[−][src]Struct juniper::FieldError
Error type for errors that occur during field resolution
Field errors are represented by a human-readable error message and an
optional Value
structure containing additional information.
They can be converted to from any type that implements std::fmt::Display
,
which makes error chaining with the ?
operator a breeze:
fn get_string(data: Vec<u8>) -> Result<String, FieldError> { let s = String::from_utf8(data)?; Ok(s) }
Implementations
impl<S> FieldError<S>
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pub fn new<T: Display>(e: T, extensions: Value<S>) -> FieldError<S>
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Construct a new error with additional data
You can use the graphql_value!
macro to construct an error:
use juniper::FieldError; use juniper::graphql_value; FieldError::new( "Could not open connection to the database", graphql_value!({ "internal_error": "Connection refused" }) );
The extensions
parameter will be added to the "extensions"
field of the error
object in the JSON response:
{
"errors": [
"message": "Could not open connection to the database",
"locations": [{"line": 2, "column": 4}],
"extensions": {
"internal_error": "Connection refused"
}
]
}
If the argument is Value::null()
, no extra data will be included.
pub fn map_scalar_value<Into>(self) -> FieldError<Into> where
S: ScalarValue,
Into: ScalarValue,
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S: ScalarValue,
Into: ScalarValue,
Maps the ScalarValue
type of this FieldError
into the specified one.
Trait Implementations
impl<S: Debug> Debug for FieldError<S>
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impl<T: Display, S> From<T> for FieldError<S> where
S: ScalarValue,
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S: ScalarValue,
pub fn from(e: T) -> FieldError<S>
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impl<S1: ScalarValue, S2: ScalarValue> IntoFieldError<S2> for FieldError<S1>
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pub fn into_field_error(self) -> FieldError<S2>
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impl<S: PartialEq> PartialEq<FieldError<S>> for FieldError<S>
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pub fn eq(&self, other: &FieldError<S>) -> bool
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pub fn ne(&self, other: &FieldError<S>) -> bool
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impl<S> StructuralPartialEq for FieldError<S>
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Auto Trait Implementations
impl<S> RefUnwindSafe for FieldError<S> where
S: RefUnwindSafe,
S: RefUnwindSafe,
impl<S> Send for FieldError<S> where
S: Send,
S: Send,
impl<S> Sync for FieldError<S> where
S: Sync,
S: Sync,
impl<S> Unpin for FieldError<S> where
S: Unpin,
S: Unpin,
impl<S> UnwindSafe for FieldError<S> where
S: UnwindSafe,
S: UnwindSafe,
Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
pub fn borrow_mut(&mut self) -> &mut T
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impl<T> From<!> for T
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impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.
pub fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
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impl<V, T> VZip<V> for T where
V: MultiLane<T>,
V: MultiLane<T>,