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How to use _wrap_with_readonly method in autotest

Best Python code snippet using autotest_python

model_logic.py

Source:model_logic.py

...8    """\9    Data validation error in adding or updating an object.  The associated10    value is a dictionary mapping field names to error strings.11    """12def _wrap_with_readonly(method):13        def wrapper_method(*args, **kwargs):14            readonly_connection.connection().set_django_connection()15            try:16                return method(*args, **kwargs)17            finally:18                readonly_connection.connection().unset_django_connection()19        wrapper_method.__name__ = method.__name__20        return wrapper_method21def _wrap_generator_with_readonly(generator):22    """23    We have to wrap generators specially.  Assume it performs24    the query on the first call to next().25    """26    def wrapper_generator(*args, **kwargs):27        generator_obj = generator(*args, **kwargs)28        readonly_connection.connection().set_django_connection()29        try:30            first_value = generator_obj.next()31        finally:32            readonly_connection.connection().unset_django_connection()33        yield first_value34        while True:35            yield generator_obj.next()36    wrapper_generator.__name__ = generator.__name__37    return wrapper_generator38def _make_queryset_readonly(queryset):39    """40    Wrap all methods that do database queries with a readonly connection.41    """42    db_query_methods = ['count', 'get', 'get_or_create', 'latest', 'in_bulk',43                        'delete']44    for method_name in db_query_methods:45        method = getattr(queryset, method_name)46        wrapped_method = _wrap_with_readonly(method)47        setattr(queryset, method_name, wrapped_method)48    queryset.iterator = _wrap_generator_with_readonly(queryset.iterator)49class ReadonlyQuerySet(dbmodels.query.QuerySet):50    """51    QuerySet object that performs all database queries with the read-only52    connection.53    """54    def __init__(self, model=None):55        super(ReadonlyQuerySet, self).__init__(model)56        _make_queryset_readonly(self)57    def values(self, *fields):58        return self._clone(klass=ReadonlyValuesQuerySet, _fields=fields)59class ReadonlyValuesQuerySet(dbmodels.query.ValuesQuerySet):60    def __init__(self, model=None):...

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