Pluralsight: Building a GraphQL API with Apollo Server 2020

Question 1

03 Resolving Queries / 04 Field Level Directives

3 Field Level Directives

Answer 1

1. @include
2. @skip
3. @deprecated

Question 2

05 Mutating Data / 02 Modifying Data

Can query and mutations go in one request togehter?

Answer 2

No, they need to go separately.

Graphiql or Apollo playground doesn’t support it, but official documentation say that it could be possible in multi-operation documents.

Question 3

05 Mutating Data / 03 Input Types

Is this correct

addNewSession(session: Session): Session

Answer 3

No, param session must be Input rather than Type

Question 4

05 Mutating Data / 04 Enums

How to create mapping between Enum and internal model?

Answer 4

Just create resolver for GraphQL enum.

In object {ENUM: ‘mappedValue’} key is GraphQL enum wheras ‘mappedValue’ is a value from internal model.

Question 5

06 Error Handling and Validation / 02 Built-in Error Handling

Assuming that Session contains Speakers who are taken via REST endpoint that doesn’t work. What will be returned for:

query {
sessions {
title
id
speakers {
name
}
}
}

Answer 5

1. n errors for every session (errors section)
2. n sessions with speakers = null (data section)

Question 6

06 Error Handling and Validation / 05 Union

What is a Union?

Answer 6

It is a construction allowing to return two (or more) different types. Can be used to discard error section and return error or data in data section of the response.

Question 7

07 Working with Apollo Studio / 01 Introduction

What is able to do with Apollo Studio?

Answer 7

Register schemas and monitor usage.