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mod.rs
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pub mod options;
use std::{borrow::Borrow, collections::HashSet, fmt, fmt::Debug, sync::Arc};
use futures_util::{
future,
stream::{StreamExt, TryStreamExt},
};
use serde::{
de::{DeserializeOwned, Error as DeError},
Deserialize,
Deserializer,
Serialize,
};
use self::options::*;
use crate::{
bson::{doc, to_document, Bson, Document},
bson_util,
change_stream::{
event::ChangeStreamEvent,
options::ChangeStreamOptions,
session::SessionChangeStream,
ChangeStream,
},
client::options::ServerAddress,
cmap::conn::PinnedConnectionHandle,
concern::{ReadConcern, WriteConcern},
error::{convert_bulk_errors, BulkWriteError, BulkWriteFailure, Error, ErrorKind, Result},
index::IndexModel,
operation::{
Aggregate,
Count,
CountDocuments,
CreateIndexes,
Delete,
Distinct,
DropCollection,
DropIndexes,
Find,
FindAndModify,
Insert,
ListIndexes,
Update,
},
results::{
CreateIndexResult,
CreateIndexesResult,
DeleteResult,
InsertManyResult,
InsertOneResult,
UpdateResult,
},
selection_criteria::SelectionCriteria,
Client,
ClientSession,
Cursor,
Database,
SessionCursor,
};
/// `Collection` is the client-side abstraction of a MongoDB Collection. It can be used to
/// perform collection-level operations such as CRUD operations. A `Collection` can be obtained
/// through a [`Database`](struct.Database.html) by calling either
/// [`Database::collection`](struct.Database.html#method.collection) or
/// [`Database::collection_with_options`](struct.Database.html#method.collection_with_options).
///
/// A [`Collection`] can be parameterized with any type that implements the
/// `Serialize` and `Deserialize` traits from the [`serde`](https://serde.rs/) crate. This includes but
/// is not limited to just `Document`. The various methods that accept or return instances of the
/// documents in the collection will accept/return instances of the generic parameter (e.g.
/// [`Collection::insert_one`] accepts it as an argument, [`Collection::find_one`] returns an
/// `Option` of it). It is recommended to define types that model your data which you can
/// parameterize your [`Collection`]s with instead of `Document`, since doing so eliminates a lot of
/// boilerplate deserialization code and is often more performant.
///
/// `Collection` uses [`std::sync::Arc`](https://doc.rust-lang.org/std/sync/struct.Arc.html) internally,
/// so it can safely be shared across threads or async tasks.
///
/// # Example
/// ```rust
/// # use mongodb::{
/// # bson::doc,
/// # error::Result,
/// # };
/// # #[cfg(feature = "async-std-runtime")]
/// # use async_std::task;
/// # #[cfg(feature = "tokio-runtime")]
/// # use tokio::task;
/// #
/// # #[cfg(all(not(feature = "sync"), not(feature = "tokio-sync")))]
/// # async fn start_workers() -> Result<()> {
/// # use mongodb::Client;
/// #
/// # let client = Client::with_uri_str("mongodb://example.com").await?;
/// use serde::{Deserialize, Serialize};
///
/// /// Define a type that models our data.
/// #[derive(Clone, Debug, Deserialize, Serialize)]
/// struct Item {
/// id: u32,
/// }
///
/// // Parameterize our collection with the model.
/// let coll = client.database("items").collection::<Item>("in_stock");
///
/// for i in 0..5 {
/// let coll_ref = coll.clone();
///
/// // Spawn several tasks that operate on the same collection concurrently.
/// task::spawn(async move {
/// // Perform operations with `coll_ref` that work with directly our model.
/// coll_ref.insert_one(Item { id: i }, None).await;
/// });
/// }
/// #
/// # Ok(())
/// # }
/// ```
#[derive(Debug)]
pub struct Collection<T> {
inner: Arc<CollectionInner>,
_phantom: std::marker::PhantomData<T>,
}
// Because derive is too conservative, derive only implements Clone if T is Clone.
