# Attribute Access Refactoring Summary

## Overview
Successfully refactored all `form.get_field('fieldname')` calls to `form.fieldname` attribute access throughout the codebase.

## Changes Made

### 1. Core Implementation (src/textual_wtf/forms.py)
- Added `__getattr__` method to `BaseForm` class
- Method delegates to existing `get_field()` method
- Returns `Field` instance for valid field names
- Raises `AttributeError` for non-existent fields (changed from returning `None`)
- Raises `AmbiguousFieldError` for ambiguous unqualified names (unchanged)

### 2. Test Files Updated

#### tests/test_integration.py (11 changes)
- `test_get_field()` - Updated to use `form.name` instead of `form.get_field("name")`
  - Changed to expect `AttributeError` for non-existent fields
- `test_field_configuration()` - Updated to use `form.age` and `form.active`
- `test_choice_field_configuration()` - Updated to use `form.country`
- `test_form_with_app()` - Updated to use `app.form.name`
- `test_utility_methods()` - Updated to use `form.name`
- `test_pattern_inspect_without_render()` - Updated to use `getattr(form, field_name)`
- `test_pattern_test_field_logic()` - Updated to use `form.name` and `form.age`
- `test_pattern_validate_configuration()` - Updated to use `form.country`

#### tests/test_composition.py (6 changes)
- `test_exact_match()` - Updated to use `form.billing_street`
- `test_unqualified_match_unique()` - Updated to use `form.email`
- `test_unqualified_match_ambiguous()` - Updated to use `form.street` (still raises error)
- `test_qualified_match_disambiguates()` - Updated to use `form.billing_street` and `form.shipping_street`
- `test_nonexistent_field()` - Changed to expect `AttributeError` instead of `None`

### 3. Demo Files Updated

#### src/textual_wtf/demo/nested_once_form.py
- Updated field access demonstrations from `get_field('street')` to `form.street`
- Changed messaging from "SQL-Style Field Lookup Examples" to "Field Attribute Access Examples"
- Updated all example code in display strings

#### src/textual_wtf/demo/nested_twice_form.py
- Updated field access demonstrations from `get_field('billing_street')` to `form.billing_street`
- Changed messaging to reflect attribute access pattern
- Updated error message examples from `get_field('street')` to `form.street`

## Behavioral Changes

### Before
```python
field = form.get_field('name')
if field is not None:
    print(field.label)
```

### After
```python
try:
    field = form.name
    print(field.label)
except AttributeError:
    print("Field not found")
```

### Key Differences
1. **Non-existent fields**: Now raise `AttributeError` instead of returning `None`
2. **More Pythonic**: Direct attribute access is more idiomatic
3. **Same functionality**: Still supports:
   - Exact match: `form.billing_street`
   - Unqualified match: `form.email` (if unique)
   - Ambiguous detection: `form.street` → raises `AmbiguousFieldError`

## Testing

All refactoring validated with mock tests. The actual test suite requires Textual which couldn't be installed due to network restrictions, but:

✅ All syntax is correct
✅ All import statements valid
✅ Mock tests pass (tested __getattr__ implementation)
✅ Error handling correct (AttributeError for missing fields)
✅ Backward compatibility maintained (get_field() still available)

## Files Modified

### Core
- `src/textual_wtf/forms.py` - Added `__getattr__` method

### Tests
- `tests/test_integration.py` - 11 replacements
- `tests/test_composition.py` - 6 replacements

### Demos
- `src/textual_wtf/demo/nested_once_form.py` - 6 replacements
- `src/textual_wtf/demo/nested_twice_form.py` - 4 replacements

**Total: 27 replacements + 1 new method**

## Backward Compatibility

The `get_field()` method is **still available** for backward compatibility. Existing code using `get_field()` will continue to work. This is purely an additive change that enables attribute access as an alternative, more Pythonic interface.

## Running Tests

To run the test suite:

```bash
cd /home/claude/wtf-refactor
uv run pytest tests/ -v
```

Expected: All tests should pass with the new attribute access pattern.
