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Given this GraphQL schema:

medium📝 query result Q5 of 15
GraphQL - Type Relationships
Given this GraphQL schema:
type Employee { id: ID! projects: [Project!]! } type Project { id: ID! team: [Employee!]! }

What will happen if you query an Employee's projects and for each project, list all team members?
AThe query will return projects without any team members due to missing resolvers.
BThe query will fail because GraphQL does not support lists within lists.
CThe query will return only the first project for each employee due to list limitations.
DThe query will return nested lists showing each employee's projects and all employees on those projects, potentially causing circular references.
Step-by-Step Solution
Solution:
  1. Step 1: Analyze the schema

    Employee has a list of Projects, and each Project has a list of Employees (team).
  2. Step 2: Understand the query

    Querying an Employee's projects and then each project's team will produce nested lists with potential circular references.
  3. Final Answer:

    The query will return nested lists showing each employee's projects and all employees on those projects, potentially causing circular references. -> Option D
  4. Quick Check:

    Lists within lists are valid in GraphQL and circular references are possible [OK]
Quick Trick: Nested lists can cause circular data but are valid in GraphQL [OK]
Common Mistakes:
  • Assuming GraphQL cannot handle nested lists
  • Believing the query will fail due to circular references
  • Thinking only one project or team member will be returned

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