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37 lines
1.2 KiB
JavaScript
37 lines
1.2 KiB
JavaScript
"use strict";
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const Promise = require("bluebird");
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const memoizee = require("memoizee");
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// FIXME: Figure out a reasonable way to make this symbol its own (conflict-free) package, given that it'll be used all across both sysquery and CVM
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const All = require("../graphql-interface/symbols/all");
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// This generates a (memoized) source function for commands that always produce an entire list, that needs to be filtered for the desired item(s)
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module.exports = function evaluateAndPick({ command, selectResult, selectID, many }) {
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let commandOnce = memoizee(command);
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return function (ids) {
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return Promise.try(() => {
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return commandOnce();
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}).then((result) => {
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if (selectResult != null) {
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return selectResult(result);
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} else {
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return result;
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}
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}).then((items) => {
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return ids.map((id) => {
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if (id === All) {
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return items;
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} else if (many === true) {
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// NOTE: This produces nested arrays! One array for each input ID.
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return items.filter((item) => selectID(item) === id);
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} else {
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// TODO: Can this be more performant? Currently it is a nested loop
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return items.find((item) => selectID(item) === id);
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}
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});
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});
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};
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};
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