Enum Value

pub enum Value {
    Null,
    Number(Number),
    String(String),
    Boolean(bool),
    Binary(Bytes),
    Enum(Name),
    List(Vec<ConstValue>),
    Object(IndexMap<Name, ConstValue>),
}

A resolved GraphQL value, for example 1 or "Hello World!".

It can be serialized and deserialized. Enums will be converted to strings. Attempting to serialize Upload will fail, and Enum and Upload cannot be deserialized.

Reference.

Variants

Null

null.

Number(Number)

A number.

String(String)

A string.

Boolean(bool)

A boolean.

Binary(Bytes)

A binary.

Enum(Name)

An enum. These are typically in SCREAMING_SNAKE_CASE.

List(Vec<ConstValue>)

A list of values.

Object(IndexMap<Name, ConstValue>)

An object. This is a map of keys to values.

Implementations

impl ConstValue

pub fn into_value(self) -> Value

Convert this ConstValue into a Value.

pub fn into_json(self) -> Result<Value, Error>

Attempt to convert the value into JSON. This is equivalent to the TryFrom implementation.

Errors

Fails if serialization fails (see enum docs for more info).

pub fn from_json(json: Value) -> Result<ConstValue, Error>

Attempt to convert JSON into a value. This is equivalent to the TryFrom implementation.

Errors

Fails if deserialization fails (see enum docs for more info).

Trait Implementations

impl Clone for ConstValue

fn clone(&self) -> ConstValue

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for ConstValue

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

Formats the value using the given formatter.

impl Default for ConstValue

fn default() -> ConstValue

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for ConstValue

fn deserialize<D>( deserializer: D, ) -> Result<ConstValue, <D as Deserializer<'de>>::Error>

where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl<'de> Deserializer<'de> for ConstValue

type Error = DeserializerError

The error type that can be returned if some error occurs during deserialization.

fn deserialize_any<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <ConstValue as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Require the Deserializer to figure out how to drive the visitor based on what data type is in the input.

fn deserialize_bool<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <ConstValue as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a bool value.

fn deserialize_i8<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <ConstValue as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting an i8 value.

fn deserialize_i16<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <ConstValue as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting an i16 value.

fn deserialize_i32<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <ConstValue as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting an i32 value.

fn deserialize_i64<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <ConstValue as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting an i64 value.

fn deserialize_i128<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <ConstValue as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting an i128 value.

fn deserialize_u8<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <ConstValue as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a u8 value.

fn deserialize_u16<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <ConstValue as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a u16 value.

fn deserialize_u32<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <ConstValue as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a u32 value.

fn deserialize_u64<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <ConstValue as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a u64 value.

fn deserialize_u128<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <ConstValue as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting an u128 value.

fn deserialize_f32<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <ConstValue as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a f32 value.

fn deserialize_f64<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <ConstValue as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a f64 value.

fn deserialize_char<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <ConstValue as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a char value.

fn deserialize_str<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <ConstValue as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a string value and does not benefit from taking ownership of buffered data owned by the Deserializer.

fn deserialize_string<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <ConstValue as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a string value and would benefit from taking ownership of buffered data owned by the Deserializer.

fn deserialize_bytes<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <ConstValue as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a byte array and does not benefit from taking ownership of buffered data owned by the Deserializer.

fn deserialize_byte_buf<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <ConstValue as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a byte array and would benefit from taking ownership of buffered data owned by the Deserializer.

fn deserialize_unit<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <ConstValue as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a unit value.

fn deserialize_unit_struct<V>( self, name: &'static str, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <ConstValue as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a unit struct with a particular name.

fn deserialize_seq<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <ConstValue as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a sequence of values.

fn deserialize_tuple<V>( self, len: usize, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <ConstValue as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a sequence of values and knows how many values there are without looking at the serialized data.

fn deserialize_tuple_struct<V>( self, name: &'static str, len: usize, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <ConstValue as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a tuple struct with a particular name and number of fields.

fn deserialize_map<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <ConstValue as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a map of key-value pairs.

fn deserialize_struct<V>( self, name: &'static str, fields: &'static [&'static str], visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <ConstValue as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a struct with a particular name and fields.

fn deserialize_identifier<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <ConstValue as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting the name of a struct field or the discriminant of an enum variant.

fn deserialize_ignored_any<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <ConstValue as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type needs to deserialize a value whose type doesn’t matter because it is ignored.

fn deserialize_option<V>( self, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <ConstValue as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting an optional value.

fn deserialize_newtype_struct<V>( self, _name: &'static str, visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <ConstValue as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting a newtype struct with a particular name.

