fix: indexing contract (#30)

Author: bl0up

subgraph/datasources/counter.gql.json

@@ -4,14 +4,23 @@
     "fields": [
       { "name": "id", "type": "Bytes!" },
       { "name": "asCounter", "type": "CounterContract" },
-      { "name": "CounterIncrementedEvent", "type": "CounterIncremented!" }
+      {
+        "name": "CounterIncrementedEvents",
+        "type": "CounterIncremented!",
+        "derived": "emitter"
+      }
     ]
   },
   {
     "name": "CounterContract",
     "fields": [
       { "name": "asAccount", "type": "Account!" },
-      { "name": "currentValue", "type": "BigInt!" }
+      { "name": "currentValue", "type": "BigInt!" },
+      {
+        "name": "CounterIncrementedEvent",
+        "type": "CounterIncremented!",
+        "derived": "contract"
+      }
     ]
   },
   {
@@ -26,4 +35,4 @@
       { "name": "currentValue", "type": "BigInt!" }
     ]
   }
-]
+]

subgraph/fetch/counter.ts

@@ -1,6 +1,6 @@
-import { Address } from "@graphprotocol/graph-ts";
-import { CounterContract } from "../../generated/schema";
-import { fetchAccount } from "./account";
+import { Address, BigInt } from '@graphprotocol/graph-ts';
+import { CounterContract } from '../../generated/schema';
+import { fetchAccount } from './account';
 
 export function fetchCounter(address: Address): CounterContract {
   const account = fetchAccount(address);
@@ -10,10 +10,11 @@ export function fetchCounter(address: Address): CounterContract {
     contract = new CounterContract(account.id.toHex());
     contract.asAccount = account.id;
     account.asCounter = contract.id;
+    contract.currentValue = BigInt.fromString('0');
 
     contract.save();
     account.save();
   }
 
   return contract as CounterContract;
-}
+}