Feathers Schema Validation Error Helpers

schema-error-helpers.ts

import { FeathersError } from '@feathersjs/errors';
import { DefinedError } from 'ajv';
import { HookContext } from '@feathersjs/feathers';

class ValidationError extends FeathersError {
  constructor(message: string, data: DefinedError[]) {
    super(message, 'Validation Failed', 400, '', data);
  }
}

export const errorHandler = (context: HookContext) => {
  // Handles Feathers schema validation errors
  if (context.error.message === 'validation failed') {
    const error = context.error;

    const validationErrors: DefinedError[] = error.data;

    const {
      hook: { path, method, type },
    } = error;

    const data: DefinedError[] = validationErrors.map((e) => {
      return { ...e, service: path, method, hookType: type };
    });

    let message = '';

    if (process.env.NODE_ENV === 'testing') {
      // Prints out full error
      message += `\nIn service: ${error.hook.path}, \n`;
      message += `In method: ${error.hook.method}, \n`;
      message += `In hook: ${error.hook.type}, \n`;
      message += `Error: ${JSON.stringify(validationErrors)}`;
    } else {
      const paramsString = JSON.stringify(validationErrors[0].params)
        .replace('{', '')
        .replace('}', '');

      // Prints out more human-readable error
      message += `${validationErrors[0].message} - ${paramsString}`;
    }

    const newError = new ValidationError(message, data);

    context.error = newError;
    return context;
  }
};