sgnm-neo4j/src/filters/neo4j-error.filter.ts

neo4j module for nestJs

import { ExceptionFilter, Catch, ArgumentsHost } from "@nestjs/common";
import { Request, Response } from "express";
import { Neo4jError } from "neo4j-driver";

@Catch(Neo4jError)
export class Neo4jErrorFilter implements ExceptionFilter {
  catch(exception: Neo4jError, host: ArgumentsHost) {
    console.log("THİS İS NEO4J EXCEPTİON FİLTER");
    console.log(exception);
    console.log(exception.code);
    const ctx = host.switchToHttp();
    const response = ctx.getResponse<Response>();

    let statusCode = 500;
    let error = "Internal Server Error";
    let message: string[] = [];

    // Neo.ClientError.Schema.ConstraintValidationFailed
    // Node(54776) already exists with label `User` and property `email` = 'duplicate@email.com'
    if (exception.message.includes("already exists with")) {
      statusCode = 400;
      error = "Bad Request";

      const [_, property] = exception.message.match(/`([a-z0-9]+)`/gi);
      message = [`${property.replace(/`/g, "")} already taken`];
    }
    // Neo.ClientError.Schema.ConstraintValidationFailed
    // Node(54778) with label `Test` must have the property `mustExist`
    else if (exception.message.includes("must have the property")) {
      statusCode = 400;
      error = "Bad Request";

      const [_, property] = exception.message.match(/`([a-z0-9]+)`/gi);
      message = [`${property.replace(/`/g, "")} should not be empty`];
    }

    response.status(statusCode).json({
      statusCode,
      message,
      error,
    });
  }
}