mongoengine | 易学教程

Removing a column from a DictField in MongoDB [Flask + MongoEngine]

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问题 I need to remove a particular column (in this case "Paper ID") from a DictField (in this case "content") in all documents. The corresponding mongo-shell script for the same is db.list_input_file.update({},{$unset:{"content.Paper ID":1}}, false, true); How do I write the same thing using MongoEngine assuming that my model class is named JListInputFile. The documentation for the same isn't very helpful. 回答1: I think the issue you are having is a space in the field name meaning you can't pass it

AttributeError: 'tuple' object has no attribute 'insert'

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问题 I have installed the following, from http://www.django-mongodb.org/topics/setup.html django-nonrel djangotoolbox mongodb-engine after installing i tried to run my program using python manage.py runserver it showing an error like the following, Validating models... Unhandled exception in thread started by <bound method Command.inner_run of <django.contrib.staticfiles.management.commands.runserver.Command object at 0x1655450>> Traceback (most recent call last): File "/home/sakeer/workspace

AttributeError: 'tuple' object has no attribute 'insert'

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I have installed the following, from http://www.django-mongodb.org/topics/setup.html django-nonrel djangotoolbox mongodb-engine after installing i tried to run my program using python manage.py runserver it showing an error like the following, Validating models... Unhandled exception in thread started by <bound method Command.inner_run of <django.contrib.staticfiles.management.commands.runserver.Command object at 0x1655450>> Traceback (most recent call last): File "/home/sakeer/workspace/entevirtual/lib/python2.7/site-packages/django/core/management/commands/runserver.py", line 92, in inner

MongoEngine slicing queryset (mongodb with django)

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问题 I have a queryset like this in python. notes = Note.objects[:10] if i do len(notes) it gives me 10 which is correct. But when i pass "notes" object to template and try {{notes|length}} then i get 16 (which is total count of note data). Even if i do Note.objects.limit(5) it's the same. Is this a bug in MongoEngine? or am i doing something wrong? 回答1: This was a bug in MongoEngine. Issue about this can be found on; https://github.com/hmarr/mongoengine/issues/166 来源： https://stackoverflow.com

How to format data for MongoEngine PointField

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问题 So I wanted to do some experiments with location data in mongodb, so I wrote some python code to generate some testing data. Unfortunately the documentation at http://docs.mongoengine.org/apireference.html#mongoengine.fields.PointField isn't explicit about how to format the input. class Location(db.Document): coord = db.PointField(required=True) # GeoJSON Trying to store a list containing the lng/lat fails: >>> a = Location(coord=[1,2]) >>> a.save() mongoengine.errors.OperationError: Could

MongoEngine: Replacing get_or_create with upsert/update_one

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问题 I understand that get_or_create is now deprecated in favour of using upsert , but how do I make update_one to return the object rather the number of objects modified, and can I just retrieve an object if I don't want to update anything? e.g. Model.objects.get_or_create(first_name='John', last_name='Potter', age=40) # assuming that first_name + last_name + age are enough to uniquiely indentify a person returns a Model object (a new object if it didn't exist, and existing object if it does).

pymongo和mongoengine安装和使用教程包含常用命令行和代码示例

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本文首发于个人博客 https://kezunlin.me/post/e88f04e5/ ，欢迎阅读最新内容！ pymongo and mongoengine tutorial on ubuntu 16.04 Guide version mongo 2.6.10 mongo gui: robo3t-1.3.1 pymongo 3.9.0 MongoEngine 0.18.2 install mongodb sudo apt-get install -y mongodb mongo shell mongo --host mongodb0.example.com --port 27017 mongo --version MongoDB shell version: 2.6.10 see mongo shell > mongo # show all dbs > show dbs # display current db >db test (default database) # switch or create db > use mydb > db.help() > show collections posts system.indexes > db.posts.help() > db.posts.find() help on db and collections >db

pymongo和mongoengine安装和使用教程包含常用命令行和代码示例

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can't query over ListField(EmbeddedDocumentField)

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问题 I have the following model class Skill(EmbeddedDocument): name = StringField(required = True) level = IntField(required = True) class Agent(Document): name = StringField(required = True) email = EmailField(required = True, unique = True) skills = ListField(EmbeddedDocumentField(Skill)) I want to search for the Agents that have skills with (name = "computer skills and level >5) I have wrote the following query: Agent.objects.filter(name='ashraf', skills__level__gt=5,skills__name="Computer

pymongo和mongoengine安装和使用教程包含常用命令行和代码示例

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