Get selection of non required field on introspection - graphql

Question

I'm using GraphQL with Apollo Server and Client in JS and try to introspect my schema.
Simplified I have a schema like:
input LocationInput {
lat: Float
lon: Float
}
input CreateCityInput {
name: String!
location: LocationInput
}
I query this with an introspection like:
fragment InputTypeRef on __Type {
kind
name
ofType {
kind
name
inputFields {
name
type {
name
kind
ofType {
kind
name
inputFields {
name
type {
name
kind
}
}
}
}
}
}
}
query CreateCityInputFields {
input: __type(name: "CreateCityInput") {
inputFields {
name
description
type {
...InputTypeRef
}
}
}
}
As result I receive:
{
"data": {
"input": {
"inputFields": [
{
"name": "name",
"description": "",
"type": {
"kind": "NON_NULL",
"name": null,
"ofType": {
"kind": "SCALAR",
"name": "String",
"inputFields": null
}
}
},
{
"name": "location",
"description": "",
"type": {
"kind": "INPUT_OBJECT",
"name": "LocationInput",
"ofType": null
}
}
]
}
}
}
As one can see: lat and lon are missing. If I set LocationInput as required (location: LocationInput!) in CreateCityInput I receive the missing lat and lon.
How can I query for lat and lon without haven LocationInput required?

Answer 1

Seems like I had a wrong query for the introspection. Moving the inputField part out of ofType to the upper level fix the issue:
kind
name
inputFields {
name
description
type {
kind
name
ofType {
kind
name
}
}
}
ofType {
kind
name
inputFields {
name
description
type {
kind
name
ofType {
kind
name
}
}
}
}
}
query CreateCityInputFields {
input: __type(name: "CreateCityInput") {
inputFields {
name
description
type {
...InputTypeRef
}
}
}
}
Solved the issue.