私は次の機能を持っています:
_# this is in a module called 'dbw_lib'
def dateTimeOuput(start_days_back, end_days_back):
start_delta = datetime.timedelta(days=start_days_back)
end_delta = datetime.timedelta(days=end_days_back)
start_date = datetime.date.today() - start_delta
end_date = datetime.date.today() - end_delta
return start_date, end_date
def dictByDate(start_days, end_days):
start_date, end_date = dbw_lib.dateTimeOuput(start_days, end_days)
date_string = { "created_at": {"$gte" : start_date, "$lt": end_date } }
user_id_email_dict = dbw_lib.dbwIdToEmailD(user_coll_obj, date_query = date_string) # dict of all user ids and emails
print user_id_email_dict
quit()
_
key_dicts = dictByDate(90, 60)
を実行すると、次のトレースバックが発生します。
_Traceback (most recent call last):
File "main.py", line 212, in <module>
program.runProgram()
File "main.py", line 61, in runProgram
report.RcreateReport()
File "filepath/report.py", line 86, in RcreateReport
key_dicts = dictByDate(90, 60)
File "filepath/report.py", line 65, in dictByDate
user_id_email_dict = dbw_lib.dbwIdToEmailD(user_coll_obj, date_query = date_string) # dict of all user ids and emails
File "filepath/dbw_lib.py", line 50, in dbwIdToEmailD
for pair in id_email_cursor:
File "/Library/Python/2.7/site-packages/pymongo-3.0-py2.7-macosx-10.9-intel.Egg/pymongo/cursor.py", line 968, in __next__
File "/Library/Python/2.7/site-packages/pymongo-3.0-py2.7-macosx-10.9-intel.Egg/pymongo/cursor.py", line 905, in _refresh
File "/Library/Python/2.7/site-packages/pymongo-3.0-py2.7-macosx-10.9-intel.Egg/pymongo/cursor.py", line 812, in __send_message
File "/Library/Python/2.7/site-packages/pymongo-3.0-py2.7-macosx-10.9-intel.Egg/pymongo/mongo_client.py", line 732, in _send_message_with_response
File "/Library/Python/2.7/site-packages/pymongo-3.0-py2.7-macosx-10.9-intel.Egg/pymongo/mongo_client.py", line 743, in _reset_on_error
File "/Library/Python/2.7/site-packages/pymongo-3.0-py2.7-macosx-10.9-intel.Egg/pymongo/server.py", line 85, in send_message_with_response
File "/Library/Python/2.7/site-packages/pymongo-3.0-py2.7-macosx-10.9-intel.Egg/pymongo/message.py", line 107, in get_message
bson.errors.InvalidDocument: Cannot encode object: datetime.date(2015, 3, 1)
_
交換するだけ
datetime.date.today()
と
datetime.datetime.today()
datetime.date
はbsonエンコーダーの一部ではありません。 (たぶん、そのように日付に時間情報を追加するのが曖昧なので、作者はそれを忘れたか、意図的に省略しました。)
ただし、JSONEncoder
でjson
を拡張するのと同じように、pymongoでカスタム型を拡張する関数を作成できます。 SONManipulator
を使用して、pymongoで同様のことを行うことができます。
import datetime
import pymongo
class MigrationTransformer(pymongo.son_manipulator.SONManipulator):
def _encode_date(self, value):
return datetime.datetime.combine(
value,
datetime.datetime.min.time())
def transform_incoming(self, son, collection):
for (key, value) in son.items():
# datetime.datetime is instance of datetime.date
# compare type explicitly only
if type(value) == datetime.date:
son[key] = self._encode_date(value)
Elif isinstance(value, dict): # recurse into sub-docs
son[key] = self.transform_incoming(value, collection)
return son
次に、それをDBインスタンスに追加します。
db.add_son_manipulator(MigrationTransformer())
(質問に関係がないため、transform_outgoing
メソッドを指定していませんが、ここで見つけることができます: http://api.mongodb.org/python/current/examples/custom_type。 html )
編集:dictのキーの値がリスト型の場合は問題があります。何らかの理由で、pymongoはそれをSONManipulator
に渡しません。したがって、リストは変換されません。
これも処理するようにクラスを更新しました(ただし、sets
とtuples
では更新しませんでした)。
class MigrationTransformer(SONManipulator):
def _encode_date(self, value):
return datetime.datetime.combine(
value,
datetime.datetime.min.time())
def _handle_list(self, value):
for index, item in enumerate(value):
if isinstance(item, dict):
value[index] = self._handle_dict(item)
Elif isinstance(item, list):
value[index] = self._handle_list(item)
Elif isinstance(item, datetime.date):
value[index] = self._encode_date(item)
return value
def _handle_dict(self, item):
for (key, value) in item.items():
if type(value) == datetime.date:
item[key] = self._encode_date(value)
Elif isinstance(value, dict): # recurse into sub-docs
item[key] = self._handle_dict(value)
Elif isinstance(value, list): # recurse into sub-docs
item[key] = self._handle_list(value)
return item
def transform_incoming(self, son, collection):
for (key, value) in son.items():
# datetime.datetime is instance of datetime.date
# compare type explicitly only
if type(value) == datetime.date:
son[key] = self._encode_date(value)
Elif isinstance(value, dict): # recurse into sub-docs
son[key] = self.transform_incoming(value, collection)
Elif isinstance(value, list): # recurse into sub-docs
son[key] = self._handle_list(value)
return son