# Wheels Debugging

> Troubleshoot common Wheels errors and provide debugging guidance. Use when encountering errors, exceptions, or unexpected behavior. Provides error analysis, common solutions, and debugging strategies for Wheels applications.

- Skill: `majiayu000/wheels-debugging` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add majiayu000/wheels-debugging`
- Raw SKILL.md: https://api.skillmd.com/api/skills/majiayu000/wheels-debugging/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: majiayu000 (https://skillmd.com/u/majiayu000)
- Updated: 2026-09-09
- Page: https://skillmd.com/skills/majiayu000/wheels-debugging

---


# Wheels Debugging

## Common Errors

### "Missing argument name" Error

**Cause:** Mixed positional and named arguments

**Solution:** Use consistent argument style
```cfm
❌ hasMany("comments", dependent="delete")
✅ hasMany(name="comments", dependent="delete")
```

### "Can't cast Object type [Query] to [Array]"

**Cause:** Using Array functions on queries

**Solution:** Use query methods
```cfm
❌ ArrayLen(post.comments())
✅ post.comments().recordCount
```

### "Association not found" Error

**Cause:** Association not properly defined or typo

**Solution:**
1. Check model config() for association definition
2. Verify association name matches
3. Check model name spelling

### "Table not found" Error

**Cause:** Migration not run or table name mismatch

**Solution:**
```bash
wheels dbmigrate latest
```

### "Column not found" Error

**Cause:** Property doesn't exist in database

**Solution:**
1. Add column via migration
2. Check property name spelling
3. Verify case sensitivity

## Debugging Tools

### Enable Debug Output
```cfm
// In config/settings.cfm
set(showDebugInformation=true);
set(showErrorInformation=true);
```

### Inspect Variables
```cfm
<cfdump var="#post#" label="Post Object">
<cfabort>
```

### Check SQL Queries
```cfm
// Wheels logs all SQL to debugging output
// Look for red SQL queries (errors)
```

---

**Generated by:** Wheels Debugging Skill v1.0