interface field as interface inherit to maping not implement error

[stanhangzhou]

Hi, I had a schema.graphql, But i can't map it to juniper rust code correct!

My confused If graphql's interface must map to rust trait? and i finally used box as a field. and @ilslv told me representd interface ImageData map to rust enum? i do not know how to map it. @

my schema.graphql code

scalar BigInt
# Long is a 64 bit unsigned integer.
scalar Long

interface ImageData {
  src: String!
  contentType: String
}

interface CollectionVolume {
  change24h: Int
}

interface UserAvatarOmit {
  id: String!
  tokenId: String!
  image: ImageData!
}

interface CollectionOwner {
  address: String!
  isVerified: Boolean!
  name: String!  
  avatar: UserAvatarOmit
}

interface CollectionBase {
  name: String!
  logo: ImageData
}

"The root query object of the schema"
type QueryRoot {  
  collections() : [Collection]
}

type Collection implements CollectionBase {
  "collectionbase attr"
  name: String!
  logo: ImageData

 "type collection attr"
  owner: CollectionOwner!
}

schema {
  query: QueryRoot
}

[stanhangzhou]

This is @ilslv 's response

@stanhangzhou first of all, you are missing a lot of juniper macros. Every type, that appears in the GraphQL schema, should be marked somehow. Regarding your question, every GraphQL Interface is represented with Rust's enum, containing all the implementors of this Interface. So your trait should look something like:

#[graphql_interface(for = [Collection], context = Database)]
pub trait  UserAvatarOmit {
    fn id(&self) -> Option<&str>;
    fn image(&self) -> ImageDataValue;
    //                 ^^^^^^^^^^^^^^ autogenerated enum
}

If you have further question, please create a separate discussion, so it would be easier for others to discover solution for similar problems.

[stanhangzhou]

@ilslv I now understand i need retyped imageData to rust enum but I still can't compiler correct , pls help when you are free,thanks.
my last code is here.

#![allow(missing_docs)]

use std::collections::HashMap;

use juniper::{graphql_interface, graphql_object,  Context,   GraphQLEnum};

#[derive(Clone, Copy, Debug)]
pub struct Query;

#[graphql_object(context = Database)]
/// The root query object of the schema
impl Query {
    fn collection(
        #[graphql(context)] database: &Database,
        #[graphql(description = "id of the collection")] id: String,
    ) -> Option<&Collection> {
        database.get_collection(&id)
    }
}

#[derive(Clone, Copy, Debug)]
pub struct Subscription;


#[derive(Clone)]
pub struct ImageData {
    src: String,
    contentType: String,
}

impl ImageData {
    pub fn new(src: &str, contentType: &str) -> Self {
        Self {
            src: src.into(),
            contentType: contentType.into(),
        }
    }
}

#[graphql_interface(enum = CollectionBaseValue for = Collection)]
pub trait CollectionBase {
    /// The id of the character
    fn id(&self) -> &str;

    /// The name of the collectionbase
    fn name(&self) -> Option<&str>;

    /// logo
    fn logo(&self) -> ImageData;
}

// #[derive(GraphQLObject)]
#[derive(Clone)]
// #[graphql_object(impl = CollectionBase)]
pub struct Collection {
    /// base
    id: String,
    name: String,
    logo: ImageData,
    // owner method
    // owner: Box<dyn CollectionOwner>,
}

impl Collection {
    pub fn new(
        id: &str,
        name: &str,
        logo: ImageData,
        // owner: Box<dyn CollectionOwner>,
    ) -> Self {
        Self {
            id: id.into(),
            /// base
            name: name.into(),
            // name: name.map(Into::into),
            logo: logo.clone().into(),
            // owner: owner,
        }
    }
}

#[graphql_object(context = Database, impl =  CollectionBaseValue)]
impl  Collection {
    pub fn id(&self) -> &str {
        &self.id
    }
    fn name(&self) -> Option<&str> {
        Some(self.name.as_str())
    }
    fn logo(&self) -> ImageData {
        let logo = ImageData::new("hello", "images");
        logo
    }

    // Collection
    // fn owner(&self) -> Box<dyn CollectionOwner> {
    // self.owner
    // }
}



#[derive(Clone, Default)]
pub struct Database {
    collections: HashMap<String, Collection>,
}

impl Context for Database {}

impl Database {
    pub fn new() -> Database {
        let mut collections = HashMap::new();
        collections.insert(
            "3000".into(),
            Collection::new(
                "3000",
                "monkey",
                ImageData {
                    src: String::from("sdf"),
                    contentType: String::from("image/png"),
                },
            ),
        );

        Database { collections }
    }

    pub fn get_collection(&self, id: &str) -> Option<&Collection> {
        self.collections.get(id)
    }

    pub fn get_collectionBase(&self, id: &str) -> Option<CollectionBaseValue> {
        #[allow(clippy::manual_map)]
        if let Some(h) = self.collections.get(id) {
            Some(h.clone().into())
        } else {
            None
        }
    }
}

fn main() {
    let db = Database::new();
}

[ilslv]

@stanhangzhou as I mentioned before you are missing a lot of juniper macros. Please read the book and look at the examples. If something isn't clear, try to minimise your problem and open a separate discussion/issue.

[stanhangzhou]

[ilslv]

@stanhangzhou Rust representation of schema you've described in original question would look something like:

#[graphql_interface]
trait ImageData {
    fn src(&self) -> String;
    fn content_type(&self) -> Option<String>,
}

#[graphql_interface]
trait CollectionVolume {
    fn change_24h(&self) -> Option<i32>;
}

#[graphql_interface]
trait UserAvatarOmit {
    fn id(&self) -> String;
    fn token_id(&self) -> String;
    fn image(&self) -> ImageDataValue;
}

#[graphql_interface]
trait UserAvatarOmit {
    fn address(&self) -> String;
    fn is_verified(&self) -> bool;
    fn name(&self) -> String;
    fn avatar(&self) -> Option<UserAvatarOmitValue>;
}

#[graphql_interface]
trait CollectionBase {
    fn name(&self) -> String;
    fn logo(&self) -> Option<ImageDataValue>;
}

[stanhangzhou]

@ilslv thank you for your response. You are right! I hav try this again!
But I can compile ok When i use async_graphql now!
thank you so much.