fix DATABASE_URL config in phoenix

backend/Dockerfile

@@ -16,9 +16,9 @@ ENV MIX_ENV=prod
 
 # install mix dependencies
 COPY mix.exs mix.lock ./
-COPY config config
 RUN mix deps.get
 RUN mix deps.compile
+COPY config config
 
 # build assets
 # COPY assets assets

backend/config/releases.exs

@@ -3,17 +3,16 @@
 
 import Config
 
-# For production, don't forget to configure the url host
+ssl =
-# to something meaningful, Phoenix uses this information
+  case System.get_env("MIX_ENV") do
-# when generating URLs.
+    "prod" -> true
+    _ -> false
+  end
+
 config :backend, Backend.Repo,
-  # username: System.get_env("POSTGRES_USER"),
+  url: System.get_env("DATABASE_URL"),
-  # password: System.get_env("POSTGRES_PASSWORD"),
-  # database: System.get_env("POSTGRES_DB"),
-  # hostname: System.get_env("POSTGRES_HOSTNAME"),
-  url: System.get_env("ecto://" <> "DATABASE_URL"),
   pool_size: String.to_integer(System.get_env("POOL_SIZE") || "10"),
-  ssl: true
+  ssl: ssl
 
 # show_sensitive_data_on_connection_error: true
 

backend/lib/backend/crawler/crawlers/mastodon.ex

@@ -1,6 +1,7 @@
 defmodule Backend.Crawler.Crawlers.Mastodon do
   require Logger
   import Backend.Crawler.Util
+  import Backend.Util
   alias Backend.Crawler.ApiCrawler
 
   @behaviour ApiCrawler

backend/lib/backend/repo.ex

@@ -2,4 +2,8 @@ defmodule Backend.Repo do
   use Ecto.Repo,
     otp_app: :backend,
     adapter: Ecto.Adapters.Postgres
+
+  def init(_type, config) do
+    {:ok, Keyword.put(config, :url, System.get_env("DATABASE_URL"))}
+  end
 end

docker-compose.production.yml

@@ -1,28 +0,0 @@
-version: "3"
-services:
-  db:
-    restart: always
-    networks:
-      - database_network
-  phoenix:
-    restart: always
-    build: ./backend
-    networks:
-      - database_network
-    depends_on:
-      - db
-    ports:
-      - "${PORT}:${PORT}"
-    environment:
-      - DATABASE_URL
-      - SECRET_KEY_BASE
-      - PORT
-      - BACKEND_HOSTNAME
-  gephi:
-    networks:
-      - database_network
-    depends_on:
-      - db
-networks:
-  database_network:
-    driver: bridge