Struct SchemaReference

pub struct SchemaReference<'a> { /* private fields */ }

Schema Reference

A stateful traverser that may be used to traverse a schema as a query is traversed. It supports diving into types by specifying fields and fragment conditions. As a query is traversed it keeps a stack of previous types, hence, as fields and fragments are traversed it can keep track of the current type that a selection set is operating on.

Implementations

impl<'a> SchemaReference<'a>

pub fn from_object_type( schema: &'a Schema<'_>, object: &'a SchemaObject<'a>, ) -> Self

Create a schema reference pointer from a given SchemaObject type to start from.

pub fn from_fragment( schema: &'a Schema<'a>, type_condition: &'a str, ) -> Result<Self>

Create a schema reference pointer from a schema and selected fragment type-condition

pub fn from_schema( schema: &'a Schema<'a>, operation_kind: OperationKind, ) -> Result<Self>

Create a schema reference pointer from a schema and selected root operation kind.

pub fn leave_type(&mut self) -> Result<OutputType<'a>>

Leave the current type and return to the previously pointed at output type.

pub fn output_type(&self) -> OutputType<'a>

Returns the current pointer’s referenced OutputType.

pub fn get_field(&self, field_name: &'a str) -> Option<&SchemaField<'a>>

Returns a field, if possible, on the current OutputType.

pub fn select_field(&mut self, field_name: &'a str) -> Result<OutputType<'a>>

Traverse deeper by selecting a field on the current OutputType and return the next OutputType.

pub fn select_condition(&mut self, type_name: &'a str) -> Result<OutputType<'a>>

Traverse deeper by applying a fragment condition on the current OutputType and return the next OutputType.

Trait Implementations

impl<'a> Clone for SchemaReference<'a>

fn clone(&self) -> SchemaReference<'a>

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.