[−][src]Trait async_graphql::ScalarType
Represents a GraphQL scalar
You can implement the trait to create a custom scalar.
Examples
use async_graphql::*; struct MyInt(i32); #[Scalar] impl ScalarType for MyInt { fn parse(value: Value) -> InputValueResult<Self> { if let Value::Int(n) = value { Ok(MyInt(n as i32)) } else { Err(InputValueError::ExpectedType(value)) } } fn to_value(&self) -> Value { Value::Int(self.0) } }
Required methods
fn parse(value: Value) -> InputValueResult<Self>
Parse a scalar value, return Some(Self)
if successful, otherwise return None
.
fn to_value(&self) -> Value
Convert the scalar to Value
.
Provided methods
fn is_valid(_value: &Value) -> bool
Checks for a valid scalar value.
Implementing this function can find incorrect input values during the verification phase, which can improve performance.
Implementations on Foreign Types
impl ScalarType for bool
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The Boolean
scalar type represents true
or false
.
fn parse(value: Value) -> InputValueResult<Self>
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fn is_valid(value: &Value) -> bool
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fn to_value(&self) -> Value
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impl ScalarType for DateTime<Utc>
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Implement the DateTime
The input/output is a string in RFC3339 format.
impl ScalarType for f32
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The Float
scalar type represents signed double-precision fractional values as specified by IEEE 754.
fn parse(value: Value) -> InputValueResult<Self>
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fn is_valid(value: &Value) -> bool
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fn to_value(&self) -> Value
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impl ScalarType for f64
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The Float
scalar type represents signed double-precision fractional values as specified by IEEE 754.
fn parse(value: Value) -> InputValueResult<Self>
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fn is_valid(value: &Value) -> bool
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fn to_value(&self) -> Value
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impl ScalarType for i8
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The Int
scalar type represents non-fractional signed whole numeric values. Int can represent values between -(2^31) and 2^31 - 1.
fn parse(value: Value) -> InputValueResult<Self>
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fn is_valid(value: &Value) -> bool
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fn to_value(&self) -> Value
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impl ScalarType for i16
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The Int
scalar type represents non-fractional signed whole numeric values. Int can represent values between -(2^31) and 2^31 - 1.
fn parse(value: Value) -> InputValueResult<Self>
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fn is_valid(value: &Value) -> bool
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fn to_value(&self) -> Value
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impl ScalarType for i32
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The Int
scalar type represents non-fractional signed whole numeric values. Int can represent values between -(2^31) and 2^31 - 1.
fn parse(value: Value) -> InputValueResult<Self>
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fn is_valid(value: &Value) -> bool
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fn to_value(&self) -> Value
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impl ScalarType for u8
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The Int
scalar type represents non-fractional signed whole numeric values. Int can represent values between -(2^31) and 2^31 - 1.
fn parse(value: Value) -> InputValueResult<Self>
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fn is_valid(value: &Value) -> bool
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fn to_value(&self) -> Value
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impl ScalarType for u16
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The Int
scalar type represents non-fractional signed whole numeric values. Int can represent values between -(2^31) and 2^31 - 1.
fn parse(value: Value) -> InputValueResult<Self>
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fn is_valid(value: &Value) -> bool
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fn to_value(&self) -> Value
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impl ScalarType for i64
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The Int64
scalar type represents non-fractional signed whole numeric values. Int can represent values between -(2^64) and 2^64 - 1.
fn parse(value: Value) -> InputValueResult<Self>
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fn is_valid(value: &Value) -> bool
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fn to_value(&self) -> Value
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impl ScalarType for u32
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The UInt64
scalar type represents non-fractional signed whole numeric values. Int can represent values between 0 and 2^64.
fn parse(value: Value) -> InputValueResult<Self>
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fn is_valid(value: &Value) -> bool
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fn to_value(&self) -> Value
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impl ScalarType for u64
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The UInt64
scalar type represents non-fractional signed whole numeric values. Int can represent values between 0 and 2^64.
fn parse(value: Value) -> InputValueResult<Self>
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fn is_valid(value: &Value) -> bool
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fn to_value(&self) -> Value
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impl ScalarType for NaiveDate
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impl ScalarType for NaiveTime
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impl ScalarType for String
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The String
scalar type represents textual data, represented as UTF-8 character sequences. The String type is most often used by GraphQL to represent free-form human-readable text.
fn parse(value: Value) -> InputValueResult<Self>
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fn is_valid(value: &Value) -> bool
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fn to_value(&self) -> Value
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impl ScalarType for Uuid
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impl ScalarType for ObjectId
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impl ScalarType for UtcDateTime
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impl ScalarType for Url
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Loading content...
Implementors
impl ScalarType for Any
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The _Any
scalar is used to pass representations of entities from external services into the root _entities
field for execution.
fn parse(value: Value) -> InputValueResult<Self>
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fn is_valid(_value: &Value) -> bool
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fn to_value(&self) -> Value
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impl ScalarType for ID
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fn parse(value: Value) -> InputValueResult<Self>
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fn is_valid(value: &Value) -> bool
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fn to_value(&self) -> Value
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impl<T: DeserializeOwned + Serialize + Send + Sync> ScalarType for Json<T>
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A scalar that can represent any JSON value.