// Collection<T> does not actually store any value of type T (so T does not need to be clone).
impl<T> Clone for Collection<T> {
fn clone(&self) -> Self {
Self {
inner: self.inner.clone(),
_phantom: Default::default(),
}
}
}
#[derive(Debug)]
struct CollectionInner {
client: Client,
db: Database,
name: String,
selection_criteria: Option<SelectionCriteria>,
read_concern: Option<ReadConcern>,
write_concern: Option<WriteConcern>,
}
impl<T> Collection<T> {
pub(crate) fn new(db: Database, name: &str, options: Option<CollectionOptions>) -> Self {
let options = options.unwrap_or_default();
let selection_criteria = options
.selection_criteria
.or_else(|| db.selection_criteria().cloned());
let read_concern = options.read_concern.or_else(|| db.read_concern().cloned());
let write_concern = options
.write_concern
.or_else(|| db.write_concern().cloned());
Self {
inner: Arc::new(CollectionInner {
client: db.client().clone(),
db,
name: name.to_string(),
selection_criteria,
read_concern,
write_concern,
}),
_phantom: Default::default(),
}
}
/// Gets a clone of the `Collection` with a different type `U`.
pub fn clone_with_type<U>(&self) -> Collection<U> {
Collection {
inner: self.inner.clone(),
_phantom: Default::default(),
}
}
/// Get the `Client` that this collection descended from.
fn client(&self) -> &Client {
&self.inner.client
}
/// Gets the name of the `Collection`.
pub fn name(&self) -> &str {
&self.inner.name
}
/// Gets the namespace of the `Collection`.
///
/// The namespace of a MongoDB collection is the concatenation of the name of the database
/// containing it, the '.' character, and the name of the collection itself. For example, if a
/// collection named "bar" is created in a database named "foo", the namespace of the collection
/// is "foo.bar".
pub fn namespace(&self) -> Namespace {
Namespace {
db: self.inner.db.name().into(),
coll: self.name().into(),
}
}
/// Gets the selection criteria of the `Collection`.
pub fn selection_criteria(&self) -> Option<&SelectionCriteria> {
self.inner.selection_criteria.as_ref()
}
/// Gets the read concern of the `Collection`.
pub fn read_concern(&self) -> Option<&ReadConcern> {
self.inner.read_concern.as_ref()
}
/// Gets the write concern of the `Collection`.
pub fn write_concern(&self) -> Option<&WriteConcern> {
self.inner.write_concern.as_ref()
}
async fn drop_common(
&self,
options: impl Into<Option<DropCollectionOptions>>,
session: impl Into<Option<&mut ClientSession>>,
) -> Result<()> {
let session = session.into();
let mut options = options.into();
resolve_options!(self, options, [write_concern]);
let drop = DropCollection::new(self.namespace(), options);
self.client().execute_operation(drop, session).await
}
/// Drops the collection, deleting all data and indexes stored in it.
pub async fn drop(&self, options: impl Into<Option<DropCollectionOptions>>) -> Result<()> {
self.drop_common(options, None).await
}
/// Drops the collection, deleting all data and indexes stored in it using the provided
/// `ClientSession`.
pub async fn drop_with_session(
&self,
options: impl Into<Option<DropCollectionOptions>>,
session: &mut ClientSession,
) -> Result<()> {
self.drop_common(options, session).await
}
/// Runs an aggregation operation.
///
/// See the documentation [here](https://www.mongodb.com/docs/manual/aggregation/) for more
/// information on aggregations.
pub async fn aggregate(
&self,
pipeline: impl IntoIterator<Item = Document>,
options: impl Into<Option<AggregateOptions>>,
) -> Result<Cursor<Document>> {
let mut options = options.into();
resolve_options!(
self,
options,
[read_concern, write_concern, selection_criteria]
);
let aggregate = Aggregate::new(self.namespace(), pipeline, options);
let client = self.client();
client.execute_cursor_operation(aggregate).await
}
/// Runs an aggregation operation using the provided `ClientSession`.
