127 lines
3.9 KiB
Rust
127 lines
3.9 KiB
Rust
use crate::{
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do_resolve, registry, Context, ContextSelectionSet, ObjectType, OutputValueType, Pos, Result,
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Type,
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};
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use indexmap::map::IndexMap;
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use std::borrow::Cow;
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pub struct Edge<'a, T, E> {
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pub cursor: &'a str,
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pub node: &'a T,
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pub extra_type: &'a E,
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}
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impl<'a, T, E> Edge<'a, T, E>
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where
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T: OutputValueType + Send + Sync + 'a,
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E: ObjectType + Sync + Send + 'a,
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{
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#[doc(hidden)]
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#[inline]
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pub async fn node(&self) -> &T {
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self.node
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}
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#[doc(hidden)]
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#[inline]
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pub async fn cursor(&self) -> &str {
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self.cursor
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}
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}
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impl<'a, T, E> Type for Edge<'a, T, E>
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where
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T: OutputValueType + Send + Sync + 'a,
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E: ObjectType + Sync + Send + 'a,
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{
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fn type_name() -> Cow<'static, str> {
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Cow::Owned(format!("{}Edge", T::type_name()))
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}
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fn create_type_info(registry: &mut registry::Registry) -> String {
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registry.create_type::<Self, _>(|registry| {
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E::create_type_info(registry);
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let extra_fields = if let Some(registry::MetaType::Object { fields, .. }) =
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registry.types.remove(E::type_name().as_ref())
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{
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fields
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} else {
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unreachable!()
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};
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registry::MetaType::Object {
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name: Self::type_name().to_string(),
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description: Some("An edge in a connection."),
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fields: {
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let mut fields = IndexMap::new();
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fields.insert(
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"node".to_string(),
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registry::MetaField {
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name: "node".to_string(),
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description: Some("The item at the end of the edge"),
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args: Default::default(),
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ty: T::create_type_info(registry),
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deprecation: None,
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cache_control: Default::default(),
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external: false,
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requires: None,
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provides: None,
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},
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);
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fields.insert(
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"cursor".to_string(),
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registry::MetaField {
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name: "cursor".to_string(),
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description: Some("A cursor for use in pagination"),
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args: Default::default(),
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ty: String::create_type_info(registry),
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deprecation: None,
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cache_control: Default::default(),
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external: false,
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requires: None,
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provides: None,
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},
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);
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fields.extend(extra_fields);
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fields
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},
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cache_control: Default::default(),
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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, T, E> ObjectType for Edge<'a, T, E>
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where
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T: OutputValueType + Send + Sync + 'a,
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E: ObjectType + Sync + Send + 'a,
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{
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async fn resolve_field(&self, ctx: &Context<'_>) -> Result<serde_json::Value> {
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if ctx.name.node == "node" {
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let ctx_obj = ctx.with_selection_set(&ctx.selection_set);
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return OutputValueType::resolve(self.node().await, &ctx_obj, ctx.position()).await;
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} else if ctx.name.node == "cursor" {
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return Ok(self.cursor().await.into());
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}
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self.extra_type.resolve_field(ctx).await
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}
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}
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#[async_trait::async_trait]
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impl<'a, T, E> OutputValueType for Edge<'a, T, E>
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where
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T: OutputValueType + Send + Sync + 'a,
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E: ObjectType + Sync + Send + 'a,
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{
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async fn resolve(&self, ctx: &ContextSelectionSet<'_>, _pos: Pos) -> Result<serde_json::Value> {
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do_resolve(ctx, self).await
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}
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}
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