I am using a training grades database from MongoDB. It is structured as follows. "_id": { "$oid": "56d5f7eb604eb380b0d8d8fa" }, "class_id": { "$numberDouble": "173" }, "scores": [ { "score": { ...

I am working on a simple search engine and right now I have a class Directory which contains an ArrayList<Person> that contains objects from the Person class. The Person class has a name, surname and email. The Directory class has a searchPerson(String sea...

我正在尝试在聚合管道中将这行JavaScript代码转换为Python “ codeRun”：{“ $ cond”：{如果：{“ $ isArray”：“ $ QA.answers”}，然后：{“ $ size”：“ $ QA.answers”}，否则：“ NA”}} 我无法构造“然后”部分，它给出了语法错误。 任何帮助将不胜感激！