Remove concurrency

cmd/web/handlers.go

@@ -92,7 +92,11 @@ func (app *application) CreateElection(w http.ResponseWriter, r *http.Request) {
 			randomIdentity := randomVoterIdentity()
 			voterIdentities = append(voterIdentities, randomIdentity)
 		}
-		go app.voters.InsertMultiple(voterIdentities, electionId)
+		_, err = app.voters.InsertMultiple(voterIdentities, electionId)
+		if err != nil {
+			app.serverError(w, r, err)
+			return
+		}
 
 		res, err = json.Marshal(api.CreateElectionResponse{VoterIdentities: &voterIdentities})
 		if err != nil {
@@ -192,6 +196,7 @@ func (app *application) CreateVotes(w http.ResponseWriter, r *http.Request, id i
 		_, err := app.votes.Insert(voterIdentity, election.ID, c.ChoiceText, c.Tokens)
 		if err != nil {
 			app.serverError(w, r, err)
+			return
 		}
 	}