#843·Eve

accumulateChanges supports only a single value per attribute

Author: btheadoCreated Jun 10, 2017Updated Jun 14, 2017

I'm trying to write a watcher to persist data externally, but I'm getting the error, "accumulateChanges supports only a single value per attribute"

Here is the code (stored in file persist-test.js):

import { Program } from "witheve";

let prog = new Program("persist test");

prog.load(`
~~~
search
  sort = math/range[start: 1 stop: 1]

commit
  [#counter #persist sort count: 0]
~~~
`);

prog.watch("Export #persist tagged data to a tiddler", ({find, record, lookup}) => {
  let rec = find("persist");
  let {attribute, value} = lookup(rec);

  return [
    rec.add(attribute, value)
  ];
})
.asObjects(({adds, removes}) => {
  console.log("obj add  " + JSON.stringify(adds));
  console.log("obj rem  " + JSON.stringify(removes));
});

And I'm running it like this:

bash

node build/src/cli.js -H build/programs/persist-test.js

If I change the watch block to instead look like this:

prog.watch("Export #persist tagged data to a tiddler", ({find, record, lookup}) => {
  let counter = find("counter");
  let {count, sort} = counter;

  return [
    record("counter", {count, sort})
  ];
})

then I don't get the error and I get some reasonable looking output:

obj add  {"tag|counter|count|0|sort|1":{"tag":"counter","sort":1,"count":0}}
obj rem  {}

Source: witheve/Eve

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