work on implementing

backend/src/graphql/models/Transaction.ts

@@ -10,18 +10,22 @@ import { Decay } from './Decay'
 
 @ObjectType()
 export class Transaction {
-  constructor(json: any) {
-    this.type = json.type
-    this.balance = Number(json.balance)
-    this.decayStart = json.decay_start
-    this.decayEnd = json.decay_end
-    this.decayDuration = json.decay_duration
-    this.memo = json.memo
-    this.transactionId = json.transaction_id
-    this.name = json.name
-    this.email = json.email
-    this.date = json.date
-    this.decay = json.decay ? new Decay(json.decay) : undefined
+  constructor()
+  constructor(json: any)
+  constructor(json?: any) {
+    if(json) {
+      this.type = json.type
+      this.balance = Number(json.balance)
+      this.decayStart = json.decay_start
+      this.decayEnd = json.decay_end
+      this.decayDuration = json.decay_duration
+      this.memo = json.memo
+      this.transactionId = json.transaction_id
+      this.name = json.name
+      this.email = json.email
+      this.date = json.date
+      this.decay = json.decay ? new Decay(json.decay) : undefined
+    } 
   }
 
   @Field(() => String)

backend/src/graphql/resolvers/listTransactions.ts

@@ -1,16 +1,64 @@
 import { User as dbUser } from '../../typeorm/entity/User'
 import { TransactionList, Transaction } from '../models/Transaction'
-import { UserTransaction } from '../../typeorm/entity/UserTransaction'
+import { UserTransaction as dbUserTransaction } from '../../typeorm/entity/UserTransaction'
+import { Transaction as dbTransaction } from '../../typeorm/entity/Transaction'
+import { TransactionSendCoin as dbTransactionSendCoin} from '../../typeorm/entity/TransactionSendCoin'
+import { TransactionCreation as dbTransactionCreation} from '../../typeorm/entity/TransactionCreation'
+import calculateDecay from '../../util/decay'
+import { roundFloorFrom4 } from '../../util/round'
 
-function calculateAndAddDecayTransactions(
-  userTransactions: UserTransaction[],
+async function calculateAndAddDecayTransactions(
+  userTransactions: dbUserTransaction[],
   user: dbUser,
   decay: boolean,
   skipFirstTransaction: boolean,
-): Transaction[] {
-  const transactions: Transaction[] = []
+): Promise<Transaction[]> {
+  let finalTransactions: Transaction[] = []
+  let transactionIds: number[] = []
+  let involvedUserIds: number[] = []
 
-  return transactions
+  userTransactions.forEach((userTransaction: dbUserTransaction) => {
+    transactionIds.push(userTransaction.transactionId)
+    involvedUserIds.push(userTransaction.userId)
+  })
+  // remove duplicates
+  // https://stackoverflow.com/questions/1960473/get-all-unique-values-in-a-javascript-array-remove-duplicates
+  const involvedUsersUnique = involvedUserIds.filter((v, i, a) => a.indexOf(v) === i)
+  const userIndiced = dbUser.getUsersIndiced(involvedUsersUnique)
+
+  const transactions = await dbTransaction
+      .createQueryBuilder('transaction')
+      .where('transaction.id IN (:...transactions)', { transactions: transactionIds})
+      .leftJoinAndSelect('transaction.sendCoin', 'transactionSendCoin', 'transactionSendCoin.transactionid = transaction.id')
+      .leftJoinAndSelect('transaction.creation', 'transactionCreation', 'transactionSendCoin.transactionid = transaction.id')
+      .getMany()
+  
+  let transactionIndiced: dbTransaction[] = []
+  transactions.forEach((transaction: dbTransaction) => {
+    transactionIndiced[transaction.id] = transaction
+  })  
+
+  const decayStartTransaction = await dbTransaction.createQueryBuilder('transaction')
+      .where('transaction.transactionTypeId = :transactionTypeId', { transactionTypeId: 9})
+      .orderBy('received', 'ASC')
+      .getOne()
+  
+  userTransactions.forEach((userTransaction: dbUserTransaction, i:number) => {
+    const transaction = transactionIndiced[userTransaction.transactionId]
+    let finalTransaction = new Transaction
+    finalTransaction.transactionId = transaction.id 
+    finalTransaction.date = transaction.received.toString()
+    finalTransaction.memo = transaction.memo
+
+    let prev = i > 0 ? userTransactions[i-1] : null
+    if(prev && prev.balance > 0) {
+      
+    }
+
+  })
+
+
+  return finalTransactions
 }
 
 export default async function listTransactions(

backend/src/typeorm/entity/Transaction.ts

@@ -20,4 +20,11 @@ export class Transaction extends BaseEntity {
   @Column({ name: 'blockchain_type_id' })
   blockchainTypeId: number
 
+  static async findByTransactionTypeId(transactionTypeId: number): Promise<Transaction[]> {
+    return this.createQueryBuilder('transaction')
+      .where('transaction.transactionTypeId = :transactionTypeId', { transactionTypeId: transactionTypeId})
+      .getMany()
+  }
+
+
 }

backend/src/typeorm/entity/User.ts

@@ -32,4 +32,16 @@ export class User extends BaseEntity {
       .where('hex(user.pubkey) = :pubkeyHex', { pubkeyHex })
       .getOneOrFail()
   }
+
+  static async getUsersIndiced(userIds: number[]): Promise<User[]> {
+    const users = await this.createQueryBuilder('user')
+      .select(['user.id', 'user.firstName', 'user.lastName', 'user.email'])
+      .where('user.id IN (:...users)', { users: userIds})
+      .getMany()
+    let usersIndiced: User[] = []
+    users.forEach((value,  index) => {
+      usersIndiced[index] = value
+    }) 
+    return usersIndiced
+  }
 }