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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 uuid
import warnings
from collections import OrderedDict
from operator import itemgetter
from bson import Binary, DBRef, ObjectId, SON
@ -49,7 +50,7 @@ __all__ = (
'FileField', 'ImageGridFsProxy', 'ImproperlyConfigured', 'ImageField',
'GeoPointField', 'PointField', 'LineStringField', 'PolygonField',
'SequenceField', 'UUIDField', 'MultiPointField', 'MultiLineStringField',
'MultiPolygonField', 'GeoJsonBaseField'
'MultiPolygonField', 'GeoJsonBaseField', 'OrderedDynamicField'
)
RECURSIVE_REFERENCE_CONSTANT = 'self'
@ -644,7 +645,7 @@ class DynamicField(BaseField):
is_list = True
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():
data[k] = self.to_mongo(v, use_db_field, fields)
@ -675,6 +676,16 @@ class DynamicField(BaseField):
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):
"""A list field that wraps a standard field, allowing multiple instances
of the field to be used as a list in the database.