112 lines
3.0 KiB
Rust
112 lines
3.0 KiB
Rust
use std::borrow::Cow;
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use indexmap::IndexMap;
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use crate::parser::types::Field;
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use crate::registry::{MetaType, Registry};
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use crate::resolver_utils::resolve_container;
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use crate::{
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CacheControl, ContainerType, Context, ContextSelectionSet, ObjectType, OutputType, Positioned,
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ServerResult, SimpleObject, Type, Value,
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};
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use async_graphql_value::ConstValue;
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#[doc(hidden)]
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pub struct MergedObject<A, B>(pub A, pub B);
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impl<A: Type, B: Type> Type for MergedObject<A, B> {
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fn type_name() -> Cow<'static, str> {
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Cow::Owned(format!("{}_{}", A::type_name(), B::type_name()))
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}
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fn create_type_info(registry: &mut Registry) -> String {
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registry.create_type::<Self, _>(|registry| {
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let mut fields = IndexMap::new();
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let mut cc = CacheControl::default();
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if let MetaType::Object {
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fields: a_fields,
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cache_control: a_cc,
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..
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} = registry.create_dummy_type::<A>()
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{
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fields.extend(a_fields);
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cc = cc.merge(&a_cc);
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}
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if let MetaType::Object {
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fields: b_fields,
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cache_control: b_cc,
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..
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} = registry.create_dummy_type::<B>()
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{
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fields.extend(b_fields);
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cc = cc.merge(&b_cc);
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}
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MetaType::Object {
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name: Self::type_name().to_string(),
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description: None,
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fields,
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cache_control: cc,
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extends: false,
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keys: None,
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}
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})
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}
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}
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#[async_trait::async_trait]
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impl<A, B> ContainerType for MergedObject<A, B>
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where
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A: ObjectType + Send + Sync,
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B: ObjectType + Send + Sync,
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{
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async fn resolve_field(&self, ctx: &Context<'_>) -> ServerResult<Option<Value>> {
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match self.0.resolve_field(ctx).await {
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Ok(Some(value)) => Ok(Some(value)),
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Ok(None) => self.1.resolve_field(ctx).await,
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Err(err) => Err(err),
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}
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}
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async fn find_entity(
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&self,
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ctx: &Context<'_>,
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params: &ConstValue,
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) -> ServerResult<Option<ConstValue>> {
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match self.0.find_entity(ctx, params).await {
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Ok(Some(value)) => Ok(Some(value)),
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Ok(None) => self.1.find_entity(ctx, params).await,
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Err(err) => Err(err),
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}
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}
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}
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#[async_trait::async_trait]
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impl<A, B> OutputType for MergedObject<A, B>
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where
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A: ObjectType + Send + Sync,
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B: ObjectType + Send + Sync,
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{
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async fn resolve(
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&self,
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ctx: &ContextSelectionSet<'_>,
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_field: &Positioned<Field>,
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) -> ServerResult<Value> {
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resolve_container(ctx, self).await
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}
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}
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impl<A, B> ObjectType for MergedObject<A, B>
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where
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A: ObjectType + Send + Sync,
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B: ObjectType + Send + Sync,
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{
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}
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#[doc(hidden)]
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#[derive(SimpleObject, Default)]
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#[graphql(internal, dummy)]
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pub struct MergedObjectTail;
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