Add docker-compose and .env

examples/postgres/mockable-todos/.env.example

@@ -0,0 +1 @@
+DATABASE_URL="postgres://postgres:password@localhost/todos"

examples/postgres/mockable-todos/README.md

@@ -6,19 +6,27 @@ This example is based on the ideas in [this blog post](https://medium.com/better
 
 ## Setup
 
-1. Declare the database URL
+1. Run `docker-compose up -d` to run Postgres in the background.
+
+2. Declare the database URL, either by exporting it:
 
     ```
     export DATABASE_URL="postgres://postgres:password@localhost/todos"
     ```
 
-2. Create the database.
+    or by making a `.env` file:
+
+    ```
+    cp .env.example .env
+    ```
+
+3. Create the database.
 
     ```
     $ sqlx db create
     ```
 
-3. Run sql migrations
+4. Run sql migrations
 
     ```
     $ sqlx migrate run
@@ -43,3 +51,11 @@ List all todos
 ```
 cargo run
 ```
+
+## Cleanup
+
+To destroy the Postgres database, run:
+
+```
+docker-compose down --volumes
+```

examples/postgres/mockable-todos/docker-compose.yml

@@ -0,0 +1,17 @@
+version: "3"
+
+services:
+  database:
+    image: "postgres"
+    ports:
+      - "5432:5432"
+    restart: always
+    environment:
+      - POSTGRES_USER=postgres
+      - POSTGRES_PASSWORD=password
+      - POSTGRES_DB=todos
+    volumes:
+      - database_data:/var/lib/postgresql/data
+volumes:
+  database_data:
+    driver: local

examples/postgres/mockable-todos/src/main.rs

@@ -1,4 +1,5 @@
 use async_trait::async_trait;
+use dotenv;
 use sqlx::postgres::PgPool;
 use sqlx::Done;
 use std::{env, io::Write, sync::Arc};
@@ -19,6 +20,7 @@ enum Command {
 #[async_std::main]
 #[paw::main]
 async fn main(args: Args) -> anyhow::Result<()> {
+    dotenv::dotenv().ok();
     let pool = PgPool::connect(&env::var("DATABASE_URL")?).await?;
     let todo_repo = PostgresTodoRepo::new(pool);
     let mut writer = std::io::stdout();