Hi,
I have a use case in node.js (express.js) and need help in implementing
this feature as it is getting very complicated. With very less experience
in node.js and npm, I am running into issues anf trying to find right
approach and node packages or libraries that could simplify my coding.
UseCase:
I have this dynamic JSON from front end-
University JSON Object -> has Schools Array -> Each school has dynamic
sized Depts Array.
*{*
*University:*
*{*
*univName : “Loyolla” , *
*location : “KT”,*
*Schools :[*
*{*
*schoolname: "ABC" , location: "x" , *
*Depts : [ {deptname: "dep1" },{deptname: "dep2" }]*
*},*
* {*
*schoolname: "BCD" , location: "y" , *
*Depts : [**{deptname: "dep1" },{deptname: "dep2" },{deptname: "dep3" }]*
*}*
*]*
*}}*
I transform this json into another JSON format and create multiple JSON
Objects out of it. For each dept + school combination along with common
univ info, we have separate object. In above ex, I will have 5 objects. For
simpliicity sake, assume, same format of JSON but 6 objects, but only 1
school + 1 dept infomation + common univ info. Ex, of just 1 object,
*University:*
*{*
*univName : “Loyolla” , *
*location : “KT”,*
*Schools :[*
*{*
*schoolname: "ABC" , location: "x" , *
*Depts : [ {deptname: "dep1" }]*
*}*
*}*
*]*
*}}*
Now, I have to POST these set of JSON objects ( say 5 here) to some service
via promise ??
Earlier we were planning to have just 1 JSON object for all this University
Info and send it over API (like 1st json with full info)but now, they
demand array of objects be created, for each dept value + school + univ,
so many JSON objects be POST'ed. I am highly confused how to achieve all
this.
For creating 1 object, I use request API ( request-promise). Body in
Options in request contains our JSON object.
*var options = {*
* method: 'POST',*
* uri: 'http://api.posttestserver.com/post',*
* body: {*
* some: 'payload'*
* },*
* json: true *
*};*
Now, instead of 1 object, I have array of objects. So body/payload is
slightly different each time and I will need to call same API over n times.
Do I need to call request promise in 'for' loop? ,
I was looking at different packages, I do not think promise-arrays is not
right package ? Any suggestions.
Another thing,, even simple 1 object creation, is nested under many
promises which I do not prefer but not - using promises was causing asyn
issues.
it makes GET call to API to fetch some IDs, then sets some JSON object,
POSTs that JSON, again get some results, read results,
and sets some key/values of above json dynamically based on results. So I
have 5-6 promises already nested and calls are dependent on previous calls
results. So how can i simplify my code? Please suggest if there are npm
mackages
that I can use.
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