GraphQL 8

Question 1

How can you write inline fragment when types in a union implement the same interface?

Answer 1

union SearchResult = Human | Droid | Starship

Since Human and Droid share a common interface (Character), you can query their common fields in one place rather than having to repeat the same fields across multiple types.

Question 2

What is the input type?

Answer 2

More often scalar values, like enums or strings, are passed as arguments into a field.

But you can also easily pass complex objects. This is particularly valuable in the case of mutations, where you might want to pass in a whole object to be created.

In the GraphQL schema language, input types look exactly the same as regular object types, but with the keyword input instead of type.

Question 3

Can you mix regular types and input types?

Answer 3

The fields on an input object type can themselves refer to input object types, but you can’t mix input and output types (just type) in your schema.

Question 4

Can input types have arguments on their fields?

Answer 4

Input object types can’t have arguments on their fields.