To create a new column in Laravel based on the values found in an existing column, you can use the Laravel migration feature. Here are the steps to follow:
Run the following command to create a new migration file:
php artisan make:migration add_new_column_to_table --table=your_table_name
Open the newly created migration file in the database/migrations folder and add the following code to the up
function:
Schema::table('your_table_name', function (Blueprint $table) {
$table->string('new_column_name')->nullable()->after('existing_column_name');
foreach (\App\YourModel::all() as $row) {
$row->new_column_name = $row->existing_column_name . '_new';
$row->save();
}
});
This code will add a new nullable string column named new_column_name
to the your_table_name
table, and then iterate through all the rows in the your_table_name
table to update the new_column_name
column with a new value based on the value in the existing_column_name
.
To run the migration, run the following command:
php artisan migrate
This will apply the changes to your database schema.
Now you can retrieve the values from the new column in your model using the new_column_name
attribute as you would with any other column.
Note: If you want to roll back the migration, simply run the following command:
php artisan migrate:rollback
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Asked: 2022-06-12 11:00:00 +0000
Seen: 14 times
Last updated: Jul 07 '22
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