implement changes to commands and templates

commands/db/test.js

@@ -14,6 +14,12 @@ module.exports = {
     async execute(interaction) {
         const dbClient = await connectToDatabase();
         const message = interaction.options.getString('message');
+        if (message.length > 500) {
+            return interaction.reply({
+                content: 'Message must be 500 characters or fewer.',
+                ephemeral: true,
+            });
+        }
         const db = dbClient.db('discord');
         const collection = db.collection('test');
         await collection.insertOne({ userId: interaction.user.id, message: message });

commands/db/transfer.js

@@ -40,22 +40,21 @@ module.exports = {
         }
 
         const senderId = interaction.user.id;
-        const senderData = await collection.findOne({ userID: senderId });
-        const senderBalance = senderData?.balance ?? 0;
+        const debitResult = await collection.findOneAndUpdate(
+            { userID: senderId, balance: { $gte: amount } },
+            { $inc: { balance: -amount } },
+            { returnDocument: 'after' }
+        );
 
-        if (senderBalance < amount) {
+        if (!debitResult.value) {
+            const senderData = await collection.findOne({ userID: senderId });
+            const senderBalance = senderData?.balance ?? 0;
             return interaction.reply({
                 content: `You only have **${senderBalance}** coins available.`,
                 ephemeral: true,
             });
         }
 
-        await collection.updateOne(
-            { userID: senderId },
-            { $inc: { balance: -amount } },
-            { upsert: true }
-        );
-
         await collection.updateOne(
             { userID: target.id },
             { $inc: { balance: amount } },