SQL-从三个表中选择数据，其中一个表具有多个到同一个主键的外键

Question

I have the following tables and relations:

When I create a User , that user gets a CurrentWeek row and that current week row in turn gets a CurrentWeekStatus row. The user can add food items to the Food table and then can choose from these food items and select a few to insert in CurrentWeek .

In the client I want to grab CurrentWeek as an object that has a list of Food objects and a list of their corresponding status.

I am struggling as to how to make this happen. I think this can be done by making multiple queries to the database, one to fetch CurrentWeek and then from this extract all the FoodId 's and make separate queries to fetch each Food . But this seems like a very bad solution.

The other solution I can think of is making a view with all the necessary data. But I don't know how to make this view and even if I manage to make the view I don't know how to separate each Food into different objects.

Do anyone know of a good way to accomplish this?

I use NodeJs as a REST API and Android Studio with retrofit to send REST calls.

Answer 1

After consulting StackOverflow and a few colleagues I changed the initial database schema into:

This was a design I initially chose to not go with as I thought adding one row on the CurrentWeek table for each user would be better than to add many rows for each user in the PlannedFood table. I see now however that this design have a few advantages as compared to the other design.

Designing it this way also solves my initial question as I can now grab all the rows in PlannedFood for a specific user, joining on FoodId and then map the Food data into a Food object on client-side.