Trait async_graphql::resolver_utils::ScalarType [−][src]
pub trait ScalarType: Sized + Send { fn parse(value: Value) -> InputValueResult<Self>; fn to_value(&self) -> Value; fn is_valid(_value: &Value) -> bool { ... } }
Expand description
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::Number(n) = &value { if let Some(n) = n.as_i64() { return Ok(MyInt(n as i32)); } } Err(InputValueError::expected_type(value)) } fn to_value(&self) -> Value { Value::Number(self.0.into()) } }
Required methods
fn parse(value: Value) -> InputValueResult<Self>
fn parse(value: Value) -> InputValueResult<Self>
Parse a scalar value.
Provided methods
Implementations on Foreign Types
A scalar that can represent any JSON value.
The Boolean
scalar type represents true
or false
.
The Char
scalar type represents a unicode char.
The input and output values are a string, and there can only be one unicode character in this string.
The Float
scalar type represents signed double-precision fractional values as specified by IEEE 754.
The Float
scalar type represents signed double-precision fractional values as specified by IEEE 754.
The Int
scalar type represents non-fractional whole numeric values.
The Int
scalar type represents non-fractional whole numeric values.
The Int
scalar type represents non-fractional whole numeric values.
The Int
scalar type represents non-fractional whole numeric values.
The Int
scalar type represents non-fractional whole numeric values.
The Int
scalar type represents non-fractional whole numeric values.
The Int
scalar type represents non-fractional whole numeric values.
The Int
scalar type represents non-fractional whole numeric values.
The Int
scalar type represents non-fractional whole numeric values.
The Int
scalar type represents non-fractional whole numeric values.
A scalar that can represent any JSON Object value.
A scalar that can represent any JSON Object value.
The Int
scalar type represents non-fractional whole numeric values.
The Int
scalar type represents non-fractional whole numeric values.
The Int
scalar type represents non-fractional whole numeric values.
The Int
scalar type represents non-fractional whole numeric values.
The Int
scalar type represents non-fractional whole numeric values.
The Int
scalar type represents non-fractional whole numeric values.
The Int
scalar type represents non-fractional whole numeric values.
The Int
scalar type represents non-fractional whole numeric values.
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.
Implement the DateTime
The input/output is a string in RFC3339 format.
Implement the DateTime
The input/output is a string in RFC3339 format.
Implement the DateTime
The input/output is a string in RFC3339 format.
Implementors
impl<T: Num + Display + Send + Sync> ScalarType for StringNumber<T> where
<T as Num>::FromStrRadixErr: Display,