Pymongo 是否内置了验证规则? [英] Does Pymongo have validation rules built in?
本文介绍了Pymongo 是否内置了验证规则?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我正在尝试根据架构验证插入的文档,并试图找到一种方法来验证插入的文档.
I am trying to validate an inserted document against a schema, and was trying to find a way to validate the inserted document.
有像 MongoEngine
这样的库说他们可以完成这项工作,但是有没有办法直接通过 pymongo
进行文档验证?
There are libraries like MongoEngine
that say they do the work, but is there a way to do document validation directly via pymongo
?
推荐答案
python 驱动程序文档确实对如何使用 db.command
做了一些说明.这是一个完整的工作示例:
The python driver docs are indeed a little light on how to use the db.command
. Here is a complete working example:
from pymongo import MongoClient
from collections import OrderedDict
import sys
client = MongoClient() # supply connection args as appropriate
db = client.testX
db.myColl.drop()
db.create_collection("myColl") # Force create!
# $jsonSchema expression type is prefered. New since v3.6 (2017):
vexpr = {"$jsonSchema":
{
"bsonType": "object",
"required": [ "name", "year", "major", "gpa" ],
"properties": {
"name": {
"bsonType": "string",
"description": "must be a string and is required"
},
"gender": {
"bsonType": "string",
"description": "must be a string and is not required"
},
"year": {
"bsonType": "int",
"minimum": 2017,
"maximum": 3017,
"exclusiveMaximum": False,
"description": "must be an integer in [ 2017, 3017 ] and is required"
},
"major": {
"enum": [ "Math", "English", "Computer Science", "History", None ],
"description": "can only be one of the enum values and is required"
},
"gpa": {
# In case you might want to allow doubles OR int, then add
# "int" to the bsonType array below:
"bsonType": [ "double" ],
"minimum": 0,
"description": "must be a double and is required"
}
}
}
}
cmd = OrderedDict([('collMod', 'myColl'),
('validator', vexpr),
('validationLevel', 'moderate')])
db.command(cmd)
try:
db.myColl.insert({"x":1})
print "NOT good; the insert above should have failed."
except:
print "OK. Expected exception:", sys.exc_info()
try:
okdoc = {"name":"buzz", "year":2019, "major":"Math", "gpa":3.8}
db.myColl.insert(okdoc)
print "All good."
except:
print "exc:", sys.exc_info()
这篇关于Pymongo 是否内置了验证规则?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
查看全文