Wheels Debugging

Common Errors

"Missing argument name" Error

Cause: Mixed positional and named arguments

Solution: Use consistent argument style

❌ 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

❌ 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:

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

// In config/settings.cfm
set(showDebugInformation=true);
set(showErrorInformation=true);

Inspect Variables

<cfdump var="#post#" label="Post Object">
<cfabort>

Check SQL Queries

// Wheels logs all SQL to debugging output
// Look for red SQL queries (errors)

Generated by: Wheels Debugging Skill v1.0