[5.4] Add setKeyType() method to Eloquent abstract Model

[tdondich]

The Eloquent Model class has various public methods to set the protected properties used to match characteristics of the underlying table, such as table name, primary key and primary key type. Eloquent documentation states to overwrite these protected properties in classes that extends Model. However, there are public methods provided to overwrite these values during runtime which are extremely useful if you have Eloquent Models that need to operate on multiple tables. There is setTable and setKeyName and setIncrementing, however, there is no setKeyType method to change the primary key type.

[taylorotwell]

Why are you changing the key type at run time?

[tdondich]

@taylorotwell For dynamic purposes. I may have a table that uses a guid for primary key, or a unique char string, etc. We use the dynamic setTable and setIncrementing, etc for this purpose as well. More detailed info is in ticket #18353.