Ramda - get array of objects using ids from other array - ramda.js

Question

I have two sets of data and I would like to use the first one to get an array of objects from the second one. I tried to deal with it by myself but I am missing few steps.
Here is set of ids to use:
const idSet = {
"41": {
"id": "41"
},
"42": {
"id": "42"
},
"43": {
"id": "43"
}
}
And here is second set:
const nodes = {
"3": {
"nodeCommentId": 3,
"nodeId": 43,
},
"4": {
"nodeCommentId": 4,
"nodeId": 41
},
"6": {
"nodeCommentId": 6,
"nodeId": 42
},
"7": {
"nodeCommentId": 7,
"nodeId": 44
},
}
I need to search by id and nodeId so I tried to use something like this to get only ids from first set:
const ids = R.compose(
R.values(),
R.pluck('id')
)(idSet)
I also came up with something like: R.filter(R.compose(R.flip(R.contains)(ids), R.prop('nodeId')), nodes);
But then I have nodeId which is a number and not a string plus I need an array of objects without keys.
Desired output:
[
{
nodeCommentId: 3,
nodeId: 43
},
{
nodeCommentId: 4,
nodeId: 41
},
{
nodeCommentId: 6,
nodeId: 42
}
]
Any help will be appreciated.

Answer 1

This is probably too ugly to use, but it might be a start at a nice solution:
const nodesById = (idSet) => {
const ids = map (Number, pluck ('id') (values (idSet)))
return pipe (values, filter (pipe (prop('nodeId'), contains(__, ids))))
}
const idSet = {41: {id: "41"}, 42: {id: "42"}, 43: {id: "43"}}
const nodes = {3: {nodeCommentId: 3, nodeId: 43, }, 4: {nodeCommentId: 4, nodeId: 41}, 6: {nodeCommentId: 6, nodeId: 42}, 7: {nodeCommentId: 7, nodeId: 44}}
console .log (
nodesById (idSet) (nodes)
)
.as-console-wrapper {max-height: 100% !important; top: 0}
<script src="//cdnjs.cloudflare.com/ajax/libs/ramda/0.27.1/ramda.min.js"></script>
<script>const {map, pluck, values, pipe, filter, prop, contains, __} = R </script>
I'm sure that with a little work, we could make this entirely point-free, but I doubt that will help readability.

Answer 2

Transform the idSet to an array of numbers, and then user R.innerJoin to get the items with the matching nodeId:
const { pipe, values, pluck, map, innerJoin, __, curry } = R
const getIds = pipe(values, pluck('id'), map(Number))
const getNodesById = curry((idSet, nodes) =>
pipe(
values,
innerJoin(
({ nodeId }, id) => nodeId === id,
__,
getIds(idSet)
)
)(nodes)
)
const idSet = {41: {id: "41"}, 42: {id: "42"}, 43: {id: "43"}}
const nodes = {3: {nodeCommentId: 3, nodeId: 43, }, 4: {nodeCommentId: 4, nodeId: 41}, 6: {nodeCommentId: 6, nodeId: 42}, 7: {nodeCommentId: 7, nodeId: 44}}
const result = getNodesById(idSet)(nodes)
console.log(result)
.as-console-wrapper {max-height: 100% !important; top: 0}
<script src="//cdnjs.cloudflare.com/ajax/libs/ramda/0.27.1/ramda.min.js"></script>