如何将字典插入mongodb中的列表？

Question

I need to insert a dictionary to a list in a list in mongodb,

I have this db:

{library_id:1, library_name:rj, library_books:[{book_name:r&d, page_num:312, book_tags:[]}, {book_name:java, page_num:122, book_tags:[]}]}

and I want to insert into book_tags according to fitting book_name

so it will be like this (for book_name r&d)-

{library_id:1, library_name:rj, library_books:[{book_name:r&d, page_num:312, book_tags:[{tag_name:study, tag_description:self learning}]},{book_name:java, page_num:122, book_tags:[]}]}

How can I do this? Thanks!

Answer 1

You should to update the field. This seems like this:

db.mongodb.update_one(
       { 'library_books.book_name': your_book_name },
       { $push: { 'library_books.book_name': your_tags } }
    )

Maybe you need to use $each instead of $push . The difference is describing here .

Read this answer too. I think this is your way.