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BaseFilter

post_archiver::query

Trait BaseFilter 

Source 
pub trait BaseFilter: Sized {
    type Based: AsTable;

    // Required methods
    fn update_sql<T: FromQuery<Based = Self::Based>>(
        &self,
        sql: RawSql<T>,
    ) -> RawSql<T>;
    fn queryer(&self) -> &Queryer<'_, impl PostArchiverConnection>;

    // Provided method
    fn count(&self) -> Result<u64> { ... }
}
Available on crate feature utils only.
Expand description

Trait for types that hold filter conditions and can write them into a RawSql.

Query builders (e.g. PostQuery) and decorator wrappers (e.g. Paginated) implement this trait so that BaseFilter::count() can compute the total matching row count. The default count() implementation caches its result to avoid redundant queries.

Required Associated Types§

Source

type Based: AsTable

Required Methods§

Source

fn update_sql<T: FromQuery<Based = Self::Based>>( &self, sql: RawSql<T>, ) -> RawSql<T>

Append all filter conditions held by this builder into sql and return the updated RawSql.

Source

fn queryer(&self) -> &Queryer<'_, impl PostArchiverConnection>

Return a reference to the Queryer owned by this builder, used by the default count() impl.

Provided Methods§

Source

fn count(&self) -> Result<u64>

Dyn Compatibility§

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors§