Hey :wave: I'm using apollo to generate an introspected schema json from an SDL, but when I try to f...

# apollo-kotlin

[Ryan Brink]

Hey 👋 I'm using apollo to generate an introspected schema json from an SDL, but when I try to feed the json into a tool like GraphiQL or GQL voyager, I get an error

buildClientSchema.mjs:193 Uncaught Error: Introspection result missing interfaces: { kind: "OBJECT", name: "issue__c", fields: [[Object], [Object], [Object]] }.

Does anyone know what might be going on here? as far as I can tell, the SDL is valid (can feed sdl into voyager and see visualization). I've attached the introspection blob in case that helps. Appreciate any ideas 🙏

Untitled

[bod]

An introspection schema json is the raw result of an introspection GraphQL query. There are several possible ways to write such a query, which will result in different shapes of the response. It is possible that this json response doesn't correspond to the query made by these tools and so they can't find what they're looking for in it.

[bod]

it looks like the interfaces field is missing

[Ryan Brink]

🤔 is there a way to feed that query into the ._toIntrospectionSchema_() call? otherwise I'm not sure how to generate this

[Ryan Brink]

could it be that the json is treating an empty array as a null value and trimming it? not sure why there would be no interface block, other than that I haven't defined any

[bod]

interfaces is of a nullable type. Yes it may be something like this!

[Ryan Brink]

interesting... I see that under the hood, there is a IntrospectionSchemaBuilder seems like that would be the only way to get in the weeds w/ this schema generator, but it is private

[Ryan Brink]

oh i guess i could just use data class IntrospectionSchema directly

[Ryan Brink]

oh nice you guys use ktx serialization, i could probably just use a custom serializer

[bod]

ah we do use explicitNulls = false , it's probably that?

[bod]

When this flag is disabled properties with null values without default are not encoded;

[bod]

oh nice you guys use ktx serialization, i could probably just use a custom serializer

so yes I think that should work 🙂

[Ryan Brink]

schema = schema.copy(
                    __schema = schema.__schema.copy(
                        types = schema.__schema.types.map {
                            if (it is IntrospectionSchema.Schema.Type.Object) {
                                it.copy(
                                    interfaces = emptyList()
                                )
                            } else {
                                it
                            }
                        }
                    )
                )

kinda gross but this solves it... now I get a new error 😄

[bod]

you may still have other issues however if... ah 😄

[Ryan Brink]

ty for the help! 🙌

[bod]

sure thing!

[Ryan Brink]

think you guys might want to consider adding encodeDefaults = true to the json serializer. Reason being, that if you don't things like Field.args which default to an empty array will not be included in the encoded result

[Ryan Brink]

this now works 🦜 with the schema changes above and adding using the serializer w/ encodeDefaults

[bod]

but args is not nullable

[bod]

oh sorry encodeDefaults

[Ryan Brink]

yes 🙂

[bod]

indeed!

[bod]

would you be interested in opening a PR for that? (no worries at all if not)

[Ryan Brink]

nothing hits like 1 line open source cred 😈

[Ryan Brink]

sure thing

[bod]

it may be a bit more than 1 line because of tests 😛

[Ryan Brink]

haha no worries... will see how many things I break some time today 🙂