add link to yesterday's daily discussion

api/resolvers/item.js

@@ -398,6 +398,29 @@ export default {
 
       return pin.position
     },
+    prior: async (item, args, { models }) => {
+      if (!item.pinId) {
+        return null
+      }
+
+      const prior = await models.item.findFirst({
+        where: {
+          pinId: item.pinId,
+          createdAt: {
+            lt: item.createdAt
+          }
+        },
+        orderBy: {
+          createdAt: 'desc'
+        }
+      })
+
+      if (!prior) {
+        return null
+      }
+
+      return prior.id
+    },
     user: async (item, args, { models }) =>
       await models.user.findUnique({ where: { id: item.userId } }),
     ncomments: async (item, args, { models }) => {

api/typeDefs/item.js

@@ -64,5 +64,6 @@ export default gql`
     comments: [Item!]!
     path: String
     position: Int
+    prior: Int
   }
 `

components/item.js

@@ -70,6 +70,13 @@ export default function Item ({ item, rank, children }) {
               <Link href={`/items/${item.id}`} passHref>
                 <a title={item.createdAt} className='text-reset'>{timeSince(new Date(item.createdAt))}</a>
               </Link>
+              {item.prior &&
+                <>
+                  <span> \ </span>
+                  <Link href={`/items/${item.prior}`} passHref>
+                    <a className='text-reset'>yesterday</a>
+                  </Link>
+                </>}
             </span>
             {canEdit &&
               <>

fragments/items.js

@@ -72,6 +72,7 @@ export const ITEM_FULL = gql`
   query Item($id: ID!) {
     item(id: $id) {
       ...ItemFields
+      prior
       position
       text
       comments {