Struct ergol::relation::ManyToOne

pub struct ManyToOne<T: ToTable> { /* fields omitted */ }

A many to one relation ship.

You should not use this type by yourself, it should be automatically generated by the #[many_to_one] macro attribute.

Implementations

impl<T: ToTable> ManyToOne<T>

pub fn new(id: i32) -> ManyToOne<T>

Creates a new many to one relationship.

pub async fn fetch<'_, '_>(&'_ self, client: &'_ Client) -> Result<T, Error>

Fetches the element referenced by this relationship.

Trait Implementations

impl<T: Clone + ToTable> Clone for ManyToOne<T>

pub fn clone(&self) -> ManyToOne<T>

Returns a copy of the value.

pub fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<T: Copy + ToTable> Copy for ManyToOne<T>

impl<T: Debug + ToTable> Debug for ManyToOne<T>

pub fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<T: ToTable, '_> From<&'_ T> for ManyToOne<T>

pub fn from(t: &T) -> ManyToOne<T>

Performs the conversion.

impl<T: ToTable> From<T> for ManyToOne<T>

pub fn from(t: T) -> ManyToOne<T>

Performs the conversion.

impl<'a, T: ToTable> FromSql<'a> for ManyToOne<T>

pub fn from_sql(
    ty: &Type,
    raw: &'a [u8]
) -> Result<Self, Box<dyn Error + Sync + Send + 'static>>

Creates a new value of this type from a buffer of data of the specified Postgres Type in its binary format.

pub fn accepts(ty: &Type) -> bool

Determines if a value of this type can be created from the specified Postgres Type.

pub fn from_sql_null(
    ty: &Type
) -> Result<Self, Box<dyn Error + 'static + Send + Sync, Global>>

Creates a new value of this type from a NULL SQL value.

pub fn from_sql_nullable(
    ty: &Type,
    raw: Option<&'a [u8]>
) -> Result<Self, Box<dyn Error + 'static + Send + Sync, Global>>

A convenience function that delegates to from_sql and from_sql_null depending on the value of raw.

impl<T: ToTable> Pg for ManyToOne<T>

pub fn ty() -> String

Returns the potgres type corresponding to the type.

impl<T: ToTable, U: ToTable> Relation<U> for ManyToOne<T>

type Target = T

The type to which your struct will be linked.

type Reverse = Vec<U>

The type to which the linked struct will be linked.

pub fn from_rows(rows: Vec<Row>) -> Self::Reverse

Convert rows into the reverse type.

impl<T: ToTable> ToSql for ManyToOne<T>

pub fn to_sql(
    &self,
    ty: &Type,
    out: &mut BytesMut
) -> Result<IsNull, Box<dyn Error + Sync + Send + 'static>>

Converts the value of self into the binary format of the specified Postgres Type, appending it to out.

pub fn accepts(ty: &Type) -> bool

Determines if a value of this type can be converted to the specified Postgres Type.

pub fn to_sql_checked(
    &self,
    ty: &Type,
    out: &mut BytesMut
) -> Result<IsNull, Box<dyn Error + Sync + Send>>

An adaptor method used internally by Rust-Postgres.