node.js - 跳过环回中的删除操作，发送自定义响应对象

Question

我想覆盖 strongloop 中的默认删除操作，并用某种“软删除”替换它们，它只是将标志设置为已删除。到目前为止，我已经了解了原始操作，并且没有调用 next() 函数，该操作不允许对数据库进行操作。但它也没有发送任何响应状态。那么执行此操作或发送自定义响应对象的最佳方法是什么？

module.exports = function (Module) {
  Module.observe('before delete', function(ctx, next) {
    id = ctx.where['id'];
    Module.update({id: id}, {deleted: true}, null);
    //next(); // don't call next to avoid deleting
  }); 

更新:不是解决方案，但至少它触发了对 API 的一些响应:

Module.observe('before delete', function(ctx, next) {
    var id = ctx.where['id'];
    Module.update({id: id}, {deleted: true}, null);

    // dirty method to trigger response
    var err = new Error();  // create new error object
    err.statusCode = 204;   // set response code to empty response
    next(err);

  });

Answer 1

编辑正确答案如下:

module.exports = function(Model) {
  let app;
  Model.once('attached', (a) => {
    app = a;

    const deleteById = Model.deleteById;

    Model.deleteById = (id, options, cb) => {
      Model.updateAll({id: id}, {
        deletedAt: new Date(),
        deletedBy: options.accessToken.userId,
      });
      cb(null,'deleted')
    };

    // ...
  });
}

在 LB2 和 LB3 中，一种方法是使用操作钩子(Hook)。在相关的 model.js 文件中添加:

module.exports = function(Model) {
  let app;
  Model.once('attached', (a) => {
    app = a;
    Model.observe('before delete', (ctx, next) => {
      Model.findById(ctx.where.id, (err, instance) => {
        if (err) {
          return next(err);
        }
        instance.deletedAt = new Date();

        // ...
        // other modifications to instance
        // ...

        // save this in the hookState to retrieve it in after delete hook
        ctx.hookState.deletedModelInstance = instance;
        next();
      });
    });

    Model.observe('after delete', (ctx, next) => {
      Model.replaceOrCreate(ctx.hookState.deletedModelInstance,
        (err, instance) => {
          if (err) {
            console.log(
              'An error occured while restoring data ' +
              'from hookState after delete operation'
            );
          }
        next();
      });
    });
  });
}