use nested fields to avoid tons of extra SS api calls

backend/src/import-from-ss.js

@@ -34,7 +34,8 @@ const getContract = (name) => new ethers.Contract(
 );
 
 const fetchPaperInfo = async (paperId, retryDelay = 5000) => {
-  const url = `https://api.semanticscholar.org/graph/v1/paper/${paperId}?fields=title,url,authors,references`;
+  const url = `https://api.semanticscholar.org/graph/v1/paper/${paperId}?`
+  + 'fields=title,url,authors,references.title,references.url,references.authors';
   let retry = false;
   let paper;
   const response = await axios.get(url, {
@@ -146,19 +147,15 @@ module.exports = async (req, res) => {
   // Read the paper info from SS
   const paper = await fetchPaperInfo(paperId);
 
-  // Send HTTP code 202 - Accepted
-  res.status(202).end();
-
   console.log('references count:', paper.references.length);
 
   const eachCitationWeightPercent = Math.floor(30 / paper.references.length);
   const citations = await Promise.mapSeries(
     paper.references.filter((x) => !!x.paperId),
-    async ({ paperId: citedPaperId }) => {
+    async (citedPaper) => {
       // We need to fetch this paper so we can generate the post we WOULD add to the forum.
       // That way, if we later add the cited paper to the blockchain it will have the correct hash.
       // The forum allows dangling citations to support this use case.
-      const citedPaper = await fetchPaperInfo(citedPaperId);
       const citedPost = await generatePost(citedPaper);
       return {
         weightPercent: eachCitationWeightPercent,
@@ -187,10 +184,12 @@ module.exports = async (req, res) => {
   } catch (e) {
     if (e.reason === 'A post with this contentId already exists') {
       console.log(`Post already added for paper ${paperId}`);
+      res.status(204).end();
       return;
     }
     throw e;
   }
 
   console.log(`Added post to blockchain for paper ${paperId}`);
+  res.status(201).end();
 };