Question

I have four classes

1. User
2. profiles
3. Activity
4. Workbook

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1. user can have many profiles based on per year. Every year diff profile
2. User profile will have many to many with Activities

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so there will be profile_activities table with profile_id and activity_id

Now User will do 1 workbook per activity per profile

so i am confused how to map in database

Answer 1

I’ve revised my suggestion in light of your comment.

Perhaps could have an UserActivity class which has an Activity property and a Workbook property.

Then you can have a User class with a property that is a list of Profile classes, and the Profile class will have a property that is a list of UserActivity classes.

This satisfies your object model.

So the UserActivity table will have a foreign key to a row in the Profile table (which will be its parent ID), and foreign keys to the Activity and Workbook tables.

Your Profile table has a foreign key to a row in the User table which is its parentID.