[−][src]Enum juniper::meta::MetaType
Generic type metadata
Implementations
impl<'a, S> MetaType<'a, S>
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pub fn name(&self) -> Option<&str>
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Access the name of the type, if applicable
Lists, non-null wrappers, and placeholders don't have names.
pub fn description(&self) -> Option<&String>
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Access the description of the type, if applicable
Lists, nullable wrappers, and placeholders don't have names.
pub fn type_kind(&self) -> TypeKind
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Construct a TypeKind
for a given type
Panics
Panics if the type represents a placeholder or nullable type.
pub fn field_by_name(&self, name: &str) -> Option<&Field<'_, S>>
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Access a field's meta data given its name
Only objects and interfaces have fields. This method always returns None
for other types.
pub fn input_field_by_name(&self, name: &str) -> Option<&Argument<'_, S>>
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Access an input field's meta data given its name
Only input objects have input fields. This method always returns None
for other types.
pub fn as_type(&self) -> Type<'a>
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Construct a Type
literal instance based on the metadata
pub fn input_value_parse_fn(&self) -> Option<fn'b(_: &'b InputValue<S>) -> bool>
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Access the input value parse function, if applicable
An input value parse function is a function that takes an InputValue
instance and returns
true
if it can be parsed as the provided type.
Only scalars, enums, and input objects have parse functions.
pub fn is_composite(&self) -> bool
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Returns true if the type is a composite type
Objects, interfaces, and unions are composite.
pub fn is_leaf(&self) -> bool
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Returns true if the type can occur in leaf positions in queries
Only enums and scalars are leaf types.
pub fn is_abstract(&self) -> bool
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Returns true if the type is abstract
Only interfaces and unions are abstract types.
pub fn is_input(&self) -> bool
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Returns true if the type can be used in input positions, e.g. arguments or variables
Only scalars, enums, and input objects are input types.
pub fn is_builtin(&self) -> bool
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Returns true if the type is built-in to GraphQL.
Trait Implementations
Auto Trait Implementations
impl<'a, S> RefUnwindSafe for MetaType<'a, S> where
S: RefUnwindSafe,
S: RefUnwindSafe,
impl<'a, S> Send for MetaType<'a, S> where
S: Send,
S: Send,
impl<'a, S> Sync for MetaType<'a, S> where
S: Sync,
S: Sync,
impl<'a, S> Unpin for MetaType<'a, S> where
S: Unpin,
S: Unpin,
impl<'a, S> UnwindSafe for MetaType<'a, 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<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>,