[−][src]Struct butane_core::fkey::ForeignKey
Used to implement a relationship between models.
Initialize using From
or from_pk
Examples
ⓘ
#[model] struct Blog { ... } #[model] struct Post { blog: ForeignKey<Blog>, ... }
Implementations
impl<T: DataObject> ForeignKey<T>
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pub fn from_pk(pk: T::PKType) -> Self
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pub fn get(&self) -> Result<&T>
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Returns a reference to the value. It must have already been loaded. If not, returns Error::ValueNotLoaded
pub fn pk(&self) -> T::PKType
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Returns a reference to the primary key of the value.
pub fn load(&self, conn: &impl ConnectionMethods) -> Result<&T>
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Loads the value referred to by this foreign key from the database if necessary and returns a reference to it.
Trait Implementations
impl<T> AsPrimaryKey<T> for ForeignKey<T> where
T: DataObject,
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T: DataObject,
impl<T: DataObject> Clone for ForeignKey<T>
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pub fn clone(&self) -> Self
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pub fn clone_from(&mut self, source: &Self)
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impl<T: DataObject> Debug for ForeignKey<T>
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impl<'de, T> Deserialize<'de> for ForeignKey<T> where
T: DataObject,
T::PKType: Deserialize<'de>,
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T: DataObject,
T::PKType: Deserialize<'de>,
pub fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> where
D: Deserializer<'de>,
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D: Deserializer<'de>,
impl<T: DataObject> Eq for ForeignKey<T>
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impl<T> FieldType for ForeignKey<T> where
T: DataObject,
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T: DataObject,
pub const SQLTYPE: SqlType
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type RefType = <<T as DataObject>::PKType as FieldType>::RefType
Reference type. Used for ergonomics with String (which has reference type str). For most, it is Self Read more
impl<T: DataObject> From<&'_ T> for ForeignKey<T>
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impl<T: DataObject> From<T> for ForeignKey<T>
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impl<T> FromSql for ForeignKey<T> where
T: DataObject,
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T: DataObject,
impl<T> IntoSql for ForeignKey<T> where
T: DataObject,
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T: DataObject,
impl<T, U> PartialEq<U> for ForeignKey<T> where
U: AsPrimaryKey<T>,
T: DataObject,
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U: AsPrimaryKey<T>,
T: DataObject,
impl<T> Serialize for ForeignKey<T> where
T: DataObject,
T::PKType: Serialize,
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T: DataObject,
T::PKType: Serialize,
impl<T> ToSql for ForeignKey<T> where
T: DataObject,
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T: DataObject,
Auto Trait Implementations
impl<T> !RefUnwindSafe for ForeignKey<T>
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impl<T> Send for ForeignKey<T> where
T: Send,
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T: Send,
impl<T> !Sync for ForeignKey<T>
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impl<T> Unpin for ForeignKey<T> where
T: Unpin,
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T: Unpin,
impl<T> UnwindSafe for ForeignKey<T> where
T: UnwindSafe,
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T: UnwindSafe,
Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
pub fn borrow_mut(&mut self) -> &mut T
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impl<T> DeserializeOwned for T where
T: for<'de> Deserialize<'de>,
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T: for<'de> Deserialize<'de>,
impl<T> From<!> for T
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impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T> ToOwned for T where
T: Clone,
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T: Clone,
type Owned = T
The resulting type after obtaining ownership.
pub fn to_owned(&self) -> T
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pub fn clone_into(&self, target: &mut T)
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impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,