Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 | 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 2x 2x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 39x 37x 39x 3x 24x 24x 18x 18x 6x 24x 24x 24x 3x 3x 3x 3x 3x | import { assign, Mutable, TypeOf } from '@sgrud/core';
import { Model } from '../model/model';
/**
* Unique symbol used as property key by the {@link HasMany} decorator to
* register decorated {@link Model} fields for further computation, e.g.,
* serialization, treemapping etc.
*
* @see {@link HasMany}
*/
export const hasMany = Symbol('@sgrud/data/model/has-many');
/**
* {@link Model} field decorator factory. Using this decorator, {@link Model}s
* can be enriched with one-to-many associations to other {@link Model}s. The
* value for the `typeFactory` argument has to be another {@link Model}. By
* applying this decorator, the decorated field will (depending on the
* `transient` argument value) be taken into account when serializing or
* treemapping the {@link Model} containing the decorated field.
*
* @param typeFactory - A forward reference to the field value constructor.
* @param transient - Whether the decorated field is `transient`.
* @typeParam T - The field value constructor type.
* @returns A {@link Model} field decorator.
*
* @example
* {@link Model} with a one-to-many association:
* ```ts
* import { HasMany, Model } from '@sgrud/data';
* import { OwnedModel } from './owned-model';
*
* export class ExampleModel extends Model<ExampleModel> {
*
* @HasMany(() => OwnedModel)
* public field?: OwnedModel[];
*
* protected [Symbol.toStringTag]: string = 'ExampleModel';
*
* }
* ```
*
* @see {@link Model}
* @see {@link HasOne}
* @see {@link Property}
*/
export function HasMany<T extends Model.Type<Model>>(
typeFactory: () => T,
transient: boolean = false
) {
/**
* @param model - The {@link Model} to be decorated.
* @param field - The {@link Model} `field` to be decorated.
*/
return function<M extends Model>(model: M, field: Model.Field<M>): void {
const key = '#' + field as Model.Field<M>;
if (!transient) {
assign((model as Mutable<M>)[hasMany] ||= {}, {
[field]: typeFactory
});
}
Object.defineProperties(model, {
[key]: {
writable: true
},
[field]: {
enumerable: true,
get(this: M): InstanceType<T>[] | null | undefined {
if (TypeOf.null(this[key])) return null;
else return (this[key] as InstanceType<T>[])?.slice();
},
set(this: M, value?: InstanceType<T>[]): void {
if (TypeOf.null(value)) {
(this[key] as unknown) = null;
} else if (!TypeOf.undefined(value)) {
(this[key] as unknown) = value.map((i) => new (typeFactory())(i));
} else return;
this.changes.next(this);
}
}
});
};
}
|