Struct qualia::MutableCollection

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

A reference to a modifiable set of objects matching a given query, as returned by Checkpoint::query().

All methods of Collection are available for MutableCollection.

Implementations

impl<'a> MutableCollection<'a>

pub fn delete(&self) -> Result<usize>

Delete all objects in the collection.

Returns the number of deleted objects.

pub fn set(&self, fields: Object) -> Result<usize>

Set the given fields on objects in the collection.

Returns the number of updated objects.

Methods from Deref<Target = Collection<'a>>

pub fn len(&self) -> Result<usize>

Get the number of objects in the collection.

pub fn exists(&self) -> Result<bool>

Returns true if there are any objects in the collection.

pub fn iter(&self) -> Result<impl Iterator<Item = Object> + 'a>

Iterate over all objects in the collection.

This prefetches all objects in the collection so that errors can be reported early.

pub fn one(&self) -> Result<Object>

Get one and only one object from the collection.

Will error if more than one object is returned.

pub fn iter_as<T: ObjectShapePlain + 'a>( &self ) -> Result<impl Iterator<Item = T> + 'a>

Iterate over all objects in the collection, converting them to the given shape.

This prefetches all objects in the collection so that errors can be reported early.

pub fn one_as<T: ObjectShapePlain + 'a>(&self) -> Result<T>

Get one and only one object from the collection, converting it to the given shape.

Will error if more than one object is returned.

pub fn iter_converted<T: ObjectShape + 'a>( &self, store: &Store ) -> Result<impl Iterator<Item = T> + 'a>

Iterate over all objects in the collection, converting them to the given shape.

This prefetches all objects in the collection so that errors can be reported early.

pub fn one_converted<T: ObjectShape + 'a>(&self, store: &Store) -> Result<T>

Get one and only one object from the collection, converting it to the given shape.

Will error if more than one object is returned.

Trait Implementations

impl<'a> Deref for MutableCollection<'a>

type Target = Collection<'a>

The resulting type after dereferencing.

fn deref(&self) -> &Collection<'a>

Dereferences the value.