CORRECT copying of all fields from one Dexterity content object to another instance of the same type

gistfile1.txt

def clone_plone_metadata(source, target):
    """ Copy all metadata key-value pairs of the 'source'
        Dexterity content-object to 'target'.
    """

    from plone.dexterity.interfaces import IDexterityFTI
    from plone.behavior.interfaces import IBehaviorAssignable

    if not isinstance(source, target.__class__):
        raise TypeError('source and target must be the same class ({} vs {})'.format(source.__class__, target.__class__))

    schema = getUtility(IDexterityFTI, name=source.portal_type).lookupSchema()
    fields = [(schema, schema[name]) for name in schema]

    assignable = IBehaviorAssignable(source)
    for behavior in assignable.enumerateBehaviors():
        behavior_schema = behavior.interface
        for name in behavior_schema:
            fields.append((behavior_schema, behavior_schema[name]))

    for schema_adapter, field in fields:
        source_adapted = schema_adapter(source)
        target_adapted = schema_adapter(target)
        value = getattr(source_adapted, field.getName())
        if isinstance(value, str):
            value = unicode(value, 'utf-8')
        setattr(target_adapted, field.getName(), value)