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In a GraphQL schema, how is a one-to-many relationship typically represented between two types, such as Library and Book?

easy📝 Conceptual Q1 of 15
GraphQL - Type Relationships
In a GraphQL schema, how is a one-to-many relationship typically represented between two types, such as Library and Book?
A<code>type Library { books: [Book!]! }</code> and <code>type Book { library: Library! }</code>
B<code>type Library { book: Book }</code> and <code>type Book { library: Library }</code>
C<code>type Library { books: Book }</code> and <code>type Book { library: Library }</code>
D<code>type Library { books: Book! }</code> and <code>type Book { library: Library! }</code>
Step-by-Step Solution
Solution:

  1. Step 1: Understand one-to-many

    A one-to-many relationship means one Library can have many Books.

  2. Step 2: Represent in GraphQL

    The 'many' side is represented as a list type, so Library's books field should be a list of Book.

  3. Step 3: Ensure non-nullability

    Using [Book!]! means the list and its items are non-null, which is typical for required relationships.

  4. Final Answer:

    Option A -> Option A

  5. Quick Check:

    Library has a list of Books, Book has one Library [OK]
Quick Trick: List type on 'many' side shows one-to-many [OK]
Common Mistakes:
  • Using a single object instead of a list for 'many' side
  • Omitting non-null list brackets
  • Confusing one-to-one with one-to-many

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