///
/// See the documentation [here](https://www.mongodb.com/docs/manual/aggregation/) for more
/// information on aggregations.
pub async fn aggregate_with_session(
&self,
pipeline: impl IntoIterator<Item = Document>,
options: impl Into<Option<AggregateOptions>>,
session: &mut ClientSession,
) -> Result<SessionCursor<Document>> {
let mut options = options.into();
resolve_read_concern_with_session!(self, options, Some(&mut *session))?;
resolve_write_concern_with_session!(self, options, Some(&mut *session))?;
resolve_selection_criteria_with_session!(self, options, Some(&mut *session))?;
let aggregate = Aggregate::new(self.namespace(), pipeline, options);
let client = self.client();
client
.execute_session_cursor_operation(aggregate, session)
.await
}
/// Estimates the number of documents in the collection using collection metadata.
///
/// Due to an oversight in versions 5.0.0 - 5.0.7 of MongoDB, the `count` server command,
/// which `estimatedDocumentCount` uses in its implementation, was not included in v1 of the
/// Stable API. Users of the Stable API with `estimatedDocumentCount` are recommended to
/// upgrade their cluster to 5.0.8+ or set
/// [`ServerApi::strict`](crate::options::ServerApi::strict) to false to avoid encountering
/// errors.
///
/// For more information on the behavior of the `count` server command, see
/// [Count: Behavior](https://www.mongodb.com/docs/manual/reference/command/count/#behavior).
pub async fn estimated_document_count(
&self,
options: impl Into<Option<EstimatedDocumentCountOptions>>,
) -> Result<u64> {
let mut options = options.into();
resolve_options!(self, options, [read_concern, selection_criteria]);
let op = Count::new(self.namespace(), options);
self.client().execute_operation(op, None).await
}
async fn count_documents_common(
&self,
filter: impl Into<Option<Document>>,
options: impl Into<Option<CountOptions>>,
session: impl Into<Option<&mut ClientSession>>,
) -> Result<u64> {
let session = session.into();
let mut options = options.into();
resolve_read_concern_with_session!(self, options, session.as_ref())?;
resolve_selection_criteria_with_session!(self, options, session.as_ref())?;
let op = CountDocuments::new(self.namespace(), filter.into(), options)?;
self.client().execute_operation(op, session).await
}
/// Gets the number of documents matching `filter`.
///
/// Note that using [`Collection::estimated_document_count`](#method.estimated_document_count)
/// is recommended instead of this method is most cases.
pub async fn count_documents(
&self,
filter: impl Into<Option<Document>>,
options: impl Into<Option<CountOptions>>,
) -> Result<u64> {
self.count_documents_common(filter, options, None).await
}
/// Gets the number of documents matching `filter` using the provided `ClientSession`.
///
/// Note that using [`Collection::estimated_document_count`](#method.estimated_document_count)
/// is recommended instead of this method is most cases.
pub async fn count_documents_with_session(
&self,
filter: impl Into<Option<Document>>,
options: impl Into<Option<CountOptions>>,
session: &mut ClientSession,
) -> Result<u64> {
self.count_documents_common(filter, options, session).await
}
async fn delete_many_common(
&self,
query: Document,
options: impl Into<Option<DeleteOptions>>,
session: impl Into<Option<&mut ClientSession>>,
) -> Result<DeleteResult> {
let session = session.into();
let mut options = options.into();
resolve_write_concern_with_session!(self, options, session.as_ref())?;
let delete = Delete::new(self.namespace(), query, None, options);
self.client().execute_operation(delete, session).await
}
async fn create_indexes_common(
&self,
indexes: impl IntoIterator<Item = IndexModel>,
options: impl Into<Option<CreateIndexOptions>>,
session: impl Into<Option<&mut ClientSession>>,
) -> Result<CreateIndexesResult> {
let session = session.into();
let mut options = options.into();
resolve_write_concern_with_session!(self, options, session.as_ref())?;
let indexes: Vec<IndexModel> = indexes.into_iter().collect();
let create_indexes = CreateIndexes::new(self.namespace(), indexes, options);
self.client()
.execute_operation(create_indexes, session)
.await
}
async fn create_index_common(
&self,
index: IndexModel,
options: impl Into<Option<CreateIndexOptions>>,
session: impl Into<Option<&mut ClientSession>>,
) -> Result<CreateIndexResult> {
let response = self
.create_indexes_common(vec![index], options, session)
.await?;
Ok(response.into_create_index_result())
}
/// Creates the given index on this collection.
