pub struct Updates<U: Update> {
pub set: Option<U>,
pub unset: Option<U>,
}
Expand description
Used for complex updates using MongoDB’s update operators.
§NOTE
Not all operators are implemented yet…
§Examples
Unset the age of a user.
use mongod::bson::Document;
use mongod::{AsFilter, AsUpdate, Comparator, Error, Update, Updates};
use serde::{Deserialize, Serialize};
#[derive(Bson, Mongo, Deserialize, Serialize)]
#[mongo(collection="users", field, filter)]
pub struct User {
pub name: String,
pub age: u32,
}
#[derive(Default)]
pub struct UserUpdate {
pub name: Option<String>,
pub age: Option<u32>,
}
impl Update for UserUpdate {
fn new() -> Self {
UserUpdate::default()
}
fn into_document(self) -> Result<Document, Error> {
let mut doc = Document::new();
if let Some(value) = self.name {
doc.insert("name", value);
}
if let Some(value) = self.age {
doc.insert("age", value);
}
Ok(doc)
}
}
impl AsUpdate<UserUpdate> for User {
fn update() -> UserUpdate {
UserUpdate::default()
}
fn into_update(self) -> UserUpdate {
UserUpdate {
name: Some(self.name),
age: Some(self.age),
}
}
}
let client = mongod::Client::default();
let mut filter = User::filter();
filter.name = Some(Comparator::Eq("foo".to_owned()));
// NOTE: Unsetting a field that is not optional or doesn't have a default will cause
// deserialisation from the database to fail.
let unset = UserUpdate {
age: None,
..UserUpdate::default()
};
let updates = Updates {
unset: Some(unset),
..Updates::default()
};
let _cursor = client.update::<User, _, _>(filter, updates).await.unwrap();
Fields§
§set: Option<U>
Sets the value of a field in a document.
unset: Option<U>
Removes the specified field from a document.
Implementations§
Trait Implementations§
Auto Trait Implementations§
impl<U> Freeze for Updates<U>where
U: Freeze,
impl<U> RefUnwindSafe for Updates<U>where
U: RefUnwindSafe,
impl<U> Send for Updates<U>where
U: Send,
impl<U> Sync for Updates<U>where
U: Sync,
impl<U> Unpin for Updates<U>where
U: Unpin,
impl<U> UnwindSafe for Updates<U>where
U: UnwindSafe,
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