Enum AsyncResolvedValue 

pub enum AsyncResolvedValue<'a> {
    Leaf(JsonValue),
    Object(Box<dyn AsyncObjectValue + 'a>),
    List(BoxStream<'a, Result<Self, FieldError>>),
    SkipForPartialExecution,
}

The successful return type of AsyncObjectValue::resolve_field.

Variants

Leaf(JsonValue)

• JSON null represents GraphQL null
• A GraphQL enum value is represented as a JSON string
• GraphQL built-in scalars are coerced according to their respective Result Coercion spec
• For custom scalars, any JSON value is passed through as-is (including array or object)

Object(Box<dyn AsyncObjectValue + 'a>)

Expected where the GraphQL type is an object, interface, or union type

List(BoxStream<'a, Result<Self, FieldError>>)

Expected for GraphQL list types

SkipForPartialExecution

Skip this field as if the selection had @skip(if: true): do not insert null nor emit an error.

This causes the eventual response data to be incomplete. This can be useful to have some fields executed with per-field resolvers by this API and other fields with some other execution model such as Apollo Federation, with the two response data maps merged before sending the response.

This is used by introspection::partial_execute.

Implementations

impl<'a> AsyncResolvedValue<'a>

pub fn null() -> Self

Construct a null leaf resolved value

pub fn leaf(json: impl Into<JsonValue>) -> Self

Construct a leaf resolved value from something that is convertible to JSON

pub fn object(object: impl AsyncObjectValue + 'a) -> Self

Construct an object resolved value

pub fn nullable_object(opt_object: Option<impl AsyncObjectValue + 'a>) -> Self

Construct an object resolved value or null

pub fn list<I>(iter: I) -> Self

where I: IntoIterator<Item = Self>, I::IntoIter: 'a + Send,

Construct a list resolved value from an iterator

If errors can happen during iteration, construct the ResolvedValue::List enum variant directly instead.