我正在将Python的库用于Mongo（pymongo），我的文档如下所示：
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Created by potrace 1.15, written by Peter Selinger 2001-2017
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如果ID为12的文档存在，我想将新的价格对象推送到“ price_history”数组中。如果没有，我将创建一个与粘贴的代码相同的新文档。
这似乎很简单，但是我检查了多个stackoverflow主题和mongodb文档，但无法获取它：/
我想出了代码：
{"vendor_id": 12, "title": "xyz", "price": 1499.0, "price_history": [{"date": "2019-12-01", "price": 1890.0}]}
但是当找不到文档时，它仅插入vendor_id而不是整个文档。
有什么提示吗？ 谢谢您花费时间解决我的问题。
答案 0 :(得分：2)
$setOnInsert进行救援：
db.holidays.update(
{ "vendor_id": t["vendor_id" }, // Query parameter
,{ // Update document
"$push": {"price_history": t["price_history"][0]},
"$setOnInsert": { everything else you want insert besides the push and the vendor_id
}
,{ upsert: true } // Options
)
答案 1 :(得分：1)
将记录提取到字典中，并使用标准python进行操纵。如果您使用find_one()并且没有匹配项，它将返回None
from pymongo import MongoClient
from bson.json_util import dumps
db = MongoClient()["testdatabase"]
# Data setup
db.testcollection.delete_many({})
template = {"vendor_id": 12, "title": "xyz", "price": 1499.0, "price_history": []}
data_setup = {"vendor_id": 12, "title": "xyz", "price": 1499.0,
"price_history": [{"date": "2019-12-01", "price": 1890.0}]}
new_price = {"date": "2019-12-02", "price": 2000.0}
# Comment the next line out to see what happens if the record isn't present
db.testcollection.insert_one(data_setup)
record = db.testcollection.find_one({"vendor_id": 12})
if record is None:
record = template
record['price_history'].append(new_price)
db.testcollection.replace_one({"vendor_id": 12}, record, upsert=True)
# Pretty up the record output
print(dumps(db.testcollection.find_one({}, {'_id': 0}), indent=4))
给予：
{
"vendor_id": 12,
"title": "xyz",
"price": 1499.0,
"price_history": [
{
"date": "2019-12-01",
"price": 1890.0
},
{
"date": "2019-12-02",
"price": 2000.0
}
]
}