NagisaVon opened a new pull request, #22400:
URL: https://github.com/apache/beam/pull/22400
Added a optional argument to __init__ for the class WriteToMongoDB,
user could write a custom function to modify the behavior of WriteToMongoDB,
such as using UpdateOne instead of ReplaceOne, a default function is provided
so that the WriteToMongoDB class works exactly the same as before when the
optional function is not provided.
# here's the type signature for the custom writeFn
writeFn(optional_func): writeFn(client:MongoClient obj, db:str, coll:str,
documents:[dict], logger:logging.Logger obj)
A custom function that user could implement to
gain more control over the write process. For example,
using UpdateOne or InsertOne instead of ReplaceOne bulk_write
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