Trait async_graphql::resolver_utils::ContainerType
source · pub trait ContainerType: OutputType {
fn resolve_field<'life0, 'life1, 'life2, 'async_trait>(
&'life0 self,
ctx: &'life1 Context<'life2>
) -> Pin<Box<dyn Future<Output = ServerResult<Option<Value>>> + Send + 'async_trait>>
where
Self: 'async_trait,
'life0: 'async_trait,
'life1: 'async_trait,
'life2: 'async_trait;
fn collect_all_fields<'a>(
&'a self,
ctx: &ContextSelectionSet<'a>,
fields: &mut Fields<'a>
) -> ServerResult<()>
where
Self: Send + Sync,
{ ... }
fn find_entity<'life0, 'life1, 'life2, 'life3, 'async_trait>(
&'life0 self,
__arg1: &'life1 Context<'life2>,
_params: &'life3 Value
) -> Pin<Box<dyn Future<Output = ServerResult<Option<Value>>> + Send + 'async_trait>>
where
Self: Sync + 'async_trait,
'life0: 'async_trait,
'life1: 'async_trait,
'life2: 'async_trait,
'life3: 'async_trait,
{ ... }
}Expand description
Represents a GraphQL container object.
This helper trait allows the type to call resolve_container on itself in
its OutputType::resolve implementation.
Required Methods§
sourcefn resolve_field<'life0, 'life1, 'life2, 'async_trait>(
&'life0 self,
ctx: &'life1 Context<'life2>
) -> Pin<Box<dyn Future<Output = ServerResult<Option<Value>>> + Send + 'async_trait>>where
Self: 'async_trait,
'life0: 'async_trait,
'life1: 'async_trait,
'life2: 'async_trait,
fn resolve_field<'life0, 'life1, 'life2, 'async_trait>(
&'life0 self,
ctx: &'life1 Context<'life2>
) -> Pin<Box<dyn Future<Output = ServerResult<Option<Value>>> + Send + 'async_trait>>where
Self: 'async_trait,
'life0: 'async_trait,
'life1: 'async_trait,
'life2: 'async_trait,
Resolves a field value and outputs it as a json value
async_graphql::Value.
If the field was not found returns None.
Provided Methods§
sourcefn collect_all_fields<'a>(
&'a self,
ctx: &ContextSelectionSet<'a>,
fields: &mut Fields<'a>
) -> ServerResult<()>where
Self: Send + Sync,
fn collect_all_fields<'a>(
&'a self,
ctx: &ContextSelectionSet<'a>,
fields: &mut Fields<'a>
) -> ServerResult<()>where
Self: Send + Sync,
Collect all the fields of the container that are queried in the selection set.
Objects do not have to override this, but interfaces and unions must call it on their internal type.
Examples found in repository?
src/resolver_utils/container.rs (line 346)
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pub fn add_set<T: ContainerType + ?Sized>(
&mut self,
ctx: &ContextSelectionSet<'a>,
root: &'a T,
) -> ServerResult<()> {
for selection in &ctx.item.node.items {
match &selection.node {
Selection::Field(field) => {
if field.node.name.node == "__typename" {
// Get the typename
let ctx_field = ctx.with_field(field);
let field_name = ctx_field.item.node.response_key().node.clone();
let typename = root.introspection_type_name().into_owned();
self.0.push(Box::pin(async move {
Ok((field_name, Value::String(typename)))
}));
continue;
}
let resolve_fut = Box::pin({
let ctx = ctx.clone();
async move {
let ctx_field = ctx.with_field(field);
let field_name = ctx_field.item.node.response_key().node.clone();
let extensions = &ctx.query_env.extensions;
if extensions.is_empty() && field.node.directives.is_empty() {
Ok((
field_name,
root.resolve_field(&ctx_field).await?.unwrap_or_default(),
))
} else {
let type_name = T::type_name();
let resolve_info = ResolveInfo {
path_node: ctx_field.path_node.as_ref().unwrap(),
parent_type: &type_name,
return_type: match ctx_field
.schema_env
.registry
.types
.get(type_name.as_ref())
.and_then(|ty| {
ty.field_by_name(field.node.name.node.as_str())
})
.map(|field| &field.ty)
{
Some(ty) => &ty,
None => {
return Err(ServerError::new(
format!(
r#"Cannot query field "{}" on type "{}"."#,
field_name, type_name
),
Some(ctx_field.item.pos),
));
}
},
name: field.node.name.node.as_str(),
alias: field
.node
.alias
.as_ref()
.map(|alias| alias.node.as_str()),
is_for_introspection: ctx_field.is_for_introspection,
};
let resolve_fut = root.resolve_field(&ctx_field);
if field.node.directives.is_empty() {
futures_util::pin_mut!(resolve_fut);
Ok((
field_name,
extensions
.resolve(resolve_info, &mut resolve_fut)
.await?
