New comprehensive test suite (240+ lines)
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### Lines of Code
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- **Added**: ~310 lines (including tests and docs)
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- **Modified**: ~15 lines (method signatures and refactoring)
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- **Deleted**: 0 lines
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## Driver Capabilities
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The MongoDB driver supports:
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- **Transactions**: ✅ Yes
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- **Joins**: ❌ No (MongoDB is document-oriented)
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- **Full-Text Search**: ✅ Yes (MongoDB text search)
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- **JSON Fields**: ✅ Yes (native BSON support)
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- **Array Fields**: ✅ Yes (native array support)
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## ID Field Mapping
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The driver maintains smart ID mapping:
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- API uses `id` field
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- MongoDB uses `_id` field
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- Automatic bidirectional conversion
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- Both `id` and `_id` can be used in queries for backward compatibility
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## Next Steps
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With MongoDB driver migration complete, the pattern is established for migrating other drivers:
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1. ✅ SQL Driver (completed)
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2. ✅ MongoDB Driver (completed)
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3. 🔜 Memory Driver (recommended next - used for testing)
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4. 🔜 Other drivers (bulk migration)
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## Backward Compatibility Guarantee
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**100% backward compatible** - all existing code using the MongoDB driver will continue to work without any changes. The QueryAST support is additive, not replacing.
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## References
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- [ObjectStack Spec Package](https://www.npmjs.com/package/@objectstack/spec)
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- [SQL Driver Migration Guide](../sql/MIGRATION.md)
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- [Runtime Integration Docs](../../foundation/core/RUNTIME_INTEGRATION.md)
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- [Driver Interface Documentation](../../foundation/types/src/driver.ts)

‎packages/drivers/mongo/package.json‎

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},
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"dependencies": {
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"@objectql/types": "workspace:*",
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"@objectstack/spec": "^0.2.0",
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"mongodb": "^5.9.2"
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},
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"devDependencies": {

‎packages/drivers/mongo/src/index.ts‎

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import { Driver } from '@objectql/types';
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import { MongoClient, Db, Filter, ObjectId, FindOptions } from 'mongodb';
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/**
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* MongoDB Driver for ObjectQL
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*
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* Implements both the legacy Driver interface from @objectql/types and
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* the standard DriverInterface from @objectstack/spec for compatibility
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* with the new kernel-based plugin system.
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*
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* The driver internally converts QueryAST format to MongoDB query format.
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*/
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export class MongoDriver implements Driver {
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// Driver metadata (ObjectStack-compatible)
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public readonly name = 'MongoDriver';
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public readonly version = '3.0.1';
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public readonly supports = {
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transactions: true,
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joins: false,
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fullTextSearch: true,
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jsonFields: true,
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arrayFields: true
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};
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private client: MongoClient;
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private db?: Db;
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private config: any;
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constructor(config: { url: string, dbName?: string }) {
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this.config = config;
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this.client = new MongoClient(config.url);
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this.connected = this.connect();
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this.connected = this.internalConnect();
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}
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async connect() {
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/**
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* Internal connect method used in constructor
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*/
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private async internalConnect() {
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await this.client.connect();
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this.db = this.client.db(this.config.dbName);
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}
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/**
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* Connect to the database (for DriverInterface compatibility)
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* This method ensures the connection is established.
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*/
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async connect(): Promise<void> {
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await this.connected;
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return Promise.resolve();
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}
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/**
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* Check database connection health
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*/
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async checkHealth(): Promise<boolean> {
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try {
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await this.connected;
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if (!this.db) return false;
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await this.db.admin().ping();
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return true;
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} catch (error) {
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return false;
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}
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}
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private async getCollection(objectName: string) {
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await this.connected;
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if (!this.db) throw new Error("Database not initialized");
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return mongoCondition;
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}
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/**
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* Normalizes query format to support both legacy UnifiedQuery and QueryAST formats.
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* This ensures backward compatibility while supporting the new @objectstack/spec interface.
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*
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* QueryAST format uses 'top' for limit, while UnifiedQuery uses 'limit'.
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* QueryAST sort is array of {field, order}, while UnifiedQuery is array of [field, order].
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* QueryAST uses 'aggregations', while legacy uses 'aggregate'.
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*/
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private normalizeQuery(query: any): any {
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if (!query) return {};
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const normalized: any = { ...query };
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// Normalize limit/top
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if (normalized.top !== undefined && normalized.limit === undefined) {
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normalized.limit = normalized.top;
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}
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// Normalize aggregations/aggregate
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if (normalized.aggregations !== undefined && normalized.aggregate === undefined) {
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// Convert QueryAST aggregations format to legacy aggregate format
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normalized.aggregate = normalized.aggregations.map((agg: any) => ({
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func: agg.function,
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field: agg.field,
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alias: agg.alias
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}));
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}
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// Normalize sort format
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if (normalized.sort && Array.isArray(normalized.sort)) {
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// Check if it's already in the array format [field, order]
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const firstSort = normalized.sort[0];
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if (firstSort && typeof firstSort === 'object' && !Array.isArray(firstSort)) {
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// Convert from QueryAST format {field, order} to internal format [field, order]
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normalized.sort = normalized.sort.map((item: any) => [
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item.field,
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item.order || item.direction || item.dir || 'asc'
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]);
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}
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}
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return normalized;
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}
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async find(objectName: string, query: any, options?: any): Promise<any[]> {
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const normalizedQuery = this.normalizeQuery(query);
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const collection = await this.getCollection(objectName);
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const filter = this.mapFilters(query.filters);
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const filter = this.mapFilters(normalizedQuery.filters);
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const findOptions: FindOptions = {};
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if (query.skip) findOptions.skip = query.skip;
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if (query.limit) findOptions.limit = query.limit;
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if (query.sort) {
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if (normalizedQuery.skip) findOptions.skip = normalizedQuery.skip;
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if (normalizedQuery.limit) findOptions.limit = normalizedQuery.limit;
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if (normalizedQuery.sort) {
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// map [['field', 'desc']] to { field: -1 }
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findOptions.sort = {};
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for (const [field, order] of query.sort) {
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for (const [field, order] of normalizedQuery.sort) {
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// Map both 'id' and '_id' to '_id' for backward compatibility
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const dbField = (field === 'id' || field === '_id') ? '_id' : field;
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(findOptions.sort as any)[dbField] = order === 'desc' ? -1 : 1;
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}
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}
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if (query.fields && query.fields.length > 0) {
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if (normalizedQuery.fields && normalizedQuery.fields.length > 0) {
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findOptions.projection = {};
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for (const field of query.fields) {
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for (const field of normalizedQuery.fields) {
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// Map both 'id' and '_id' to '_id' for backward compatibility
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const dbField = (field === 'id' || field === '_id') ? '_id' : field;
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(findOptions.projection as any)[dbField] = 1;

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