Enum Relation

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pub enum Relation {
    BelongsTo(BelongsTo),
    HasMany(HasMany),
    HasOne(HasOne),
    BelongsToMany(BelongsToMany),
    MorphMany(MorphMany),
    MorphTo(MorphTo),
}

Expand description

模型间的关系描述

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BelongsTo(BelongsTo)

多对一关系（如 Order 属于 User）

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HasMany(HasMany)

一对多关系（如 User 有多个 Order）

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HasOne(HasOne)

一对一关系（如 User 有一个 Profile）

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BelongsToMany(BelongsToMany)

多对多关系（通过中间表，如 User 与 Role）

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MorphMany(MorphMany)

多态一对多（如 Comment 可关联 Post / Video / Image 等多种父模型）子表通过 morph_type_column + morph_id_column 反向定位父模型

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MorphTo(MorphTo)

多态反向：当前模型可被多种父模型拥有（当前模型持有 morph_type + morph_id 两列）

Trait Implementations§

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impl Clone for Relation

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fn clone(&self) -> Relation

Returns a duplicate of the value. Read more

1.0.0 (const: unstable) · Source§

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

Performs copy-assignment from source. Read more

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impl Debug for Relation

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

Formats the value using the given formatter. Read more

Auto Trait Implementations§

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impl UnwindSafe for Relation

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

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impl<T> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)

Performs copy-assignment from self to dest. Read more

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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more

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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more

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impl<T, U> Into for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

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