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added OrderedDynamicField class to store data in the defined order because of #203

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This commit is contained in:
Hiroyasu OHYAMA 2017-02-27 09:55:50 +00:00
parent 5f43c032f2
commit 6810953014
1 changed files with 13 additions and 2 deletions
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15
mongoengine/fields.py
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@ -5,6 +5,7 @@ import re
import time import time
import uuid import uuid
import warnings import warnings
from collections import OrderedDict
from operator import itemgetter from operator import itemgetter
from bson import Binary, DBRef, ObjectId, SON from bson import Binary, DBRef, ObjectId, SON
@ -49,7 +50,7 @@ __all__ = (
'FileField', 'ImageGridFsProxy', 'ImproperlyConfigured', 'ImageField', 'FileField', 'ImageGridFsProxy', 'ImproperlyConfigured', 'ImageField',
'GeoPointField', 'PointField', 'LineStringField', 'PolygonField', 'GeoPointField', 'PointField', 'LineStringField', 'PolygonField',
'SequenceField', 'UUIDField', 'MultiPointField', 'MultiLineStringField', 'SequenceField', 'UUIDField', 'MultiPointField', 'MultiLineStringField',
'MultiPolygonField', 'GeoJsonBaseField' 'MultiPolygonField', 'GeoJsonBaseField', 'OrderedDynamicField'
) )
RECURSIVE_REFERENCE_CONSTANT = 'self' RECURSIVE_REFERENCE_CONSTANT = 'self'
@ -644,7 +645,7 @@ class DynamicField(BaseField):
is_list = True is_list = True
value = {k: v for k, v in enumerate(value)} value = {k: v for k, v in enumerate(value)}
data = {} data = self._container_type() if hasattr(self, '_container_type') else {}
for k, v in value.iteritems(): for k, v in value.iteritems():
data[k] = self.to_mongo(v, use_db_field, fields) data[k] = self.to_mongo(v, use_db_field, fields)
@ -675,6 +676,16 @@ class DynamicField(BaseField):
value.validate(clean=clean) value.validate(clean=clean)
class OrderedDynamicField(DynamicField):
"""A field that wraps DynamicField. This uses OrderedDict class
to guarantee to store data in the defined order instead of dict.
"""
def __init__(self, *args, **kwargs):
super(OrderedDynamicField, self).__init__(*args, **kwargs)
self._container_type = OrderedDict
class ListField(ComplexBaseField): class ListField(ComplexBaseField):
"""A list field that wraps a standard field, allowing multiple instances """A list field that wraps a standard field, allowing multiple instances
of the field to be used as a list in the database. of the field to be used as a list in the database.