pub async fn create_index(
&self,
index: IndexModel,
options: impl Into<Option<CreateIndexOptions>>,
) -> Result<CreateIndexResult> {
self.create_index_common(index, options, None).await
}
/// Creates the given index on this collection using the provided `ClientSession`.
pub async fn create_index_with_session(
&self,
index: IndexModel,
options: impl Into<Option<CreateIndexOptions>>,
session: &mut ClientSession,
) -> Result<CreateIndexResult> {
self.create_index_common(index, options, session).await
}
/// Creates the given indexes on this collection.
pub async fn create_indexes(
&self,
indexes: impl IntoIterator<Item = IndexModel>,
options: impl Into<Option<CreateIndexOptions>>,
) -> Result<CreateIndexesResult> {
self.create_indexes_common(indexes, options, None).await
}
/// Creates the given indexes on this collection using the provided `ClientSession`.
pub async fn create_indexes_with_session(
&self,
indexes: impl IntoIterator<Item = IndexModel>,
options: impl Into<Option<CreateIndexOptions>>,
session: &mut ClientSession,
) -> Result<CreateIndexesResult> {
self.create_indexes_common(indexes, options, session).await
}
/// Deletes all documents stored in the collection matching `query`.
pub async fn delete_many(
&self,
query: Document,
options: impl Into<Option<DeleteOptions>>,
) -> Result<DeleteResult> {
self.delete_many_common(query, options, None).await
}
/// Deletes all documents stored in the collection matching `query` using the provided
/// `ClientSession`.
pub async fn delete_many_with_session(
&self,
query: Document,
options: impl Into<Option<DeleteOptions>>,
session: &mut ClientSession,
) -> Result<DeleteResult> {
self.delete_many_common(query, options, session).await
}
async fn delete_one_common(
&self,
query: Document,
options: impl Into<Option<DeleteOptions>>,
session: impl Into<Option<&mut ClientSession>>,
) -> Result<DeleteResult> {
let session = session.into();
let mut options = options.into();
resolve_write_concern_with_session!(self, options, session.as_ref())?;
let delete = Delete::new(self.namespace(), query, Some(1), options);
self.client().execute_operation(delete, session).await
}
/// Deletes up to one document found matching `query`.
///
/// This operation will retry once upon failure if the connection and encountered error support
/// retryability. See the documentation
/// [here](https://www.mongodb.com/docs/manual/core/retryable-writes/) for more information on
/// retryable writes.
pub async fn delete_one(
&self,
query: Document,
options: impl Into<Option<DeleteOptions>>,
) -> Result<DeleteResult> {
self.delete_one_common(query, options, None).await
}
/// Deletes up to one document found matching `query` using the provided `ClientSession`.
///
/// This operation will retry once upon failure if the connection and encountered error support
/// retryability. See the documentation
/// [here](https://www.mongodb.com/docs/manual/core/retryable-writes/) for more information on
/// retryable writes.
pub async fn delete_one_with_session(
&self,
query: Document,
options: impl Into<Option<DeleteOptions>>,
session: &mut ClientSession,
) -> Result<DeleteResult> {
self.delete_one_common(query, options, session).await
}
async fn distinct_common(
&self,
field_name: impl AsRef<str>,
filter: impl Into<Option<Document>>,
options: impl Into<Option<DistinctOptions>>,
session: impl Into<Option<&mut ClientSession>>,
) -> Result<Vec<Bson>> {
let session = session.into();
let mut options = options.into();
resolve_read_concern_with_session!(self, options, session.as_ref())?;
resolve_selection_criteria_with_session!(self, options, session.as_ref())?;
let op = Distinct::new(
self.namespace(),
field_name.as_ref().to_string(),
filter.into(),
options,
);
self.client().execute_operation(op, session).await
}
/// Finds the distinct values of the field specified by `field_name` across the collection.
