Laravel - PHP Error SQLSTATE[23000]: Integrity constraint violation: 1452 Cannot add or update a child row: a foreign key constraint fails

user26731667
September 17, 2024
65 views
1 vote
2 Answers

Looking to finish an e-commerce project, when I click on my place order button I get this error, any advice?

SQLSTATE[23000]: Integrity constraint violation: 1452 Cannot add or update a child row: a foreign key constraint fails (ecommerce_project.orders, CONSTRAINT orders_product_id_foreign FOREIGN KEY (product_id) REFERENCES users (id) ON UPDATE CASCADE) (Connection: mysql, SQL: insert into orders (name, rec_address, phone, user_id, product_id, updated_at, created_at) values (user, canada, 1525548, 1, 19, 2024-09-17 08:12:36, 2024-09-17 08:12:36))

Code:

throw new UniqueConstraintViolationException(
$this->getName(), $query, $this->prepareBindings($bindings), $e
);
}

        throw new QueryException(
            $this->getName(), $query, $this->prepareBindings($bindings), $e
        );
    }
}

/**
 * Determine if the given database exception was caused by a unique constraint violation.
 *
 * @param  Exception  $exception
 * @return bool
 */

Tags: laravel php

Answers

- Alessandro
- September 17, 2024 at 10:32 am
- 0 votes
0
Looks like user_id from orders is not present in the users table which is why you can’t insert the new order

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- MuhammadSajidulIslam
- September 17, 2024 at 1:35 pm
- 0 votes
0
The error you are encountering is related to a foreign key constraint. Specifically, it says that the product_id in the orders table is referencing the id column of the users table, which seems like a mismatch, as typically, a product_id should reference the id column of a products table, not users.

Here’s how you can resolve this:
1. Check your migration file: Ensure that the foreign key constraint is correctly set for the product_id. It should reference the id column of the products table, not the users table.
  
  For example, if your current migration looks like this:
```
$table->foreign('product_id')->references('id')->on('users')->onUpdate('cascade');
```
  Update it to:
```
$table->foreign('product_id')->references('id')->on('products')->onUpdate('cascade');
```
2. Check your database schema: Ensure that the product_id column in your orders table is correctly set as a foreign key referencing the products table.
3. Data integrity: Ensure that the product_id being inserted (in this case, 19) exists in the products table. If this product doesn’t exist, it will also cause a foreign key violation.
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