[][src]Struct juniper::FieldError

pub struct FieldError<S = DefaultScalarValue> { /* fields omitted */ }

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)?;


impl<S> FieldError<S>[src]

pub fn new<T: Display>(e: T, extensions: Value<S>) -> FieldError<S>[src]

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;

    "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.

Trait Implementations

impl<S: Debug> Debug for FieldError<S>[src]

impl<T: Display, S> From<T> for FieldError<S> where
    S: ScalarValue

impl<S> IntoFieldError<S> for FieldError<S>[src]

impl<S: PartialEq> PartialEq<FieldError<S>> for FieldError<S>[src]

impl<S> StructuralPartialEq for FieldError<S>[src]

Auto Trait Implementations

impl<S> RefUnwindSafe for FieldError<S> where
    S: RefUnwindSafe

impl<S> Send for FieldError<S> where
    S: Send

impl<S> Sync for FieldError<S> where
    S: Sync

impl<S> Unpin for FieldError<S> where
    S: Unpin

impl<S> UnwindSafe for FieldError<S> where
    S: UnwindSafe

Blanket Implementations

impl<T> Any for T where
    T: 'static + ?Sized

impl<T> Borrow<T> for T where
    T: ?Sized

impl<T> BorrowMut<T> for T where
    T: ?Sized

impl<T> From<!> for T[src]

impl<T> From<T> for T[src]

impl<T, U> Into<U> for T where
    U: From<T>, 

impl<T, U> TryFrom<U> for T where
    U: Into<T>, 

type Error = Infallible

The type returned in the event of a conversion error.

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, 

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.