Trait aragog::Link

pub trait Link<T: Record>: Sized {
    fn link_query(&self) -> Query;

#[must_use]    fn linked_models<'life0, 'life1, 'async_trait, D>(
        &'life0 self, 
        db_pool: &'life1 D
    ) -> Pin<Box<dyn Future<Output = Result<RecordQueryResult<T>, ServiceError>> + Send + 'async_trait>>
    where
        Self: Sized,
        D: DatabaseAccess,
        T: 'async_trait,
        D: 'async_trait,
        'life0: 'async_trait,
        'life1: 'async_trait,
        Self: Sync + 'async_trait,
    { ... }
}

The Link trait of the Aragog library. It allows to define a query relation between different models.

Example

#[derive(Clone, Serialize, Deserialize, Record, Validate)]
pub struct Order {
    pub content: String,
    pub user_id: String,
}

#[derive(Clone, Serialize, Deserialize, Record, Validate)]
pub struct User {}

impl Link<Order> for DatabaseRecord<User> {
    fn link_query(&self) -> Query {
        Order::query().filter(Comparison::field("user_id").equals_str(self.key()).into())
    }
}

let user = DatabaseRecord::create(User {}, &database_pool).await.unwrap();
let order = DatabaseRecord::create(
    Order {
        content: "content".to_string(),
        user_id: user.key().clone()
    },
    &database_pool).await.unwrap();
let orders = user.linked_models(&database_pool).await.unwrap();
assert_eq!(user.key(), &orders.first().unwrap().user_id);

Required methods

fn link_query(&self) -> Query

Defines the query to execute to find the T models linked to Self

Example

#[derive(Clone, Serialize, Deserialize, Record, Validate)]
pub struct Order {
    pub content: String,
    pub user_id: String,
}

#[derive(Clone, Serialize, Deserialize, Record, Validate)]
pub struct User {}

impl Link<Order> for DatabaseRecord<User> {
    fn link_query(&self) -> Query {
        Order::query().filter(Comparison::field("user_id").equals_str(self.key()).into())
    }
}

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Provided methods

#[must_use]fn linked_models<'life0, 'life1, 'async_trait, D>(
    &'life0 self,
    db_pool: &'life1 D
) -> Pin<Box<dyn Future<Output = Result<RecordQueryResult<T>, ServiceError>> + Send + 'async_trait>> where
    Self: Sized,
    D: DatabaseAccess,
    T: 'async_trait,
    D: 'async_trait,
    'life0: 'async_trait,
    'life1: 'async_trait,
    Self: Sync + 'async_trait, 

Retrieves the records matching the defined link_query. Type inference may be required.

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Implementors

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