Update resolver to match one Donations node

- there should only ever be one Donations node to start off with, if
that changes in the future for some reason, then we'd need to look into
changing the match to something that makes more sense.

backend/src/schema/resolvers/donations.js

@@ -1,13 +1,18 @@
+import uuid from 'uuid/v4'
+
 export default {
   Mutation: {
     UpdateDonations: async (_parent, params, context, _resolveInfo) => {
       const { driver } = context
       const session = driver.session()
       let donations
+      params.id = params.id || uuid()
+
       const writeTxResultPromise = session.writeTransaction(async txc => {
         const updateDonationsTransactionResponse = await txc.run(
           ` 
-            MATCH (donations:Donations {id: $params.id})
+            MATCH (donations:Donations)
+            WITH donations LIMIT 1
             SET donations += $params
             SET donations.updatedAt = toString(datetime())
             RETURN donations

backend/src/schema/resolvers/donations.spec.js

@@ -10,8 +10,8 @@ const instance = getNeode()
 const driver = getDriver()
 
 const updateDonationsMutation = gql`
-  mutation($id: ID!, $goal: Int, $progress: Int) {
-    UpdateDonations(id: $id, goal: $goal, progress: $progress) {
+  mutation($goal: Int, $progress: Int) {
+    UpdateDonations(goal: $goal, progress: $progress) {
       goal
       progress
       createdAt
@@ -48,7 +48,7 @@ describe('donations', () => {
 
   beforeEach(async () => {
     variables = {}
-    newlyCreatedDonations = await factory.create('Donations', { id: 'total-donations' })
+    newlyCreatedDonations = await factory.create('Donations')
   })
 
   afterEach(async () => {
@@ -84,7 +84,7 @@ describe('donations', () => {
 
   describe('update donations', () => {
     beforeEach(() => {
-      variables = { id: 'total-donations', goal: 20000, progress: 3000 }
+      variables = { goal: 20000, progress: 3000 }
     })
 
     describe('unauthenticated', () => {

backend/src/schema/types/type/Donations.gql

@@ -1,4 +1,5 @@
 type Donations {
+  id: ID!
   goal: Int!
   progress: Int!
   createdAt: String
@@ -10,5 +11,5 @@ type Query {
 }
 
 type Mutation {
-  UpdateDonations(id: ID!, goal: Int, progress: Int): Donations
+  UpdateDonations(goal: Int, progress: Int): Donations
 }