pymongo聚合不允许解释选项 [英] pymongo aggregate don't allow explain option

问题描述

我成功运行:

result = my_col.aggregate(my_pipeline, allowDiskUse=True)

现在，当我尝试:

result = my_col.aggregate(my_pipeline, allowDiskUse=True, explain=True)

它没有说:

pymongo.errors.ConfigurationError: The explain option is not supported. Use Database.command instead.

因此，我尝试添加所需的选项:

Thus I try so as to add the needed option:

result = mydb.command('aggregate', 'mycol', my_pipeline, {'explain':True})

但没有说:

pymongo.errors.OperationFailure: 'pipeline' option must be specified as an array

怎么了?

谢谢您的建议.

基督徒

推荐答案

使用"pipeline"关键字参数将管道传递给"command":

Pass your pipeline using the "pipeline" keyword argument to "command":

db.command('aggregate', 'mycol', pipeline=my_pipeline, explain=True)

例如:

db.command('aggregate', 'mycol', pipeline=[{'$project': {'name': '$field'}}], explain=True)

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