refactor(backend): allow to set selected badge-slot to null (#8421)

* allow to set selected badgeslot to null

Free a specific badge slot by setting it to null

* Update backend/src/schema/resolvers/users.ts

Co-authored-by: Wolfgang Huß <wolle.huss@pjannto.com>

---------

Co-authored-by: Wolfgang Huß <wolle.huss@pjannto.com>
Co-authored-by: Max <maxharz@gmail.com>

backend/src/graphql/types/type/User.gql

@@ -252,6 +252,6 @@ type Mutation {
   # Get a JWT Token for the given Email and password
   login(email: String!, password: String!): String!
 
-  setTrophyBadgeSelected(slot: Int!, badgeId: ID!): User
+  setTrophyBadgeSelected(slot: Int!, badgeId: ID): User
   resetTrophyBadgesSelected: User
 }

backend/src/schema/resolvers/users.spec.ts

@@ -76,7 +76,7 @@ const updateOnlineStatus = gql`
 `
 
 const setTrophyBadgeSelected = gql`
-  mutation ($slot: Int!, $badgeId: ID!) {
+  mutation ($slot: Int!, $badgeId: ID) {
     setTrophyBadgeSelected(slot: $slot, badgeId: $badgeId) {
       badgeTrophiesCount
       badgeTrophiesSelected {
@@ -1294,6 +1294,53 @@ describe('setTrophyBadgeSelected', () => {
         }),
       )
     })
+
+    describe('set badge to null', () => {
+      it('returns the user with no badge set on the selected slot', async () => {
+        await mutate({
+          mutation: setTrophyBadgeSelected,
+          variables: { slot: 0, badgeId: 'trophy_bear' },
+        })
+        await mutate({
+          mutation: setTrophyBadgeSelected,
+          variables: { slot: 5, badgeId: 'trophy_panda' },
+        })
+
+        await expect(
+          mutate({
+            mutation: setTrophyBadgeSelected,
+            variables: { slot: 5, badgeId: null },
+          }),
+        ).resolves.toEqual(
+          expect.objectContaining({
+            data: {
+              setTrophyBadgeSelected: {
+                badgeTrophiesCount: 2,
+                badgeTrophiesSelected: [
+                  {
+                    id: 'trophy_bear',
+                  },
+                  null,
+                  null,
+                  null,
+                  null,
+                  null,
+                  null,
+                  null,
+                  null,
+                ],
+                badgeTrophiesUnused: [
+                  {
+                    id: 'trophy_panda',
+                  },
+                ],
+                badgeTrophiesUnusedCount: 1,
+              },
+            },
+          }),
+        )
+      })
+    })
   })
 })
 

backend/src/schema/resolvers/users.ts

@@ -404,17 +404,25 @@ export default {
       const session = context.driver.session()
 
       const query = session.writeTransaction(async (transaction) => {
-        const result = await transaction.run(
-          `
+        const queryBadge = `
             MATCH (user:User {id: $userId})<-[:REWARDED]-(badge:Badge {id: $badgeId})
             OPTIONAL MATCH (user)-[badgeRelation:SELECTED]->(badge)
             OPTIONAL MATCH (user)-[slotRelation:SELECTED{slot: $slot}]->(:Badge)
             DELETE badgeRelation, slotRelation
             MERGE (user)-[:SELECTED{slot: toInteger($slot)}]->(badge)
             RETURN user {.*}
-          `,
-          { userId, badgeId, slot },
-        )
+          `
+        const queryNull = `
+            MATCH (user:User {id: $userId})
+            OPTIONAL MATCH (user)-[slotRelation:SELECTED {slot: $slot}]->(:Badge)
+            DELETE slotRelation
+            RETURN user {.*}
+          `
+        const result = await transaction.run(badgeId ? queryBadge : queryNull, {
+          userId,
+          badgeId,
+          slot,
+        })
         return result.records.map((record) => record.get('user'))[0]
       })
       try {