Trait FromScalarValue 

pub trait FromScalarValue<'s, S: 's = DefaultScalarValue>: Sized {
    type Error: IntoFieldError<S> + 's;

    // Required method
    fn from_scalar_value(v: &'s S) -> Result<Self, Self::Error>;
}

Parsing of a ScalarValue into a Rust data type.

The conversion can fail, and must in that case return an Err.

Use the ScalarValue::try_to() method as a shortcut for this conversion.

Implementation

Implementing this trait for a type allows to specify this type directly in the from_input() function when implementing a GraphQLScalar via derive macro.

Also, #[derive(GraphQLScalar)] automatically implements this trait for a type.

Required Associated Types

type Error: IntoFieldError<S> + 's

Parsing error of a ScalarValue.

Required Methods

fn from_scalar_value(v: &'s S) -> Result<Self, Self::Error>

Parses the provided ScalarValue.

Errors

If this type cannot be parsed from the provided ScalarValue.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementations on Foreign Types

impl<'___a, Tz, __S> FromScalarValue<'___a, __S> for DateTime<Tz>

where Tz: TimeZone + FromFixedOffset, Tz::Offset: Display, __S: ScalarValue, Self: '___a,

Available on crate feature chrono only.

type Error = FieldError<__S>

fn from_scalar_value(input: &'___a __S) -> Result<Self, Self::Error>

impl<'___a, __S> FromScalarValue<'___a, __S> for Tz

where __S: ScalarValue, Self: '___a,

Available on crate feature chrono-tz only.

type Error = FieldError<__S>

fn from_scalar_value(input: &'___a __S) -> Result<Self, Self::Error>

impl<'___a, __S> FromScalarValue<'___a, __S> for BigDecimal

where __S: ScalarValue, Self: '___a,

Available on crate feature bigdecimal only.

type Error = FieldError<__S>

fn from_scalar_value(input: &'___a __S) -> Result<Self, Self::Error>

impl<'___a, __S> FromScalarValue<'___a, __S> for DateTime

where __S: ScalarValue, Self: '___a,

Available on crate feature bson only.

type Error = FieldError<__S>

fn from_scalar_value(input: &'___a __S) -> Result<Self, Self::Error>

impl<'___a, __S> FromScalarValue<'___a, __S> for ObjectId

where __S: ScalarValue, Self: '___a,

Available on crate feature bson only.

type Error = FieldError<__S>

fn from_scalar_value(input: &'___a __S) -> Result<Self, Self::Error>

impl<'___a, __S> FromScalarValue<'___a, __S> for NaiveDate

where __S: ScalarValue, Self: '___a,

Available on crate feature chrono only.

type Error = FieldError<__S>

fn from_scalar_value(input: &'___a __S) -> Result<Self, Self::Error>

impl<'___a, __S> FromScalarValue<'___a, __S> for NaiveDateTime

where __S: ScalarValue, Self: '___a,

Available on crate feature chrono only.

type Error = FieldError<__S>

fn from_scalar_value(input: &'___a __S) -> Result<Self, Self::Error>

impl<'___a, __S> FromScalarValue<'___a, __S> for NaiveTime

where __S: ScalarValue, Self: '___a,

Available on crate feature chrono only.

type Error = FieldError<__S>

fn from_scalar_value(input: &'___a __S) -> Result<Self, Self::Error>

impl<'___a, __S> FromScalarValue<'___a, __S> for CompactString

where __S: ScalarValue, Self: '___a,

type Error = FieldError<__S>

fn from_scalar_value(input: &'___a __S) -> Result<Self, Self::Error>

impl<'___a, __S> FromScalarValue<'___a, __S> for Date

where __S: ScalarValue, Self: '___a,

Available on crate feature jiff only.

type Error = FieldError<__S>

fn from_scalar_value(input: &'___a __S) -> Result<Self, Self::Error>

impl<'___a, __S> FromScalarValue<'___a, __S> for DateTime

where __S: ScalarValue, Self: '___a,

Available on crate feature jiff only.

type Error = FieldError<__S>

fn from_scalar_value(input: &'___a __S) -> Result<Self, Self::Error>

impl<'___a, __S> FromScalarValue<'___a, __S> for Time

where __S: ScalarValue, Self: '___a,

Available on crate feature jiff only.

type Error = FieldError<__S>

fn from_scalar_value(input: &'___a __S) -> Result<Self, Self::Error>

impl<'___a, __S> FromScalarValue<'___a, __S> for Span

where __S: ScalarValue, Self: '___a,

Available on crate feature jiff only.

type Error = FieldError<__S>

fn from_scalar_value(input: &'___a __S) -> Result<Self, Self::Error>

impl<'___a, __S> FromScalarValue<'___a, __S> for Timestamp

where __S: ScalarValue, Self: '___a,

Available on crate feature jiff only.

type Error = FieldError<__S>

fn from_scalar_value(input: &'___a __S) -> Result<Self, Self::Error>

impl<'___a, __S> FromScalarValue<'___a, __S> for Offset

where __S: ScalarValue, Self: '___a,

Available on crate feature jiff only.

type Error = FieldError<__S>

fn from_scalar_value(input: &'___a __S) -> Result<Self, Self::Error>

impl<'___a, __S> FromScalarValue<'___a, __S> for TimeZone

where __S: ScalarValue, Self: '___a,

Available on crate feature jiff only.