pub async fn distinct(
&self,
field_name: impl AsRef<str>,
filter: impl Into<Option<Document>>,
options: impl Into<Option<DistinctOptions>>,
) -> Result<Vec<Bson>> {
self.distinct_common(field_name, filter, options, None)
.await
}
/// Finds the distinct values of the field specified by `field_name` across the collection using
/// the provided `ClientSession`.
pub async fn distinct_with_session(
&self,
field_name: impl AsRef<str>,
filter: impl Into<Option<Document>>,
options: impl Into<Option<DistinctOptions>>,
session: &mut ClientSession,
) -> Result<Vec<Bson>> {
self.distinct_common(field_name, filter, options, session)
.await
}
async fn drop_indexes_common(
&self,
name: impl Into<Option<&str>>,
options: impl Into<Option<DropIndexOptions>>,
session: impl Into<Option<&mut ClientSession>>,
) -> Result<()> {
let session = session.into();
let mut options = options.into();
resolve_write_concern_with_session!(self, options, session.as_ref())?;
// If there is no provided name, that means we should drop all indexes.
let index_name = name.into().unwrap_or("*").to_string();
let drop_index = DropIndexes::new(self.namespace(), index_name, options);
self.client().execute_operation(drop_index, session).await
}
async fn drop_index_common(
&self,
name: impl AsRef<str>,
options: impl Into<Option<DropIndexOptions>>,
session: impl Into<Option<&mut ClientSession>>,
) -> Result<()> {
let name = name.as_ref();
if name == "*" {
return Err(ErrorKind::InvalidArgument {
message: "Cannot pass name \"*\" to drop_index since more than one index would be \
dropped."
.to_string(),
}
.into());
}
self.drop_indexes_common(name, options, session).await
}
/// Drops the index specified by `name` from this collection.
pub async fn drop_index(
&self,
name: impl AsRef<str>,
options: impl Into<Option<DropIndexOptions>>,
) -> Result<()> {
self.drop_index_common(name, options, None).await
}
/// Drops the index specified by `name` from this collection using the provided `ClientSession`.
pub async fn drop_index_with_session(
&self,
name: impl AsRef<str>,
options: impl Into<Option<DropIndexOptions>>,
session: &mut ClientSession,
) -> Result<()> {
self.drop_index_common(name, options, session).await
}
/// Drops all indexes associated with this collection.
pub async fn drop_indexes(&self, options: impl Into<Option<DropIndexOptions>>) -> Result<()> {
self.drop_indexes_common(None, options, None).await
}
/// Drops all indexes associated with this collection using the provided `ClientSession`.
pub async fn drop_indexes_with_session(
&self,
options: impl Into<Option<DropIndexOptions>>,
session: &mut ClientSession,
) -> Result<()> {
self.drop_indexes_common(None, options, session).await
}
/// Lists all indexes on this collection.
pub async fn list_indexes(
&self,
options: impl Into<Option<ListIndexesOptions>>,
) -> Result<Cursor<IndexModel>> {
let list_indexes = ListIndexes::new(self.namespace(), options.into());
let client = self.client();
client.execute_cursor_operation(list_indexes).await
}
/// Lists all indexes on this collection using the provided `ClientSession`.
pub async fn list_indexes_with_session(
&self,
options: impl Into<Option<ListIndexesOptions>>,
session: &mut ClientSession,
) -> Result<SessionCursor<IndexModel>> {
let list_indexes = ListIndexes::new(self.namespace(), options.into());
let client = self.client();
client
.execute_session_cursor_operation(list_indexes, session)
.await
}
async fn list_index_names_common(
&self,
cursor: impl TryStreamExt<Ok = IndexModel, Error = Error>,
) -> Result<Vec<String>> {
cursor
.try_filter_map(|index| future::ok(index.get_name()))
.try_collect()
.await
}
/// Gets the names of all indexes on the collection.
