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// Like withReverseReferenceList, but for finding all things which reference
// the current thing by a property that contains a single reference, rather
// than within a reference list.
import withReverseList_template from './helpers/withReverseList-template.js';
import {input} from '#composite';
import {withMappedList} from '#composite/data';
export default withReverseList_template({
annotation: `withReverseSingleReferenceList`,
propertyInputName: 'ref',
outputName: '#reverseSingleReferenceList',
customCompositionSteps: () => [
{
dependencies: [input('data')],
compute: (continuation, {
[input('data')]: data,
}) => continuation({
['#referencingThings']:
data,
}),
},
// This map wraps each referenced thing in a single-item array.
// Each referencing thing references exactly one thing, if any.
{
dependencies: [input('ref')],
compute: (continuation, {
[input('ref')]: ref,
}) => continuation({
['#singleReferenceMap']:
thing =>
(thing[ref]
? [thing[ref]]
: []),
}),
},
withMappedList({
list: '#referencingThings',
map: '#singleReferenceMap',
}).outputs({
'#mappedList': '#referencedThings',
}),
],
});
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