78 lines
1.9 KiB
Rust
78 lines
1.9 KiB
Rust
use std::borrow::Cow;
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use crate::parser::types::Field;
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use crate::resolver_utils::ContainerType;
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use crate::{
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registry, Context, ContextSelectionSet, ObjectType, OutputType, Positioned, ServerError,
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ServerResult, Value,
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};
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/// Empty mutation
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///
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/// Only the parameters used to construct the Schema, representing an unconfigured mutation.
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///
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/// # Examples
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///
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/// ```rust
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/// use async_graphql::*;
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///
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/// struct QueryRoot;
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///
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/// #[Object]
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/// impl QueryRoot {
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/// async fn value(&self) -> i32 {
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/// // A GraphQL Object type must define one or more fields.
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/// 100
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/// }
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/// }
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///
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/// let schema = Schema::new(QueryRoot, EmptyMutation, EmptySubscription);
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/// ```
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#[derive(Default, Copy, Clone)]
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pub struct EmptyMutation;
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#[async_trait::async_trait]
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impl ContainerType for EmptyMutation {
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fn is_empty() -> bool {
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true
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}
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async fn resolve_field(&self, _ctx: &Context<'_>) -> ServerResult<Option<Value>> {
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Ok(None)
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}
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}
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#[async_trait::async_trait]
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impl OutputType for EmptyMutation {
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fn type_name() -> Cow<'static, str> {
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Cow::Borrowed("EmptyMutation")
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}
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fn create_type_info(registry: &mut registry::Registry) -> String {
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registry.create_output_type::<Self, _>(|_| registry::MetaType::Object {
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name: "EmptyMutation".to_string(),
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description: None,
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fields: Default::default(),
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cache_control: Default::default(),
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extends: false,
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keys: None,
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visible: None,
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is_subscription: false,
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rust_typename: std::any::type_name::<Self>(),
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})
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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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Err(ServerError::new(
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"Schema is not configured for mutations.",
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None,
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))
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}
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}
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impl ObjectType for EmptyMutation {}
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