pub async fn list_index_names(&self) -> Result<Vec<String>> {
let cursor = self.list_indexes(None).await?;
self.list_index_names_common(cursor).await
}
/// Gets the names of all indexes on the collection using the provided `ClientSession`.
pub async fn list_index_names_with_session(
&self,
session: &mut ClientSession,
) -> Result<Vec<String>> {
let mut cursor = self.list_indexes_with_session(None, session).await?;
self.list_index_names_common(cursor.stream(session)).await
}
async fn update_many_common(
&self,
query: Document,
update: impl Into<UpdateModifications>,
options: impl Into<Option<UpdateOptions>>,
session: impl Into<Option<&mut ClientSession>>,
) -> Result<UpdateResult> {
let update = update.into();
if let UpdateModifications::Document(ref d) = update {
bson_util::update_document_check(d)?;
}
let session = session.into();
let mut options = options.into();
resolve_write_concern_with_session!(self, options, session.as_ref())?;
let update = Update::new(self.namespace(), query, update, true, options);
self.client().execute_operation(update, session).await
}
/// Updates all documents matching `query` in the collection.
///
/// Both `Document` and `Vec<Document>` implement `Into<UpdateModifications>`, so either can be
/// passed in place of constructing the enum case. Note: pipeline updates are only supported
/// in MongoDB 4.2+. See the official MongoDB
/// [documentation](https://www.mongodb.com/docs/manual/reference/command/update/#behavior) for more information on specifying updates.
pub async fn update_many(
&self,
query: Document,
update: impl Into<UpdateModifications>,
options: impl Into<Option<UpdateOptions>>,
) -> Result<UpdateResult> {
self.update_many_common(query, update, options, None).await
}
/// Updates all documents matching `query` in the collection using the provided `ClientSession`.
///
/// Both `Document` and `Vec<Document>` implement `Into<UpdateModifications>`, so either can be
/// passed in place of constructing the enum case. Note: pipeline updates are only supported
/// in MongoDB 4.2+. See the official MongoDB
/// [documentation](https://www.mongodb.com/docs/manual/reference/command/update/#behavior) for more information on specifying updates.
pub async fn update_many_with_session(
&self,
query: Document,
update: impl Into<UpdateModifications>,
options: impl Into<Option<UpdateOptions>>,
session: &mut ClientSession,
) -> Result<UpdateResult> {
self.update_many_common(query, update, options, session)
.await
}
async fn update_one_common(
&self,
query: Document,
update: impl Into<UpdateModifications>,
options: impl Into<Option<UpdateOptions>>,
session: impl Into<Option<&mut ClientSession>>,
) -> Result<UpdateResult> {
let update = update.into();
if let UpdateModifications::Document(ref d) = update {
bson_util::update_document_check(d)?;
}
let session = session.into();
let mut options = options.into();
resolve_write_concern_with_session!(self, options, session.as_ref())?;
let update = Update::new(self.namespace(), query, update, false, options);
self.client().execute_operation(update, session).await
}
/// Updates up to one document matching `query` in the collection.
///
/// Both `Document` and `Vec<Document>` implement `Into<UpdateModifications>`, so either can be
/// passed in place of constructing the enum case. Note: pipeline updates are only supported
/// in MongoDB 4.2+. See the official MongoDB
/// [documentation](https://www.mongodb.com/docs/manual/reference/command/update/#behavior) for more information on specifying updates.
///
/// This operation will retry once upon failure if the connection and encountered error support
/// retryability. See the documentation
/// [here](https://www.mongodb.com/docs/manual/core/retryable-writes/) for more information on
/// retryable writes.
pub async fn update_one(
&self,
query: Document,
update: impl Into<UpdateModifications>,
options: impl Into<Option<UpdateOptions>>,
) -> Result<UpdateResult> {
self.update_one_common(query, update, options, None).await
}
/// Updates up to one document matching `query` in the collection using the provided
/// `ClientSession`.