.unwrap_or_default(),
))
} else {
let mut resolve_fut = resolve_fut.boxed();
for directive in &field.node.directives {
if let Some(directive_factory) = ctx
.schema_env
.custom_directives
.get(directive.node.name.node.as_str())
{
let ctx_directive = ContextBase {
path_node: ctx_field.path_node,
is_for_introspection: false,
item: directive,
schema_env: ctx_field.schema_env,
query_env: ctx_field.query_env,
};
let directive_instance = directive_factory
.create(&ctx_directive, &directive.node)?;
resolve_fut = Box::pin({
let ctx_field = ctx_field.clone();
async move {
directive_instance
.resolve_field(&ctx_field, &mut resolve_fut)
.await
}
});
}
}
Ok((
field_name,
extensions
.resolve(resolve_info, &mut resolve_fut)
.await?
.unwrap_or_default(),
))
}
}
}
});
self.0.push(resolve_fut);
}
selection => {
let (type_condition, selection_set) = match selection {
Selection::Field(_) => unreachable!(),
Selection::FragmentSpread(spread) => {
let fragment =
ctx.query_env.fragments.get(&spread.node.fragment_name.node);
let fragment = match fragment {
Some(fragment) => fragment,
None => {
return Err(ServerError::new(
format!(
r#"Unknown fragment "{}"."#,
spread.node.fragment_name.node
),
Some(spread.pos),
));
}
};
(
Some(&fragment.node.type_condition),
&fragment.node.selection_set,
)
}
Selection::InlineFragment(fragment) => (
fragment.node.type_condition.as_ref(),
&fragment.node.selection_set,
),
};
let type_condition =
type_condition.map(|condition| condition.node.on.node.as_str());
let introspection_type_name = root.introspection_type_name();
let applies_concrete_object = type_condition.map_or(false, |condition| {
introspection_type_name == condition
|| ctx
.schema_env
.registry
.implements
.get(&*introspection_type_name)
.map_or(false, |interfaces| interfaces.contains(condition))
});
if applies_concrete_object {
root.collect_all_fields(&ctx.with_selection_set(selection_set), self)?;
} else if type_condition.map_or(true, |condition| T::type_name() == condition) {
// The fragment applies to an interface type.
self.add_set(&ctx.with_selection_set(selection_set), root)?;
}
}
}
}
Ok(())
}sourcefn find_entity<'life0, 'life1, 'life2, 'life3, 'async_trait>(
&'life0 self,
__arg1: &'life1 Context<'life2>,
_params: &'life3 Value
) -> Pin<Box<dyn Future<Output = ServerResult<Option<Value>>> + Send + 'async_trait>>where
Self: Sync + 'async_trait,
'life0: 'async_trait,
'life1: 'async_trait,
'life2: 'async_trait,
'life3: 'async_trait,
fn find_entity<'life0, 'life1, 'life2, 'life3, 'async_trait>(
&'life0 self,
__arg1: &'life1 Context<'life2>,
_params: &'life3 Value
) -> Pin<Box<dyn Future<Output = ServerResult<Option<Value>>> + Send + 'async_trait>>where
Self: Sync + 'async_trait,
'life0: 'async_trait,
'life1: 'async_trait,
'life2: 'async_trait,
'life3: 'async_trait,
Find the GraphQL entity with the given name from the parameter.
Objects should override this in case they are the query root.
