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In GraphQL, how is a one-to-one relationship between two types best described?

easy📝 Conceptual Q1 of 15
GraphQL - Type Relationships
In GraphQL, how is a one-to-one relationship between two types best described?
AThe two types share the same fields and data
BEach instance of one type can be linked to multiple instances of the other type
COne type contains a list of the other type's instances
DEach instance of one type is linked to exactly one instance of the other type
Step-by-Step Solution
Solution:

  1. Step 1: Understand relationship types

    One-to-one means a single instance of one type corresponds to a single instance of another.

  2. Step 2: Analyze options

    Each instance of one type is linked to exactly one instance of the other type correctly states this unique pairing. Options B and C describe one-to-many or many-to-many. The two types share the same fields and data is incorrect as types do not share fields.

  3. Final Answer:

    Each instance of one type is linked to exactly one instance of the other type -> Option D

  4. Quick Check:

    One-to-one means unique pairing [OK]
Quick Trick: One-to-one means single unique link per instance [OK]
Common Mistakes:
  • Confusing one-to-one with one-to-many relationships
  • Assuming shared fields imply one-to-one
  • Thinking one-to-one allows multiple links

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