///
/// Both `Document` and `Vec<Document>` implement `Into<UpdateModifications>`, so either can be
/// passed in place of constructing the enum case. Note: pipeline updates are only supported
/// in MongoDB 4.2+. See the official MongoDB
/// [documentation](https://www.mongodb.com/docs/manual/reference/command/update/#behavior) for more information on specifying updates.
///
/// This operation will retry once upon failure if the connection and encountered error support
/// retryability. See the documentation
/// [here](https://www.mongodb.com/docs/manual/core/retryable-writes/) for more information on
/// retryable writes.
pub async fn update_one_with_session(
&self,
query: Document,
update: impl Into<UpdateModifications>,
options: impl Into<Option<UpdateOptions>>,
session: &mut ClientSession,
) -> Result<UpdateResult> {
self.update_one_common(query, update, options, session)
.await
}
/// Kill the server side cursor that id corresponds to.
pub(super) async fn kill_cursor(
&self,
cursor_id: i64,
pinned_connection: Option<&PinnedConnectionHandle>,
drop_address: Option<ServerAddress>,
) -> Result<()> {
let ns = self.namespace();
self.client()
.database(ns.db.as_str())
.run_command_common(
doc! {
"killCursors": ns.coll.as_str(),
"cursors": [cursor_id]
},
drop_address.map(SelectionCriteria::from_address),
None,
pinned_connection,
)
.await?;
Ok(())
}
/// Starts a new [`ChangeStream`](change_stream/struct.ChangeStream.html) that receives events
/// for all changes in this collection. A
/// [`ChangeStream`](change_stream/struct.ChangeStream.html) cannot be started on system
/// collections.
///
/// See the documentation [here](https://www.mongodb.com/docs/manual/changeStreams/) on change
/// streams.
///
/// Change streams require either a "majority" read concern or no read concern. Anything else
/// will cause a server error.
///
/// Also note that using a `$project` stage to remove any of the `_id`, `operationType` or `ns`
/// fields will cause an error. The driver requires these fields to support resumability. For
/// more information on resumability, see the documentation for
/// [`ChangeStream`](change_stream/struct.ChangeStream.html)
///
/// If the pipeline alters the structure of the returned events, the parsed type will need to be
/// changed via [`ChangeStream::with_type`].
pub async fn watch(
&self,
pipeline: impl IntoIterator<Item = Document>,
options: impl Into<Option<ChangeStreamOptions>>,
) -> Result<ChangeStream<ChangeStreamEvent<T>>>
where
T: DeserializeOwned + Unpin + Send + Sync,
{
let mut options = options.into();
resolve_options!(self, options, [read_concern, selection_criteria]);
let target = self.namespace().into();
self.client()
.execute_watch(pipeline, options, target, None)
.await
}
/// Starts a new [`SessionChangeStream`] that receives events for all changes in this collection
/// using the provided [`ClientSession`]. See [`Client::watch`] for more information.
pub async fn watch_with_session(
&self,
pipeline: impl IntoIterator<Item = Document>,
options: impl Into<Option<ChangeStreamOptions>>,
session: &mut ClientSession,
) -> Result<SessionChangeStream<ChangeStreamEvent<T>>>
where
T: DeserializeOwned + Unpin + Send + Sync,
{
let mut options = options.into();
resolve_read_concern_with_session!(self, options, Some(&mut *session))?;
resolve_selection_criteria_with_session!(self, options, Some(&mut *session))?;
let target = self.namespace().into();
self.client()
.execute_watch_with_session(pipeline, options, target, None, session)
.await
}
/// Finds the documents in the collection matching `filter`.
pub async fn find(
&self,
filter: impl Into<Option<Document>>,
options: impl Into<Option<FindOptions>>,
) -> Result<Cursor<T>> {
let mut options = options.into();
resolve_options!(self, options, [read_concern, selection_criteria]);
let find = Find::new(self.namespace(), filter.into(), options);
let client = self.client();
client.execute_cursor_operation(find).await
}
/// Finds the documents in the collection matching `filter` using the provided `ClientSession`.
