The docker-compose.yml file is added

.dockerignore

@@ -0,0 +1 @@
+node_modules

Dockerfile

@@ -12,4 +12,4 @@ COPY . .
 
 EXPOSE 4000
 
-CMD ["npm", "start"]
+CMD ["npm", "run", "dev"]

docker-compose.yml

@@ -0,0 +1,20 @@
+version: "3"
+
+services: 
+    api: 
+        container_name: pizzapp_back
+        restart: always
+        build: .
+        ports:
+            - "3001:4000"
+        links: 
+            - mongo
+        volumes: 
+            - .:/usr/src/app
+    mongo: 
+        container_name: pizzapp_database
+        image: mongo
+        ports: 
+            - "27018:27017"
+        logging: 
+            driver: none

src/database.js

@@ -1,12 +1,17 @@
 const mongoose = require("mongoose");
 
+const DB =
+  process.env.NODE_ENV === "development"
+    ? process.env.DATABASE_DOCKER
+    : process.env.DATABASE;
+
 mongoose
-  .connect(process.env.DATABASE, {
+  .connect(DB, {
     useNewUrlParser: true,
     useUnifiedTopology: true,
     useFindAndModify: true,
   })
-  .then(db => console.log("db is connected"))
+  .then(db => console.log("db is connected to", db.connection.name))
   .catch(err => {
     console.error(err);
     console.error("database connection failed");