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    CASE statement builder.

    Example CASE statements:

        SELECT foo,
            CASE
                WHEN foo = 1 THEN "one"
                WHEN foo = 2 THEN "two"
                ELSE "?"
            END -- will be in column named "case" in postgres --
        FROM bar;

        -- equivalent to above --
        SELECT foo,
            CASE foo
                WHEN 1 THEN "one"
                WHEN 2 THEN "two"
                ELSE "?"
            END

    Corresponding peewee:

        # No predicate, use expressions.
        Bar.select(Bar.foo, case(None, (
            (Bar.foo == 1, "one"),
            (Bar.foo == 2, "two")), "?"))

        # Predicate, will test for equality.
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    Convert a model instance (and any related objects) to a dictionary.

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    :param exclude: A list (or set) of field instances that should be
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    :param list extra_attrs: Names of model instance attributes or methods
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