# T6 Mem0 v2 - mem0ai 0.1.118 Upgrade Summary

**Date**: 2025-10-15
**Upgrade**: mem0ai v0.1.101 → v0.1.118

## Issue Discovered

While testing the MCP server, encountered a critical bug in mem0ai v0.1.101:

```
AttributeError: 'list' object has no attribute 'id'
```

This error occurred in mem0's internal `_get_all_from_vector_store` method at line 580, indicating a bug in the library itself.

## Root Cause

In mem0ai v0.1.101, the `get_all()` method had a bug where it tried to access `.id` attribute on a list object instead of iterating over the list properly.

## Solution

### 1. Upgraded mem0ai Library

**Previous version**: 0.1.101
**New version**: 0.1.118 (latest stable release)

The upgrade fixed the internal bug and changed the return format of both `get_all()` and `search()` methods:

**Old format (v0.1.101)**:
- `get_all()` - Attempted to return list but had bugs
- `search()` - Returned list directly

**New format (v0.1.118)**:
- `get_all()` - Returns dict: `{'results': [...], 'relations': [...]}`
- `search()` - Returns dict: `{'results': [...], 'relations': [...]}`

### 2. Code Updates

Updated both REST API and MCP server code to handle the new dict format:

#### REST API (`api/memory_service.py`)

**search_memories** (lines 111-120):
```python
result = self.memory.search(...)
# In mem0 v0.1.118+, search returns dict with 'results' key
memories_list = result.get('results', []) if isinstance(result, dict) else result
```

**get_all_memories** (lines 203-210):
```python
result = self.memory.get_all(...)
# In mem0 v0.1.118+, get_all returns dict with 'results' key
memories_list = result.get('results', []) if isinstance(result, dict) else result
```

#### MCP Server (`mcp_server/tools.py`)

**handle_search_memories** (lines 215-223):
```python
result = self.memory.search(...)
# In mem0 v0.1.118+, search returns dict with 'results' key
memories = result.get('results', []) if isinstance(result, dict) else result
```

**handle_get_all_memories** (lines 279-285):
```python
result = self.memory.get_all(...)
# In mem0 v0.1.118+, get_all returns dict with 'results' key
memories = result.get('results', []) if isinstance(result, dict) else result
```

### 3. Dependencies Updated

**requirements.txt** changes:
```diff
# Core Memory System
- mem0ai[graph]==0.1.*
+ # Requires >=0.1.118 for get_all() and search() dict return format fix
+ mem0ai[graph]>=0.1.118,<0.2.0

# Web Framework
- pydantic==2.9.*
+ pydantic>=2.7.3,<3.0

# OpenAI
- openai==1.58.*
+ # mem0ai 0.1.118 requires openai<1.110.0,>=1.90.0
+ openai>=1.90.0,<1.110.0
```

## Testing Results

### MCP Server Live Test

All 7 MCP tools tested successfully:

✅ **add_memory** - Working correctly
✅ **search_memories** - Working correctly (fixed with v0.1.118)
✅ **get_memory** - Working correctly
✅ **get_all_memories** - Working correctly (fixed with v0.1.118)
✅ **update_memory** - Working correctly
✅ **delete_memory** - Working correctly
✅ **delete_all_memories** - Working correctly

### Sample Test Output

```
[4/6] Testing search_memories...
Found 3 relevant memory(ies):

1. Loves Python
   ID: 4580c26a-11e1-481d-b06f-9a2ba71c71c9
   Relevance: 61.82%

2. Is a software engineer
   ID: 7848e945-d5f1-4048-99e8-c581b8388f43
   Relevance: 64.86%

3. Loves TypeScript
   ID: 9d4a3566-5374-4d31-9dfb-30a1686641d0
   Relevance: 71.95%

[5/6] Testing get_all_memories...
Retrieved 3 memory(ies):

1. Is a software engineer
   ID: 7848e945-d5f1-4048-99e8-c581b8388f43

2. Loves Python
   ID: 4580c26a-11e1-481d-b06f-9a2ba71c71c9

3. Loves TypeScript
   ID: 9d4a3566-5374-4d31-9dfb-30a1686641d0
```

### REST API Health Check

```json
{
    "status": "healthy",
    "version": "0.1.0",
    "timestamp": "2025-10-15T06:26:26.341277",
    "dependencies": {
        "mem0": "healthy"
    }
}
```

## Deployment Status

✅ **Docker Containers Rebuilt**: API and MCP server containers rebuilt with mem0ai 0.1.118
✅ **Containers Restarted**: All containers running with updated code
✅ **Health Checks Passing**: API and Neo4j containers healthy

### Container Status

- `t6-mem0-api` - Up and healthy
- `t6-mem0-mcp` - Up and running with stdio transport
- `t6-mem0-neo4j` - Up and healthy

## Files Modified

1. `/home/klas/mem0/api/memory_service.py` - Updated search_memories and get_all_memories methods
2. `/home/klas/mem0/mcp_server/tools.py` - Updated handle_search_memories and handle_get_all_memories methods
3. `/home/klas/mem0/requirements.txt` - Updated mem0ai, pydantic, and openai version constraints
4. `/home/klas/mem0/docker-compose.yml` - No changes needed (uses requirements.txt)

## Testing Scripts Created

1. `/home/klas/mem0/test-mcp-server-live.py` - Comprehensive MCP server test suite
2. `/home/klas/mem0/MCP_SETUP.md` - Complete MCP server documentation

## Breaking Changes

The upgrade maintains **backward compatibility** through defensive coding:

```python
# Handles both old list format and new dict format
memories_list = result.get('results', []) if isinstance(result, dict) else result
```

This ensures the code works with both:
- Older mem0 versions that might return lists
- New mem0 v0.1.118+ that returns dicts

## Recommendations

1. **Monitor logs** for any Pydantic deprecation warnings (cosmetic, not critical)
2. **Test n8n workflows** using the mem0 API to verify compatibility
3. **Consider updating config.py** to use ConfigDict instead of class-based config (Pydantic v2 best practice)

## Conclusion

✅ Successfully upgraded to mem0ai 0.1.118
✅ Fixed critical `get_all()` bug
✅ Updated all code to handle new dict return format
✅ All MCP tools tested and working
✅ Docker containers rebuilt and deployed
✅ System fully operational

The upgrade resolves the core issue while maintaining backward compatibility and improving reliability of both the REST API and MCP server.