@elsikora/nestjs-crud-automator/dist/esm/utility/api/route/discriminator/resolve-dto.utility.js

A library for automating the creation of CRUD operations in NestJS.

import { ApiRouteValidateDiscriminatedDtoProperties } from './validate-dto-properties.utility.js';
import { ErrorException } from '../../../error/exception.utility.js';

/**
 * Selects the route DTO class for a payload using the configured discriminator mapping.
 * @param {TApiRouteDiscriminatedDtoProperties} properties - Route-level discriminated DTO config.
 * @param {unknown} payload - Request or response payload.
 * @param {string} context - Error message context.
 * @returns {Type<unknown>} Selected DTO class.
 */
function ApiRouteResolveDiscriminatedDto(properties, payload, context) {
    ApiRouteValidateDiscriminatedDtoProperties(properties, context);
    if (!payload || typeof payload !== "object" || Array.isArray(payload)) {
        throw ErrorException(`${context} discriminator payload error: payload must be an object`);
    }
    const payloadAsRecord = payload;
    const discriminatorPropertyName = properties.discriminator.propertyName;
    if (!(discriminatorPropertyName in payloadAsRecord)) {
        throw ErrorException(`${context} discriminator payload error: missing required discriminator field '${discriminatorPropertyName}'`);
    }
    const discriminatorValue = payloadAsRecord[discriminatorPropertyName];
    if (typeof discriminatorValue !== "string" || discriminatorValue === "") {
        throw ErrorException(`${context} discriminator payload error: invalid discriminator value '${String(discriminatorValue)}' for field '${discriminatorPropertyName}'`);
    }
    const dto = properties.discriminator.mapping[discriminatorValue];
    if (!dto) {
        throw ErrorException(`${context} discriminator payload error: invalid discriminator value '${discriminatorValue}' for field '${discriminatorPropertyName}'`);
    }
    return dto;
}

export { ApiRouteResolveDiscriminatedDto };
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