class-validator#IsEmpty TypeScript Examples

/**
 * Adds new (unknown) clocks to local db. It will set local clock to the max of twc clocks
 *
 * @param processes clocks (typically from a knowledge vector )
 */
export async function mergeKnowledgeVectors(processes: Process[]) {
  let clockRepo = getMongoRepository(Process);

  for (const process of processes) {
    const processExists = await clockRepo.findOne({ id: process.id });
    if (isEmpty(processExists)) {
      assert(isNotEmpty(process.id));
      await clockRepo.save(process);
    } else {
      assert(process.id === processExists.id);
      const maxClock = Math.max(processExists.clock, process.clock);
      if (maxClock === process.clock) await clockRepo.updateOne({ id: process.id }, { $set: { clock: maxClock } });
    }
  }
}

export async function processEntity(...entityParams) {
   if (entityParams) {
     entity = entityParams[0];
     repository = entityParams[1];
   } else {
     console.log("Incorrect number of params sent from RevisionRecord to EnableEntity");
   }
   try {
     const entityExists = await repository.findOne({ uuid: entity.object.uuid });
     // if entity exists, don't overwrite
     if (isEmpty(entityExists)) {
       const task = repository.create(entity.object);
       task.kv = await getLatestKnowledgeVector();
       console.log(util.inspect(task, false, null, true /* enable colors */));
       await repository.save(task);
       //await createOrIncrementClock();
     }
   } catch (e) {
     //res.status(409).send("Entity exists");
     return;
   }
}

/**
   * TODO Implement id based lookup
   * @param req
   * @param res
   */
  static getOneById = async (req: Request, res: Response) => {
    const revisionRecordRepository = getRepository(OCKRevisionRecord);
    const revisionRecords = await revisionRecordRepository.find();

    //console.log(util.inspect(revisionRecords, false, null, true /* enable colors */));
    res.send(isEmpty(revisionRecords) ? {} : revisionRecords);
  };

@Column({ length: 50 })
  @IsString({ always: true })
  @IsEmpty({ always: true, message: 'hey...' })
  // tslint:disable-next-line: variable-name
  original_name: string;

@Column({ length: 50 })
  @IsString({ always: true })
  @IsEmpty({ always: true, message: 'hey...' })
  // tslint:disable-next-line: variable-name
  current_name: string;

@Column({ length: 50 })
  @IsString({ always: true })
  @IsEmpty({ always: true, message: 'hey...' })
  extention: string;

@Column({ type: 'int' })
  @IsNumber()
  @IsEmpty({ always: true, message: 'hey...' })
  size: number;

@Column({ default: 0, type: 'int' })
  @IsEmpty({ always: true, message: 'hey...' })
  @IsNumber({ allowNaN: false, allowInfinity: false })
  // tslint:disable-next-line: variable-name
  comments_num: number;

@Column({ type: 'enum', enum: Roles, default: Roles.user })
  @IsEmpty({ always: true, message: 'hey...' })
  role: Roles;

static listAll = async (req: Request, res: Response) => {
    console.log(util.inspect(req.query.knowledgeVector, false, null, true /* enable colors */));

    if (isEmpty(req.query.knowledgeVector)) {
      res
        .status(400)
        .send(
          'Must send an array of knowledge vectors as query param. An empty knowledge vector would be { processes: [{ id : "validUUIDv4" , clock : 0 } ]}'
        );
      return;
    }

    // Thorough JSON validation using JSON Schema, TypedJSON and class-validator
    const ajv = new Ajv();
    const valid = ajv.validate(kvSchema, req.query.knowledgeVector);
    if (!valid) {
      console.log(ajv.errors);
      res.status(400).send(ajv.errors);
      return;
    }

    let incomingKV: KnowledgeVector;
    try {
      incomingKV = new TypedJSON(KnowledgeVector).parse(req.query.knowledgeVector);
    } catch (error) {
      res.status(400).send("JSON schema error");
      return;
    }

    console.log(util.inspect(incomingKV, false, null, true /* enable colors */));

    const errors = await validate(incomingKV);
    if (errors.length > 0) {
      res.status(400).send(errors);
      return;
    }

    //console.log(util.inspect(incomingKV, false, null, true /* enable colors */));

    let returnRevRecord = new OCKRevisionRecord();
    returnRevRecord.entities = [];

    // Case 1 : iOS device is syncing for the first time, it has no knowledge of the servers clock
    if (isEmpty(incomingKV.processes.find((process) => process.id === uuid))) {
      // store incoming clock locally
      let clockRepo = getMongoRepository(Process);

      for (const process of incomingKV.processes) {
        assert(isUUID(process.id));
        const processExists = await clockRepo.findOne({ id: process.id });
        if (isEmpty(processExists)) {
          assert(isNotEmpty(process.id));
          await clockRepo.save(process);
        }
      }

      // send all outcomes and tasks
      const taskRepository = getMongoRepository(OCKTask);
      const tasks = await taskRepository.find({});

      const outcomeRepository = getMongoRepository(OCKOutcome);
      const outcomes = await outcomeRepository.find({});

      tasks.map((entity) => {
        delete entity.kv;
        returnRevRecord.entities.push({ type: "task", object: entity });
      });
      outcomes.map((entity) => {
        delete entity.kv;
        returnRevRecord.entities.push({ type: "outcome", object: entity });
      });

      // set kv for revisionRecord
      returnRevRecord.knowledgeVector = await getLatestKnowledgeVector();

      //console.log(util.inspect(returnRevRecord, false, null, true /* enable colors */));
      res.status(201).send(returnRevRecord);
      return;
    }

    // Case 2 : It has synced before but its clock might be older than local, send entities newer than clock
    const clock = incomingKV.processes.find((process) => process.id === uuid).clock;
    assert(!isEmpty(clock), "clock cannot be undefined at this point");

    const taskRepository = getMongoRepository(OCKTask);
    const tasks = await taskRepository.find({
      $and: [{ "kv.processes.clock": { $gt: clock } }, { "kv.processes.id": { $eq: uuid } }],
    });

    const outcomeRepository = getMongoRepository(OCKOutcome);
    const outcomes = await outcomeRepository.find({
      $and: [{ "kv.processes.clock": { $gt: clock } }, { "kv.processes.id": { $eq: uuid } }],
    });

    tasks.map((entity) => {
      delete entity.kv;
      returnRevRecord.entities.push({ type: "task", object: entity });
    });
    outcomes.map((entity) => {
      delete entity.kv;
      returnRevRecord.entities.push({ type: "outcome", object: entity });
    });

    // set kv for revisionRecord
    returnRevRecord.knowledgeVector = await getLatestKnowledgeVector();

    //console.log(util.inspect(returnRevRecord, false, null, true /* enable colors */));
    res.status(201).send(returnRevRecord);
  };