You want to model a blog where each Author can write many Posts, and each Post can have many Tags. Which combination of relations correctly models this in NestJS TypeORM?
hard📝 Application Q8 of 15
NestJS - Database with TypeORM
You want to model a blog where each Author can write many Posts, and each Post can have many Tags. Which combination of relations correctly models this in NestJS TypeORM?
AAuthor has @ManyToMany Posts; Post has @ManyToMany Author; Post has @OneToOne Tags; Tag has @OneToOne Posts
BAuthor has @ManyToOne Posts; Post has @OneToMany Author; Post has @OneToMany Tags; Tag has @ManyToOne Posts
CAuthor has @OneToMany Posts; Post has @ManyToOne Author; Post has @ManyToMany Tags; Tag has @ManyToMany Posts
DAuthor has @OneToOne Posts; Post has @OneToOne Author; Post has @ManyToOne Tags; Tag has @OneToMany Posts
Step-by-Step Solution
Solution:
Step 1: Model Author to Posts relation
Each Author writes many Posts, so Author uses @OneToMany and Post uses @ManyToOne.
Step 2: Model Post to Tags relation
Posts can have many Tags and Tags can belong to many Posts, so both use @ManyToMany.
Final Answer:
Author has @OneToMany Posts; Post has @ManyToOne Author; Post has @ManyToMany Tags; Tag has @ManyToMany Posts -> Option C
Quick Check:
OneToMany + ManyToOne and ManyToMany pairs [OK]
Quick Trick:OneToMany pairs with ManyToOne; ManyToMany pairs with ManyToMany [OK]
Common Mistakes:
Mixing OneToMany with ManyToMany incorrectly
Using OneToOne where many relations exist
Confusing owning and inverse sides
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