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44 lines
1.1 KiB
44 lines
1.1 KiB
import {Model} from '../Model.ts'
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import {HasOneOrMany} from './HasOneOrMany.ts'
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import {Collection} from '../../../../lib/src/collection/Collection.ts'
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import {Logging} from '../../../../lib/src/service/logging/Logging.ts'
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/**
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* Relation class for one-to-one relations.
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* @extends HasOneOrMany
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*/
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export class HasOne<T extends Model<T>, T2 extends Model<T2>> extends HasOneOrMany<T, T2> {
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/**
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* The cached value of this relation.
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* @type Model
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*/
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protected _value?: T2
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/**
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* True if the relation has been loaded.
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* @type boolean
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*/
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protected _loaded = false
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public async get(): Promise<T2 | undefined> {
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return this.fetch().first()
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}
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public set_value(related: Collection<T2>) {
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this._value = related.first()
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this._loaded = true
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if ( related.length > 1 ) {
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this.make(Logging).warn(`HasOne relation result contained more than one value for ${this.qualified_local_key} -> ${this.qualified_local_key}`)
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}
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}
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public get_value(): T2 | undefined {
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return this._value
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}
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public is_loaded(): boolean {
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return this._loaded
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}
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}
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