fn deserialize_enum<V>( self, _name: &'static str, _variants: &'static [&'static str], visitor: V, ) -> Result<<V as Visitor<'de>>::Value, <ConstValue as Deserializer<'de>>::Error>

where V: Visitor<'de>,

Hint that the Deserialize type is expecting an enum value with a particular name and possible variants.

fn is_human_readable(&self) -> bool

Determine whether Deserialize implementations should expect to deserialize their human-readable form.

impl Display for ConstValue

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

Formats the value using the given formatter.

impl<'a, T> From<&'a [T]> for ConstValue

where T: Clone + Into<ConstValue>,

fn from(f: &'a [T]) -> ConstValue

Converts to this type from the input type.

impl From<&String> for ConstValue

fn from(value: &String) -> ConstValue

Converts to this type from the input type.

impl<'a> From<&'a str> for ConstValue

fn from(value: &'a str) -> ConstValue

Converts to this type from the input type.

impl From<()> for ConstValue

fn from(_: ()) -> ConstValue

Converts to this type from the input type.

impl<'a> From<ConstValue> for FieldValue<'a>

Available on crate feature dynamic-schema only.

fn from(value: Value) -> Self

Converts to this type from the input type.

impl<'a> From<Cow<'a, str>> for ConstValue

fn from(f: Cow<'a, str>) -> ConstValue

Converts to this type from the input type.

impl From<ID> for ConstValue

fn from(id: ID) -> Self

Converts to this type from the input type.

impl From<IndexMap<Name, ConstValue>> for ConstValue

fn from(f: IndexMap<Name, ConstValue>) -> ConstValue

Converts to this type from the input type.

impl From<Name> for ConstValue

fn from(value: Name) -> ConstValue

Converts to this type from the input type.

impl From<String> for ConstValue

fn from(value: String) -> ConstValue

Converts to this type from the input type.

impl From<Variables> for ConstValue

fn from(variables: Variables) -> ConstValue

Converts to this type from the input type.

impl<T> From<Vec<T>> for ConstValue

where T: Into<ConstValue>,

fn from(f: Vec<T>) -> ConstValue

Converts to this type from the input type.

impl From<bool> for ConstValue

fn from(value: bool) -> ConstValue

Converts to this type from the input type.

impl From<f32> for ConstValue

fn from(f: f32) -> ConstValue

Converts to this type from the input type.

impl From<f64> for ConstValue

fn from(f: f64) -> ConstValue

Converts to this type from the input type.

impl From<i16> for ConstValue

fn from(n: i16) -> ConstValue

Converts to this type from the input type.

impl From<i32> for ConstValue

fn from(n: i32) -> ConstValue

Converts to this type from the input type.

impl From<i64> for ConstValue

fn from(n: i64) -> ConstValue

Converts to this type from the input type.

impl From<i8> for ConstValue

fn from(n: i8) -> ConstValue

Converts to this type from the input type.

impl From<isize> for ConstValue

fn from(n: isize) -> ConstValue

Converts to this type from the input type.

impl From<u16> for ConstValue

fn from(n: u16) -> ConstValue

Converts to this type from the input type.

impl From<u32> for ConstValue

fn from(n: u32) -> ConstValue

Converts to this type from the input type.

impl From<u64> for ConstValue

fn from(n: u64) -> ConstValue

Converts to this type from the input type.

impl From<u8> for ConstValue

fn from(n: u8) -> ConstValue

Converts to this type from the input type.

impl From<usize> for ConstValue

fn from(n: usize) -> ConstValue

Converts to this type from the input type.

impl<T> FromIterator<T> for ConstValue

where T: Into<ConstValue>,

fn from_iter<I>(iter: I) -> ConstValue

where I: IntoIterator<Item = T>,

Creates a value from an iterator.

impl<'de> IntoDeserializer<'de, DeserializerError> for ConstValue

type Deserializer = ConstValue

The type of the deserializer being converted into.

fn into_deserializer( self, ) -> <ConstValue as IntoDeserializer<'de, DeserializerError>>::Deserializer

Convert this value into a deserializer.

impl PartialEq for ConstValue

fn eq(&self, other: &ConstValue) -> bool

Tests for self and other values to be equal, and is used by ==.

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

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

impl Serialize for ConstValue

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

where S: Serializer,

Serialize this value into the given Serde serializer.

impl TryFrom<Value> for ConstValue

type Error = Error

The type returned in the event of a conversion error.

fn try_from( value: Value, ) -> Result<ConstValue, <ConstValue as TryFrom<Value>>::Error>

Performs the conversion.

impl Eq for ConstValue