Solution:Step 1: Understand the mutation effectThe mutation updates the post with ID 5, changing only the title to "New Title" while keeping other fields unchanged.Step 2: Predict the returned dataThe response includes the updated title and the unchanged content "Old content" along with the ID.Final

[Solved] Given this mutation:mutation { updatePost(id: "5", input: {title: "New Title"}) { id title content } }What will be the output if the post with ID 5 exists and has content "Old content"? | GraphQL

GraphQL - Mutations

Given this mutation:

mutation { updatePost(id: "5", input: {title: "New Title"}) { id title content } }

What will be the output if the post with ID 5 exists and has content "Old content"?

A{ "data": { "updatePost": null } }

B{ "data": { "updatePost": { "id": "5", "title": "Old Title", "content": "Old content" } } }

C{ "data": { "updatePost": { "id": "5", "title": "New Title", "content": "Old content" } } }

DError: Post with ID 5 not found

Step-by-Step Solution

Solution:

Step 1: Understand the mutation effect
The mutation updates the post with ID 5, changing only the title to "New Title" while keeping other fields unchanged.
Step 2: Predict the returned data
The response includes the updated title and the unchanged content "Old content" along with the ID.
Final Answer:
{ "data": { "updatePost": { "id": "5", "title": "New Title", "content": "Old content" } } } -> Option C
Quick Check:
Update mutation returns updated fields plus unchanged fields [OK]

Quick Trick: Update changes specified fields, others remain same [OK]

Common Mistakes:

Assuming all fields reset or become null
Expecting error when post exists
Ignoring unchanged fields in output

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Given this mutation:

Step 1: Understand the mutation effect

Step 2: Predict the returned data

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