pub async fn find_with_session(
&self,
filter: impl Into<Option<Document>>,
options: impl Into<Option<FindOptions>>,
session: &mut ClientSession,
) -> Result<SessionCursor<T>> {
let mut options = options.into();
resolve_read_concern_with_session!(self, options, Some(&mut *session))?;
resolve_selection_criteria_with_session!(self, options, Some(&mut *session))?;
let find = Find::new(self.namespace(), filter.into(), options);
let client = self.client();
client.execute_session_cursor_operation(find, session).await
}
}
impl<T> Collection<T>
where
T: DeserializeOwned + Unpin + Send + Sync,
{
/// Finds a single document in the collection matching `filter`.
pub async fn find_one(
&self,
filter: impl Into<Option<Document>>,
options: impl Into<Option<FindOneOptions>>,
) -> Result<Option<T>> {
let mut options = options.into();
resolve_options!(self, options, [read_concern, selection_criteria]);
let options: FindOptions = options.map(Into::into).unwrap_or_else(Default::default);
let mut cursor = self.find(filter, Some(options)).await?;
cursor.next().await.transpose()
}
/// Finds a single document in the collection matching `filter` using the provided
/// `ClientSession`.
pub async fn find_one_with_session(
&self,
filter: impl Into<Option<Document>>,
options: impl Into<Option<FindOneOptions>>,
session: &mut ClientSession,
) -> Result<Option<T>> {
let mut options = options.into();
resolve_read_concern_with_session!(self, options, Some(&mut *session))?;
resolve_selection_criteria_with_session!(self, options, Some(&mut *session))?;
let options: FindOptions = options.map(Into::into).unwrap_or_else(Default::default);
let mut cursor = self
.find_with_session(filter, Some(options), session)
.await?;
let mut cursor = cursor.stream(session);
cursor.next().await.transpose()
}
}
impl<T> Collection<T>
where
T: DeserializeOwned,
{
async fn find_one_and_delete_common(
&self,
filter: Document,
options: impl Into<Option<FindOneAndDeleteOptions>>,
session: impl Into<Option<&mut ClientSession>>,
) -> Result<Option<T>> {
let session = session.into();
let mut options = options.into();
resolve_write_concern_with_session!(self, options, session.as_ref())?;
let op = FindAndModify::<T>::with_delete(self.namespace(), filter, options);
self.client().execute_operation(op, session).await
}
/// Atomically finds up to one document in the collection matching `filter` and deletes it.
///
/// This operation will retry once upon failure if the connection and encountered error support
/// retryability. See the documentation
/// [here](https://www.mongodb.com/docs/manual/core/retryable-writes/) for more information on
/// retryable writes.
pub async fn find_one_and_delete(
&self,
filter: Document,
options: impl Into<Option<FindOneAndDeleteOptions>>,
) -> Result<Option<T>> {
self.find_one_and_delete_common(filter, options, None).await
}
/// Atomically finds up to one document in the collection matching `filter` and deletes it using
/// the provided `ClientSession`.
///
/// This operation will retry once upon failure if the connection and encountered error support
/// retryability. See the documentation
/// [here](https://www.mongodb.com/docs/manual/core/retryable-writes/) for more information on
/// retryable writes.
pub async fn find_one_and_delete_with_session(
&self,
filter: Document,
options: impl Into<Option<FindOneAndDeleteOptions>>,
session: &mut ClientSession,
) -> Result<Option<T>> {
self.find_one_and_delete_common(filter, options, session)
.await
}
async fn find_one_and_update_common(
&self,
filter: Document,
update: impl Into<UpdateModifications>,
options: impl Into<Option<FindOneAndUpdateOptions>>,
session: impl Into<Option<&mut ClientSession>>,
) -> Result<Option<T>> {
let update = update.into();
let session = session.into();
let mut options = options.into();
resolve_write_concern_with_session!(self, options, session.as_ref())?;
let op = FindAndModify::<T>::with_update(self.namespace(), filter, update, options)?;
self.client().execute_operation(op, session).await