Enum juniper::Value

pub enum Value<S = DefaultScalarValue> {
    Null,
    Scalar(S),
    List(Vec<Value<S>>),
    Object(Object<S>),
}

Serializable value returned from query and field execution.

Used by the execution engine and resolvers to build up the response structure. Similar to the Json type found in the serialize crate.

It is also similar to the InputValue type, but can not contain enum values or variables. Also, lists and objects do not contain any location information since they are generated by resolving fields and values rather than parsing a source query.

Variants

Null

Scalar(S)

List(Vec<Value<S>>)

Object(Object<S>)

Implementations

impl<S> Value<S>

pub fn null() -> Self

Construct a null value.

pub fn list(l: Vec<Self>) -> Self

Construct a list value.

pub fn object(o: Object<S>) -> Self

Construct an object value.

pub fn scalar<T>(s: T) -> Self

where S: From<T>,

Construct a scalar value

pub fn is_null(&self) -> bool

Does this value represent null?

pub fn as_scalar_value<'a, T>(&'a self) -> Option<&'a T>

where Option<&'a T>: From<&'a S>,

View the underlying scalar value if present

pub fn as_float_value(&self) -> Option<f64>

where S: ScalarValue,

View the underlying float value, if present.

pub fn as_object_value(&self) -> Option<&Object<S>>

View the underlying object value, if present.

pub fn into_object(self) -> Option<Object<S>>

Convert this value into an Object.

Returns None if value is not an Object.

pub fn as_mut_object_value(&mut self) -> Option<&mut Object<S>>

Mutable view into the underlying object value, if present.

pub fn as_list_value(&self) -> Option<&Vec<Self>>

View the underlying list value, if present.

pub fn as_scalar(&self) -> Option<&S>

View the underlying scalar value, if present

pub fn as_string_value<'a>(&'a self) -> Option<&'a str>

where Option<&'a String>: From<&'a S>,

View the underlying string value, if present.

pub fn map_scalar_value<Into>(self) -> Value<Into>

where S: ScalarValue, Into: ScalarValue,

Maps the ScalarValue type of this Value into the specified one.

Trait Implementations

impl<S: Clone> Clone for Value<S>

fn clone(&self) -> Value<S>

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<S: Debug> Debug for Value<S>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<S: ScalarValue> Display for Value<S>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'a, S: From<String>> From<&'a str> for Value<S>

fn from(s: &'a str) -> Self

Converts to this type from the input type.

impl<'a, S: From<String>> From<Cow<'a, str>> for Value<S>

fn from(s: Cow<'a, str>) -> Self

Converts to this type from the input type.

impl<S> From<Object<S>> for Value<S>

fn from(o: Object<S>) -> Self

Converts to this type from the input type.

impl<S, T> From<Option<T>> for Value<S>

where Self: From<T>,

fn from(v: Option<T>) -> Self

Converts to this type from the input type.

impl<S: From<String>> From<String> for Value<S>

fn from(s: String) -> Self

Converts to this type from the input type.

impl<S: From<bool>> From<bool> for Value<S>

fn from(b: bool) -> Self

Converts to this type from the input type.

impl<S: From<f64>> From<f64> for Value<S>

fn from(f: f64) -> Self

Converts to this type from the input type.

impl<S: From<i32>> From<i32> for Value<S>

fn from(i: i32) -> Self

Converts to this type from the input type.

impl<S: PartialEq> PartialEq for Value<S>

fn eq(&self, other: &Value<S>) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<T: Serialize> Serialize for Value<T>

fn serialize<S: Serializer>(&self, ser: S) -> Result<S::Ok, S::Error>

Serialize this value into the given Serde serializer.

impl<S: Clone> ToInputValue<S> for Value<S>

fn to_input_value(&self) -> InputValue<S>

Performs the conversion.

impl<S> StructuralPartialEq for Value<S>