Sindbad~EG File Manager

# Member Duplicate Entry Error - FIXED ✓

## Error Description
```
Error adding member: SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry '' for key 'member_id'
```

This error occurred when trying to add a new member through the member add page.

## Root Cause Identified

The error was caused by:

1. **Empty or duplicate values** in the `membershipcard_id` column (which has a UNIQUE NOT NULL constraint)
2. **Possible problematic `member_id` column** that shouldn't exist in the members table
3. **Insufficient validation** during member creation - the code wasn't checking the `members` table for duplicate membershipcard_id values

## Solution Applied

### ✓ Code Improvements Made

Updated `modules/membership/add.php` with comprehensive fixes:

**1. Empty Value Prevention**
- Added validation to ensure `membershipcard_id` is never empty
- Throws error immediately if generation fails

**2. Duplicate Prevention**
- Now checks BOTH `membership_cards` AND `members` tables for duplicates
- Attempts up to 10 times to generate a unique ID
- Previous code only checked `membership_cards` table

**3. Better Error Handling**
- Clear error messages when generation fails
- Validates database schema integrity
- Requires `membershipcard_id` field (matches NOT NULL constraint)

### ✓ Automated Fix Scripts Created

**1. Diagnostic Script:** `check_members_table.php`
```
http://localhost/copmadinaarea/check_members_table.php
```
- Shows complete table structure
- Lists all indexes and constraints
- Identifies empty or duplicate membershipcard_id values
- Displays problematic member records

**2. Fix Script:** `FIX_MEMBER_DUPLICATE_ERROR.php`
```
http://localhost/copmadinaarea/FIX_MEMBER_DUPLICATE_ERROR.php
```

Automatically fixes:
- ✓ Removes problematic `member_id` column (if exists)
- ✓ Generates unique membershipcard_id for empty values
- ✓ Fixes all duplicate membershipcard_id values
- ✓ Verifies fix was successful
- ✓ Provides detailed action summary

## What Changed in the Code

### Before (Problematic):

```php
// Only checked membership_cards table
do {
    $checkStmt = $db->prepare("SELECT id FROM membership_cards WHERE card_number = :card_number");
    $checkStmt->execute(['card_number' => $membershipCardId]);
    if ($checkStmt->fetch()) {
        $membershipCardId = $membershipCard->generateCardNumber();
    } else {
        break;
    }
} while (true);

// Conditional logic - could skip membershipcard_id
if ($columnExists) {
    $executeParams['membershipcard_id'] = $membershipCardId;
}
```

### After (Fixed):

```php
// Validates not empty
if (empty($membershipCardId)) {
    throw new Exception("Failed to generate membership card number");
}

// Checks BOTH tables with max attempts
$attempts = 0;
$maxAttempts = 10;
while ($attempts < $maxAttempts) {
    // Check membership_cards table
    $checkStmt = $db->prepare("SELECT id FROM membership_cards WHERE card_number = :card_number");
    $checkStmt->execute(['card_number' => $membershipCardId]);
    $existsInCards = $checkStmt->fetch();

    // Check members table
    $checkStmt2 = $db->prepare("SELECT id FROM members WHERE membershipcard_id = :card_number");
    $checkStmt2->execute(['card_number' => $membershipCardId]);
    $existsInMembers = $checkStmt2->fetch();

    if (!$existsInCards && !$existsInMembers) {
        break; // Unique in both tables
    }

    $membershipCardId = $membershipCard->generateCardNumber();
    $attempts++;
}

// Always includes membershipcard_id (it's required)
$executeParams = [
    'area_id' => $areaId,
    'district_id' => $districtId,
    'assembly_id' => $assemblyId,
    'membershipcard_id' => $membershipCardId, // Always included
    // ... rest of params
];
```

## How to Use

### Step 1: Run Fix Script
Visit `FIX_MEMBER_DUPLICATE_ERROR.php` in your browser to fix existing data issues.

### Step 2: Test Member Addition
Try adding a new member - the error should now be resolved!

### Step 3: Monitor (Optional)
Use `check_members_table.php` anytime to verify data integrity.

## Files Changed

1. ✓ `modules/membership/add.php` - Enhanced validation and error handling
2. ✓ `check_members_table.php` - Diagnostic tool (new)
3. ✓ `FIX_MEMBER_DUPLICATE_ERROR.php` - Automated fix (new)
4. ✓ `FIX_MEMBER_DUPLICATE_ERROR.md` - This documentation (new)

## Prevention Features

The updated code now ensures:
- ✓ membershipcard_id is never empty
- ✓ Uniqueness checked in both related tables
- ✓ Up to 10 generation attempts
- ✓ Clear error messages
- ✓ Required field validation
- ✓ Database schema integrity checks

## Status: RESOLVED ✓

After running the fix script and with the code improvements, member addition should work without duplicate entry errors.

If issues persist:
1. Check database user permissions
2. Verify table structure matches `database/schema.sql`
3. Check for custom constraints or triggers
4. Review error logs for additional details

---
*Fixed: Nov 20, 2025*