How to build multi index relation?

Hello All

I have multi index from different input.

One of MongoDB : One of MySQL ; One of Accesslog.

User information in the MySQL. User Behavior in ther Mongodb. IP in the

User information include "User account", "book name", "book id"
User Behavior include "book id", what is user's device( iPad or iPhone or
Android device .... etc )

I want to Analysis user behavior, then output to report for Other PM.

But I can't change book id to book name.

I have saw has_parent and has_child. I don't know this fuction can do it???

Please give me a suggestion.


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