@adonis-agora/filter/dist/src/base_filter.js

Server-side query filtering/sorting/pagination for AdonisJS — Spatie-style input, a Lucid adapter, and field allow-listing. Part of the Agora ecosystem.

/**
 * The class-authoring form of a filter over ANY backend — the generic base behind
 * {@link import('./base_model_filter.js').BaseModelFilter} (Lucid) and custom backends
 * (in-memory stores, engine clients, predicate bags) alike: **one style that does everything**.
 *
 * A method's name IS the key it owns, `setup()` runs on every call before anything the request
 * asked for, and the class is resolved through the IoC container so an `@inject()`ed constructor
 * works — exactly the shape AdonisJS developers know from `adonis-lucid-filter`. What differs per
 * backend is only what `$query` IS: a Lucid builder for models, a draft the methods narrow for
 * anything else.
 *
 * ```ts
 * export class RunFilter extends BaseFilter<RunQueryDraft> {
 *   declare $query: RunQueryDraft;
 *
 *   status(value: unknown, operator: string) {
 *     const values = (Array.isArray(value) ? value : [value]).map(String);
 *     this.$query.narrow(values.length === 1 ? { status: values[0] } : { statuses: values });
 *   }
 * }
 *
 * const draft = new RunQueryDraft();
 * await applyCustomFilter(draft, RunFilter, ctx);
 * ```
 */
export class BaseFilter {
    input(key, fallback) {
        if (key === undefined)
            return this.$input;
        return Object.hasOwn(this.$input, key) ? this.$input[key] : fallback;
    }
}
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