From 60ccdc5beb194ae771ae7606562b60de74aced6d Mon Sep 17 00:00:00 2001
From: Moriz Wahl <moriz.wahl@gmx.de>
Date: Mon, 3 Apr 2023 12:54:11 +0200
Subject: [PATCH] feat(backend): previuos balance in transaction

---
 backend/src/graphql/model/Transaction.ts            | 11 ++++++++++-
 backend/src/graphql/resolver/TransactionResolver.ts |  5 +++--
 2 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/backend/src/graphql/model/Transaction.ts b/backend/src/graphql/model/Transaction.ts
index 1b857391b..dc20a5c83 100644
--- a/backend/src/graphql/model/Transaction.ts
+++ b/backend/src/graphql/model/Transaction.ts
@@ -9,7 +9,12 @@ import { User } from './User'
 
 @ObjectType()
 export class Transaction {
-  constructor(transaction: dbTransaction, user: User, linkedUser: User | null = null) {
+  constructor(
+    transaction: dbTransaction,
+    user: User,
+    linkedUser: User | null = null,
+    previuosBalance: Decimal = new Decimal(0),
+  ) {
     this.id = transaction.id
     this.user = user
     this.previous = transaction.previous
@@ -47,6 +52,7 @@ export class Transaction {
     this.linkId = transaction.contribution
       ? transaction.contribution.contributionLinkId
       : transaction.transactionLinkId || null
+    this.previousBalance = previuosBalance
   }
 
   @Field(() => Int)
@@ -70,6 +76,9 @@ export class Transaction {
   @Field(() => Date)
   balanceDate: Date
 
+  @Field(() => Decimal)
+  previousBalance: Decimal
+
   @Field(() => Decay)
   decay: Decay
 
diff --git a/backend/src/graphql/resolver/TransactionResolver.ts b/backend/src/graphql/resolver/TransactionResolver.ts
index 430cdb363..8c51c6681 100644
--- a/backend/src/graphql/resolver/TransactionResolver.ts
+++ b/backend/src/graphql/resolver/TransactionResolver.ts
@@ -283,12 +283,13 @@ export class TransactionResolver {
     }
 
     // transactions
-    userTransactions.forEach((userTransaction) => {
+    userTransactions.forEach((userTransaction, idx) => {
       const linkedUser =
         userTransaction.typeId === TransactionTypeId.CREATION
           ? communityUser
           : involvedUsers.find((u) => u.id === userTransaction.linkedUserId)
-      transactions.push(new Transaction(userTransaction, self, linkedUser))
+      const previousBalance = idx ? userTransactions[idx - 1].balance : new Decimal(0)
+      transactions.push(new Transaction(userTransaction, self, linkedUser, previousBalance))
     })
     logger.debug(`TransactionTypeId.CREATION: transactions=${transactions}`)