relation

package

v0.6.0 Latest Latest Go to latest Published: Nov 3, 2026 License: MIT Imports: 4 Imported by: 0

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github.com/weiloon1234/Foundry-Go

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Documentation ¶

Overview ¶

Package relation provides explicit loaded states for typed model relations. Reading a relation value never performs database I/O.

Index ¶

type Link
type Many
- func Collection[M any](items []M) Many[M]
- func FoundryCollection[M any](seal sqlowner.CollectionSeal, items []M) Many[M]
type One
- func Single[M any](model value.Optional[M]) One[M]
- func (r One[M]) Get() (value.Optional[M], bool)
- func (r One[M]) IsLoaded() bool
type Through
- func FoundryLinked[M, P any](seal sqlowner.CollectionSeal, items []Link[M, P]) Through[M, P]
- func Linked[M, P any](items []Link[M, P]) Through[M, P]
type Value
- func Computed[V any](v V) Value[V]
- func (v Value[V]) Get() (V, bool)
- func (v Value[V]) IsLoaded() bool

Constants ¶

This section is empty.

Variables ¶

This section is empty.

Functions ¶

This section is empty.

Types ¶

type Link ¶

type Link[M, P any] struct {
	Model M
	Pivot P
}

Link keeps each related model beside the concrete pivot model for that edge. A target shared by several parents never acquires another parent's pivot data.

type Many ¶

type Many[M any] struct {
	// contains filtered or unexported fields
}

Many distinguishes not loaded from a loaded collection, including an empty collection. Its private slice is copied at construction and retrieval.

func Collection ¶

func Collection[M any](items []M) Many[M]

Collection constructs a loaded relation with a shallow copy of items, including an empty collection.

func FoundryCollection ¶

func FoundryCollection[M any](seal sqlowner.CollectionSeal, items []M) Many[M]

FoundryCollection publishes a caller-independent collection for framework loaders. An invalid capability leaves the relation unloaded.

func (Many[M]) All ¶

func (r Many[M]) All() iter.Seq2[int, M]

All yields each loaded item by value without copying the collection. Nothing is yielded when the relation is not loaded.

func (Many[M]) Get ¶

func (r Many[M]) Get() ([]M, bool)

Get returns a caller-owned copy and whether the collection was loaded. Use Len and All to read a large collection without copying it.

func (Many[M]) IsLoaded ¶

func (r Many[M]) IsLoaded() bool

IsLoaded reports whether the collection was loaded, including a loaded empty collection.

func (Many[M]) Len ¶

func (r Many[M]) Len() int

Len reports the number of loaded items; it is zero when not loaded.

type One ¶

type One[M any] struct {
	// contains filtered or unexported fields
}

One distinguishes not loaded, loaded empty and loaded with a model. Its private pointer permits self-relations without an infinitely sized Go struct.

func Single ¶

func Single[M any](model value.Optional[M]) One[M]

Single constructs a loaded singular relation, including an absent model.

func (One[M]) Get ¶

func (r One[M]) Get() (value.Optional[M], bool)

Get returns the optional related model and whether the relation was loaded. A loaded but absent model differs from a relation that has not been loaded.

func (One[M]) IsLoaded ¶

func (r One[M]) IsLoaded() bool

IsLoaded reports whether the singular relation was loaded, including a loaded empty relation.

type Through ¶

type Through[M, P any] struct {
	// contains filtered or unexported fields
}

Through is a loaded many-to-many collection with typed pivot data. Distinct pivot rows remain distinct links even when they refer to the same target.

func FoundryLinked ¶

func FoundryLinked[M, P any](seal sqlowner.CollectionSeal, items []Link[M, P]) Through[M, P]

FoundryLinked publishes a caller-independent link collection for framework loaders. Only framework loaders can issue a valid seal; applications use Linked.

func Linked ¶

func Linked[M, P any](items []Link[M, P]) Through[M, P]

Linked constructs a loaded collection, including a loaded empty collection.

func (Through[M, P]) All ¶

func (r Through[M, P]) All() iter.Seq2[int, Link[M, P]]

All yields each loaded link by value without copying the collection.

func (Through[M, P]) Get ¶

func (r Through[M, P]) Get() ([]Link[M, P], bool)

Get returns a copied link collection and whether it was loaded. Model fields inside each link retain ordinary Go value-copy semantics.

func (Through[M, P]) IsLoaded ¶

func (r Through[M, P]) IsLoaded() bool

IsLoaded reports whether the pivot collection was loaded, including a loaded empty collection.

func (Through[M, P]) Len ¶

func (r Through[M, P]) Len() int

Len reports the number of loaded links; it is zero when not loaded.

type Value ¶

type Value[V any] struct {
	// contains filtered or unexported fields
}

Value is a loaded aggregate slot. V describes SQL nullability independently of loaded state: for example Value[value.Nullable[decimal.Decimal]].

func Computed ¶

func Computed[V any](v V) Value[V]

Computed constructs a loaded aggregate, including zero or a SQL NULL value.

func (Value[V]) Get ¶

func (v Value[V]) Get() (V, bool)

Get returns the aggregate and whether it was loaded; an unloaded slot returns the zero V and false.

func (Value[V]) IsLoaded ¶

func (v Value[V]) IsLoaded() bool

IsLoaded reports whether the aggregate slot was populated.

Source Files ¶

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