Preparing NodeJS DB content for use in Mustache - json

Question

I have a library of FAQs that are split up into tabs on the front end, we have since built a NodeJS app that handles them so we can have a database of FAQs instead of hardcoded HTML.
I have a NodeJS model generating a JSON file that is filtering the questions by their tab association using the following:
res = _.groupBy(res, 'tab_title');
Which is outputting this.
However, below is the structure of the original JSON file that the Mustache tags in the template are expecting it to look like:
{
"tabs": [
{
"title": "Tab title",
"id": 1,
"questions": [
{
"question": "Question here",
"id": 1,
"answer": "Answer here"
},
{
"question": "Question two",
"id": 2,
"answer": "Answer here"
}
]
},
{
"title": "Another title",
"id": 2,
"questions": [
{
"question": "Question here",
"id": 1,
"answer": "Answer here"
},
{
"question": "Question two",
"id": 2,
"answer": "Answer here"
}
]
}
}
This is so the front end tags can just loop over the tabs, then loop over the questions within the tabs so the front end is relatively automated.
I have tried to use the _.map function to output all the appropriate information in this structure but I'm really struggling. Can anyone point my in a direction that could help?
I hope this is enough information, but if not, I can supply more.
Thanks!

Answer 1

So we start by generating the groups like you did.
_.groupBy(myArray, 'tab_title');
However, that doesn't quite solve our issue here, the object still wont match the intended structure. It'll look like :
{
"tab_title1" : [{...}, {...}],
"tab_title2" : [{...}, {...}]
}
So we could use the map function to process this further :
_.map(groupObject, (lstFaqs, tab_title) => {
let first = _.first(lstFaqs),
tab_object = {
title: first.tab_title,
id: first.tab_id,
questions: _.map(lstFaqs, (faqItem) => {
id: faqItem.faq_id,
question : faqItem.faq_question,
answer : faqItem.faq_answer
})
}
return tab_object;
})
We'll end up with an array of tab_object. So to finalize the formatting :
let result = { "tabs" : array_of_tab_object }
I hope this help!