type Error = FieldError<__S>

fn from_scalar_value(input: &'___a __S) -> Result<Self, Self::Error>

impl<'___a, __S> FromScalarValue<'___a, __S> for Zoned

where __S: ScalarValue, Self: '___a,

Available on crate feature jiff only.

type Error = FieldError<__S>

fn from_scalar_value(input: &'___a __S) -> Result<Self, Self::Error>

impl<'___a, __S> FromScalarValue<'___a, __S> for Decimal

where __S: ScalarValue, Self: '___a,

Available on crate feature rust_decimal only.

type Error = FieldError<__S>

fn from_scalar_value(input: &'___a __S) -> Result<Self, Self::Error>

impl<'___a, __S> FromScalarValue<'___a, __S> for Date

where __S: ScalarValue, Self: '___a,

Available on crate feature time only.

type Error = FieldError<__S>

fn from_scalar_value(input: &'___a __S) -> Result<Self, Self::Error>

impl<'___a, __S> FromScalarValue<'___a, __S> for OffsetDateTime

where __S: ScalarValue, Self: '___a,

Available on crate feature time only.

type Error = FieldError<__S>

fn from_scalar_value(input: &'___a __S) -> Result<Self, Self::Error>

impl<'___a, __S> FromScalarValue<'___a, __S> for PrimitiveDateTime

where __S: ScalarValue, Self: '___a,

Available on crate feature time only.

type Error = FieldError<__S>

fn from_scalar_value(input: &'___a __S) -> Result<Self, Self::Error>

impl<'___a, __S> FromScalarValue<'___a, __S> for Time

where __S: ScalarValue, Self: '___a,

Available on crate feature time only.

type Error = FieldError<__S>

fn from_scalar_value(input: &'___a __S) -> Result<Self, Self::Error>

impl<'___a, __S> FromScalarValue<'___a, __S> for UtcOffset

where __S: ScalarValue, Self: '___a,

Available on crate feature time only.

type Error = FieldError<__S>

fn from_scalar_value(input: &'___a __S) -> Result<Self, Self::Error>

impl<'___a, __S> FromScalarValue<'___a, __S> for Url

where __S: ScalarValue, Self: '___a,

Available on crate feature url only.

type Error = FieldError<__S>

fn from_scalar_value(input: &'___a __S) -> Result<Self, Self::Error>

impl<'___a, __S> FromScalarValue<'___a, __S> for Uuid

where __S: ScalarValue, Self: '___a,

Available on crate feature uuid only.

type Error = FieldError<__S>

fn from_scalar_value(input: &'___a __S) -> Result<Self, Self::Error>

impl<'s, S> FromScalarValue<'s, S> for &'s str

where S: TryToPrimitive<'s, Self, Error: IntoFieldError<S>> + 's,

type Error = <S as TryToPrimitive<'s, &'s str>>::Error

fn from_scalar_value(v: &'s S) -> Result<Self, Self::Error>

impl<'s, S> FromScalarValue<'s, S> for bool

where S: TryToPrimitive<'s, Self, Error: IntoFieldError<S>> + 's,

type Error = <S as TryToPrimitive<'s, bool>>::Error

fn from_scalar_value(v: &'s S) -> Result<Self, Self::Error>

impl<'s, S> FromScalarValue<'s, S> for f64

where S: TryToPrimitive<'s, Self, Error: IntoFieldError<S>> + 's,

type Error = <S as TryToPrimitive<'s, f64>>::Error

fn from_scalar_value(v: &'s S) -> Result<Self, Self::Error>

impl<'s, S> FromScalarValue<'s, S> for i32

where S: TryToPrimitive<'s, Self, Error: IntoFieldError<S>> + 's,

type Error = <S as TryToPrimitive<'s, i32>>::Error

fn from_scalar_value(v: &'s S) -> Result<Self, Self::Error>

impl<'s, S> FromScalarValue<'s, S> for &'s S

type Error = Infallible

fn from_scalar_value(v: &'s S) -> Result<Self, Self::Error>

impl<'s, S> FromScalarValue<'s, S> for String

where S: TryToPrimitive<'s, Self, Error: IntoFieldError<S>> + 's,

type Error = <S as TryToPrimitive<'s, String>>::Error

fn from_scalar_value(v: &'s S) -> Result<Self, Self::Error>

impl<'s, T, S> FromScalarValue<'s, S> for Box<T>

where S: ScalarValue, T: FromScalarValue<'s, S> + 's,

type Error = <T as FromScalarValue<'s, S>>::Error

fn from_scalar_value(v: &'s S) -> Result<Self, Self::Error>

impl<'s, T, S> FromScalarValue<'s, S> for Arc<T>

where S: ScalarValue, T: FromScalarValue<'s, S> + 's,

type Error = <T as FromScalarValue<'s, S>>::Error

fn from_scalar_value(v: &'s S) -> Result<Self, Self::Error>

Implementors

impl<'___a, __S> FromScalarValue<'___a, __S> for juniper::integrations::jiff::TimeZone

where __S: ScalarValue, Self: '___a,

Available on crate feature jiff only.

type Error = FieldError<__S>

impl<'___a, __S> FromScalarValue<'___a, __S> for ArcStr

where __S: ScalarValue, Self: '___a,

type Error = FieldError<__S>

impl<'___a, __S> FromScalarValue<'___a, __S> for ID

where __S: ScalarValue, Self: '___a,

type Error = FieldError<__S>

impl<'s, S: ScalarValue> FromScalarValue<'s, S> for &'s Scalar<S>

type Error = Infallible