How to Fix Laravel Eloquent\'s \'Expression #1 of SELECT List Not in GROUP BY\' MySQL Error?

Resolving MySQL's "Expression #1 of SELECT List Not in GROUP BY" Error in Laravel Eloquent

In Laravel Eloquent, a common error encountered is the "Expression #1 of SELECT List is not in GROUP BY clause" error when using the groupBy() method. This typically occurs when non-aggregated columns are included in the SELECT list while the aggregation is being performed on other columns.

Consider the following Laravel Eloquent query:

$products = Product::where('status', 1)
            ->where('stock', '>', 0)
            ->where('category_id', '=', $category_id)
            ->groupBy('store_id')
            ->orderBy('updated_at', 'desc')
            ->take(4)
            ->get();

Executing this query may result in the following error:

SQLSTATE[42000]: Syntax error or access violation: 1055 Expression #1
of SELECT list is not in GROUP BY clause and contains nonaggregated
column 'myshop.products.id' which is not functionally dependent on
columns in GROUP BY clause; this is incompatible with
sql_mode=only_full_group_by (SQL: select * from products where
status = 1 and stock > 0 and category_id = 5 group by store_id
order by updated_at desc limit 4)

To resolve this issue, disable MySQL's strict mode in the database connection settings. This mode enforces stricter SQL syntax and column groupings, which can conflict with the query being executed.

Modify the database configuration in the config/database.php file:

'connections' => [
    'mysql' => [
        // Behave like MySQL 5.6
        'strict' => false,

        // Behave like MySQL 5.7
        'strict' => true,
    ]
]

Set the strict option to false to disable strict mode in the MySQL connection. This should resolve the "Expression #1 of SELECT List Not in GROUP BY" error.

For more advanced configuration settings, refer to the blog post by Matt Stauffer.

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