'MongoDB C# Driver Update with Aggregation Pipeline "$replaceOne"

I'm struggling to convert the code below to MongoDB driver C# to an "UpdateMany" with aggregation, can anyone help me?

db.collection.updateMany(
  { URL: { $regex: /helloWorldt/ } },
  [{
    $set: { URL: {
      $replaceOne: { input: "$URL", find: "helloWorldt", replacement: "helloWorld" }
    }}
  }]
)

Thanks,

c++sharpmongodbasp.net-coremongodb-.net-driverpythonpandascsvfor-loop


Solution 1:[1]

        coll.UpdateMany(
            "{ URL: { $regex: '/helloWorldt/' } }",
            PipelineDefinition<BsonDocument, BsonDocument>.Create(
                BsonDocument.Parse($@"
                {{
                    $set:
                    {{
                        URL:
                            {{
                                $replaceOne: {{ input: ""$URL"", find: ""helloWorldt"", replacement: ""helloWorld"" }}
                            }}
                    }}
                }}")));

Solution 2:[2]

every time you operate on the dataframe it returns a new dataframe leaving the original untouched. at the end when you write df.to_csv(...) it is simply writing the original data back at that location.

try:


for file in all_files:
    file_name = os.path.splitext(os.path.basename(file))[0]
    df = pd.read_csv(file_name)
    df = df.dropna(subset=['oo'])
    df = df.insert(3, "ODSegment", df['entrances'] + ' - ' + df['exits'])
    df['WD21AMoovph'] = df['oo']/100*df['estimatedCarsPerHour']
    df = df.rename(columns={"oo": "WD21AMoo", "estimatedCarsPerHour": "WD21AMvph"})
    df.to_csv(file_name, index=False, header=True)

Sources

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Source: Stack Overflow

Solution Source
Solution 1 dododo
Solution 2 Haleemur Ali

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