Add ModelWithFieldAttributes *before* PolyModel, so that everything does not
become a "ModelWithFieldAttributes" in the Datastore.
The way PolyModel works, each Model class hierarchy is stored in the Datastore
as the class that directly inherited from PolyModel. So, we do not want to
insert ModelWithFieldAttributes *after* PolyModel by inheriting *from*
PolyModel, or everything would just be a ModelWithFieldAttributes in the
Datastore, instead of Person, Work, Group, etc.
import re
# Valid query types (a dictionary is used for speedy lookups).
QUERY_TERMS = dict([(x, None) for x in (
'exact', 'iexact', 'contains', 'icontains', 'gt', 'gte', 'lt', 'lte', 'in',
'startswith', 'istartswith', 'endswith', 'iendswith', 'range', 'year',
'month', 'day', 'isnull', 'search', 'regex', 'iregex',
)])
# Size of each "chunk" for get_iterator calls.
# Larger values are slightly faster at the expense of more storage space.
GET_ITERATOR_CHUNK_SIZE = 100
# Separator used to split filter strings apart.
LOOKUP_SEP = '__'
# Constants to make looking up tuple values clearer.
# Join lists
TABLE_NAME = 0
RHS_ALIAS = 1
JOIN_TYPE = 2
LHS_ALIAS = 3
LHS_JOIN_COL = 4
RHS_JOIN_COL = 5
NULLABLE = 6
# How many results to expect from a cursor.execute call
MULTI = 'multi'
SINGLE = 'single'
ORDER_PATTERN = re.compile(r'\?|[-+]?[.\w]+$')
ORDER_DIR = {
'ASC': ('ASC', 'DESC'),
'DESC': ('DESC', 'ASC')}