fix new freebie bug and first page detection

lib/apollo.js

@@ -1,5 +1,5 @@
 import { ApolloClient, InMemoryCache, from, HttpLink } from '@apollo/client'
-import { isFirstPage } from './cursor'
+import { decodeCursor, LIMIT } from './cursor'
 import { RetryLink } from '@apollo/client/link/retry'
 
 const additiveLink = from([
@@ -7,6 +7,17 @@ const additiveLink = from([
   new HttpLink({ uri: '/api/graphql' })
 ])
 
+function isFirstPage (cursor, existing) {
+  if (cursor) {
+    const decursor = decodeCursor(cursor)
+    return decursor.offset === LIMIT
+  } else {
+    // we don't have anything cached, or our existing items are less than
+    // or equal to a full page TODO test for off by one
+    return !existing || !existing.items || existing.items.length < LIMIT
+  }
+}
+
 export default new ApolloClient({
   uri: '/api/graphql',
   link: additiveLink,
@@ -17,7 +28,7 @@ export default new ApolloClient({
           moreItems: {
             keyArgs: ['sort', 'userId'],
             merge (existing, incoming) {
-              if (incoming.cursor && isFirstPage(incoming.cursor)) {
+              if (isFirstPage(incoming.cursor, existing)) {
                 return incoming
               }
 
@@ -30,7 +41,7 @@ export default new ApolloClient({
           moreFlatComments: {
             keyArgs: ['userId'],
             merge (existing, incoming) {
-              if (incoming.cursor && isFirstPage(incoming.cursor)) {
+              if (isFirstPage(incoming.cursor, existing)) {
                 return incoming
               }
 
@@ -43,7 +54,7 @@ export default new ApolloClient({
           notifications: {
             keyArgs: false,
             merge (existing, incoming) {
-              if (incoming.cursor && isFirstPage(incoming.cursor)) {
+              if (isFirstPage(incoming.cursor, existing)) {
                 return incoming
               }
 

lib/cursor.js

@@ -14,8 +14,3 @@ export function nextCursorEncoded (cursor) {
   cursor.offset += LIMIT
   return Buffer.from(JSON.stringify(cursor)).toString('base64')
 }
-
-export function isFirstPage (cursor) {
-  const decursor = decodeCursor(cursor)
-  return decursor.offset === LIMIT
-}

prisma/migrations/20210908193444_tips/migration.sql

@@ -106,7 +106,7 @@ DECLARE
 BEGIN
     PERFORM ASSERT_SERIALIZED();
 
-    SELECT (msats / 1000), id, "freePosts", "freeComments"
+    SELECT (msats / 1000), "freePosts", "freeComments"
     INTO user_sats, free_posts, free_comments
     FROM users WHERE id = user_id;
 
@@ -119,7 +119,7 @@ BEGIN
     INSERT INTO "Item" (title, url, text, "userId", "parentId", created_at, updated_at)
     VALUES (title, url, text, user_id, parent_id, now_utc(), now_utc()) RETURNING * INTO item;
 
-    IF freebie THEN
+    IF freebie = true THEN
         IF parent_id IS NULL THEN
             UPDATE users SET "freePosts" = "freePosts" - 1 WHERE id = user_id;
         ELSE