submitOp support custom field?

[aeroyu]

ex,i want to record who submit the op,pass the userId and save。
when I query by version，i can get who submit

[alecgibson]

You can update the m metadata field in middleware, like so:

backend.use('connect', (request, callback) => {
  // request.agent.custom is a place for holding arbitrary data you attach
  // from the connection. It's available in all other middleware.
  // request.req comes from the second argument of backend.listen (see below)
  request.agent.custom = request.req;
});

backend.use('submit', (request, callback) => {
  // We can just attach the metadata from our agent.custom object to the
  // op.m metadata field
  request.op.m.userId = request.agent.custom.userId;
});

// Pass user information in when establishing their connection. This will come from
// a cookie or database, or whatever auth mechanism you've used
backend.listen(stream, {userId: '123'});

// Fetch ops from v5 (inclusive) to v10 (non-inclusive), along with the metadata,
// which includes the custom userId we set:
backend.getOps(agent, 'collection', 'id', 5, 10, {opsOptions: {metadata: true}}, (error, ops) => {
  // ops has the metadata attached to each op
});

[aeroyu]

req can pass in client submitOp method,in my case i need to related the op version and the user

[alecgibson]

The op version is already stored on the op, which you'll have access to on the request object.

[aeroyu]

any example? thx,how can i stored userId to op

[alecgibson]

I just gave you an example above.

[aeroyu]

i get the example from #224 and slove it
but another question is , i use client api fetchSnapshot and the result m is null

[alecgibson]

Yes unfortunately the fetchSnapshot doesn't currently support any options (and hence can't send back metadata). You'll need to make a separate (server-side) call to backend.getOps (as outlined above), or we're more than happy to accept a Pull Request that adds this functionality!

[aeroyu]

：》

[nieyuyao]

How can I add custom filed when submit op at client side? The methods mentioned above are all completed on the server side？:)

[alecgibson]

@nieyuyao can you please provide a use-case example?

[nieyuyao]

@nieyuyao can you please provide a use-case example?

Oh, my bad. I misunderstand！Thanks :)

[listar]

client 的 sendOp函数源代码如下：

var message = {
    a: 'op',
    c: doc.collection,
    d: doc.id,
    v: doc.version,
    src: op.src,
    seq: op.seq,
    x: {}
  };
  if ('op' in op) message.op = op.op;
  if (op.create) message.create = op.create;
  if (op.del) message.del = op.del;
  if (doc.submitSource) message.x.source = op.source;
  this.send(message);

客户端 doc.submitSource = true

doc.submitOp(
	task,
	{
		source: {
			clientId: this.engineOt.clientId,
			reqId: this.sendId
		}
	},
	error => {
		error && this.submitOpErrorHandle(error, task)
	}
)

在source内补充你想要补充的数据