Add withKey method

[buzkall]

In order to specify a different key than the model's one to be the parent key, you can use the ->withKey('name') method.

For example: you have id, code and parent_code in your model.
Your model uses id as key, but the parent-child relation is established between code and parent_code
In order to make SelectTree work with this model, you need to call the function ->withKey('code')

[CodeWithDennis]

I think replacing the $result->getKey() with a custom key is not a great move, since it could be different for everyone. The default should always be $result->getKey() unless it's overwritten.

[buzkall]

You're right, I've changed it to call the model's getKey() function if no custom key is set

[CodeWithDennis]

Reverted