如何在 mongodb 中检查 $addToSet return true 或 false?

How to check $addToSet return true or false in mongodb?

我想检查文档中的字段 (pv_time),如果数据不重复,则在 pv_time 和其他字段中插入数据 also.In 允许其他字段重复。使用 $addToSet 我正在尝试这样做。

这是我的 python 代码:

 for row in results.get('rows'):
    path = row[0]
    feedbackId = row[1]
    pvDate = row[2]+' '+row[3]+':'+row[4]
    city = row[5]
    country = row[6]
    pageviews = int(row[7])
    db.customer_feedback_requests_archive.update({'feedback_request_id':ObjectId(feedbackId)},{'$addToSet':{'pv_time.'+path:pvDate},'$push':{'pv_city.'+path:city,'pv_country.'+path:country},'$inc':{'pv_count.'+path:pageviews}})

如果我 运行 这是第一次给出

{
        "_id" : ObjectId("558d3900996f95a24aa69ef3"),
        "feedback_request_id" : ObjectId("5665015a882a5174379d4dbd"),
        "pv_count" : {
                "main-rating" : 2
        },
        "pv_city" : {
                "main-rating" : [
                        "Bengaluru",
                        "Bengaluru"
                ]
        },
        "pv_country" : {
                "main-rating" : [
                        "India",
                        "India"
                ]
        },
        "pv_time" : {
                "main-rating" : [
                        "20151208 10:00",
                        "20151208 10:01"
                ]
        }
}

但是如果我 运行 这个工作两次然后它给出:

{
        "_id" : ObjectId("558d3900996f95a24aa69ef3"),
        "feedback_request_id" : ObjectId("5665015a882a5174379d4dbd"),
        "pv_count" : {
                "main-rating" : 4
        },
        "pv_city" : {
                "main-rating" : [
                        "Bengaluru",
                        "Bengaluru",
                        "Bengaluru",
                        "Bengaluru"
                ]
        },
        "pv_country" : {
                "main-rating" : [
                        "India",
                        "India",
                        "India",
                        "India"
                ]
        },
        "pv_time" : {
                "main-rating" : [
                        "20151208 10:00",
                        "20151208 10:01"
                ]
        }
}

我想要 pv_citypv_country 中的重复值,仅当 pv_time 不同时,第二次我希望 pv_time 没有更新,那么它应该不更新 pv_citypv_country.

它相当简单,您只需稍微扩展一下查询即可。

db.customer_feedback_requests_archive.update(
  {'feedback_request_id':ObjectId(fee‌​dbackId),'pv_time.'+path:{'$ne':pvDate}},
  {'$addToSet':{'pv_time.'+path:pvDate},'$‌​push':{'pv_city.'+path:city,'pv_country.'+path:country},'$inc':{'pv_count.'+path:‌​pageviews}}
)

额外查询参数的作用是,如果数组中已经有日期,它会搜索。如果它不存在,将启动更新,这将解决您的问题。