Ability to exclude specific columns

[finiteinfinity]

There doesn't seem to be a way of excluding column by name currently. I've come across a few situations where this would be a desired behaviour, e.g. when using generated columns in MySQL. Take the following table defintion:

CREATE TABLE `order_lines` (
    `quantity` INT NOT NULL,
    `price` DOUBLE NOT NULL,
    `total` DOUBLE AS (`price` * `quantity`) STORED
);

currently, the library generates models with the total property and allow it to be overridden. However, mysql actually prevents generated columns from being updated:

If a generated column is updated explicitly, the only permitted value is DEFAULT.

This ends up in an exception being thrown if the property is ever overridden.

My suggestion is to add the excludes key in models.php, which accepts either fully qualified table names or patterns (to match the behaviour of except):

<?php

return [

    '*' => [
        'excludes' => [
            'order_lines.total',
            '*generated'
        ]
    ]

which would exclude the total property in the OrderLine model and all properties in all models ending with generated