[Dbix-class] Proposed readonly patch for DBIx::Class

[Ben Tilly]

Often database schemas have tables that should not be changed at
runtime in the application.  It would be convenient to be able to mark
this fact in the class.  However to avoid accidents you wind up having
to override methods in both the Row class and the ResultSet class.
Having to synchronize changes to 2 classes is kind of messy.

The attached patch makes this look much nicer in the client code.
With this in the Result class you just say:

  __PACKAGE__->readonly(1);

and now you won't accidentally update that table from in Perl.  It can
be unset at any time and so doesn't provide any actual security, but
it is a useful hint.

Is there any possibility that this could be considered for inclusion
in DBIx::Class?
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