Examples found in repository?
src/resolver_utils/container.rs (line 60)
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async fn find_entity(&self, ctx: &Context<'_>, params: &Value) -> ServerResult<Option<Value>> {
T::find_entity(*self, ctx, params).await
}
}
#[async_trait::async_trait]
impl<T: ContainerType + ?Sized> ContainerType for Arc<T> {
async fn resolve_field(&self, ctx: &Context<'_>) -> ServerResult<Option<Value>> {
T::resolve_field(self, ctx).await
}
async fn find_entity(&self, ctx: &Context<'_>, params: &Value) -> ServerResult<Option<Value>> {
T::find_entity(self, ctx, params).await
}
}
#[async_trait::async_trait]
impl<T: ContainerType + ?Sized> ContainerType for Box<T> {
async fn resolve_field(&self, ctx: &Context<'_>) -> ServerResult<Option<Value>> {
T::resolve_field(self, ctx).await
}
async fn find_entity(&self, ctx: &Context<'_>, params: &Value) -> ServerResult<Option<Value>> {
T::find_entity(self, ctx, params).await
}
}
#[async_trait::async_trait]
impl<T: ContainerType, E: Into<Error> + Send + Sync + Clone> ContainerType for Result<T, E> {
async fn resolve_field(&self, ctx: &Context<'_>) -> ServerResult<Option<Value>> {
match self {
Ok(value) => T::resolve_field(value, ctx).await,
Err(err) => Err(ctx.set_error_path(err.clone().into().into_server_error(ctx.item.pos))),
}
}
async fn find_entity(&self, ctx: &Context<'_>, params: &Value) -> ServerResult<Option<Value>> {
match self {
Ok(value) => T::find_entity(value, ctx, params).await,
Err(err) => Err(ctx.set_error_path(err.clone().into().into_server_error(ctx.item.pos))),
}
}More examples
src/types/query_root.rs (line 76)
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async fn resolve_field(&self, ctx: &Context<'_>) -> ServerResult<Option<Value>> {
if matches!(
ctx.schema_env.registry.introspection_mode,
IntrospectionMode::Enabled | IntrospectionMode::IntrospectionOnly
) && matches!(
ctx.query_env.introspection_mode,
IntrospectionMode::Enabled | IntrospectionMode::IntrospectionOnly,
) {
if ctx.item.node.name.node == "__schema" {
let mut ctx_obj = ctx.with_selection_set(&ctx.item.node.selection_set);
ctx_obj.is_for_introspection = true;
let visible_types = ctx.schema_env.registry.find_visible_types(ctx);
return OutputType::resolve(
&__Schema::new(&ctx.schema_env.registry, &visible_types),
&ctx_obj,
ctx.item,
)
.await
.map(Some);
} else if ctx.item.node.name.node == "__type" {
let (_, type_name) = ctx.param_value::<String>("name", None)?;
let mut ctx_obj = ctx.with_selection_set(&ctx.item.node.selection_set);
ctx_obj.is_for_introspection = true;
let visible_types = ctx.schema_env.registry.find_visible_types(ctx);
return OutputType::resolve(
&ctx.schema_env
.registry
.types
.get(&type_name)
.filter(|_| visible_types.contains(type_name.as_str()))
.map(|ty| __Type::new_simple(&ctx.schema_env.registry, &visible_types, ty)),
&ctx_obj,
ctx.item,
)
.await
.map(Some);
}
}
if ctx.schema_env.registry.introspection_mode == IntrospectionMode::IntrospectionOnly
|| ctx.query_env.introspection_mode == IntrospectionMode::IntrospectionOnly
{
return Ok(None);
}
if ctx.schema_env.registry.enable_federation || ctx.schema_env.registry.has_entities() {
if ctx.item.node.name.node == "_entities" {
let (_, representations) = ctx.param_value::<Vec<Any>>("representations", None)?;
let res = futures_util::future::try_join_all(representations.iter().map(
|item| async move {
self.inner.find_entity(ctx, &item.0).await?.ok_or_else(|| {
ServerError::new("Entity not found.", Some(ctx.item.pos))
})
},
))
.await?;
return Ok(Some(Value::List(res)));
} else if ctx.item.node.name.node == "_service" {
let mut ctx_obj = ctx.with_selection_set(&ctx.item.node.selection_set);
ctx_obj.is_for_introspection = true;
return OutputType::resolve(
&Service {
sdl: Some(
ctx.schema_env
.registry
.export_sdl(SDLExportOptions::new().federation()),
),
},
&ctx_obj,
ctx.item,
)
.await
.map(Some);
}
}
self.inner.resolve_field(ctx).await
}