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<h1 id="getting-started"><a class="header" href="#getting-started">Getting started</a></h1>
<p>This crate provides the <code>#[ergol]</code> macro. You can use it by adding</p>
<pre><code class="language-toml">ergol = "0.1"
</code></pre>
<p>to your dependencies.</p>
<p>It allows to persist the data in a database. For example, you just have to
write</p>
<pre><pre class="playground"><code class="language-rust edition2018"><span class="boring">#![allow(unused)]
</span><span class="boring">fn main() {
</span><span class="boring">extern crate ergol;
</span>use ergol::prelude::*;
#[ergol]
pub struct User {
#[id] pub id: i32,
#[unique] pub username: String,
pub password: String,
pub age: Option<i32>,
}
<span class="boring">}</span></code></pre></pre>
<p>and the <code>#[ergol]</code> macro will generate most of the code you will need. You'll
then be able to run code like the following:</p>
<pre><pre class="playground"><code class="language-rust edition2018"><span class="boring">extern crate tokio;
</span><span class="boring">extern crate ergol;
</span><span class="boring">use ergol::prelude::*;
</span><span class="boring">#[ergol]
</span><span class="boring">pub struct User {
</span><span class="boring"> #[id] pub id: i32,
</span><span class="boring"> #[unique] pub username: String,
</span><span class="boring"> pub password: String,
</span><span class="boring"> pub age: Option<i32>,
</span><span class="boring">}
</span><span class="boring">#[tokio::main]
</span><span class="boring">async fn main() -> Result<(), ergol::tokio_postgres::Error> {
</span><span class="boring"> let (db, connection) = ergol::connect(
</span><span class="boring"> "host=localhost user=ergol password=ergol dbname=ergol",
</span><span class="boring"> ergol::tokio_postgres::NoTls,
</span><span class="boring"> )
</span><span class="boring"> .await?;
</span><span class="boring"> tokio::spawn(async move {
</span><span class="boring"> if let Err(e) = connection.await {
</span><span class="boring"> eprintln!("connection error: {}", e);
</span><span class="boring"> }
</span><span class="boring"> });
</span>// Drop the user table if it exists
User::drop_table().execute(&db).await.ok();
// Create the user table
User::create_table().execute(&db).await?;
// Create a user and save it into the database
let mut user: User = User::create("thomas", "pa$$w0rd", Some(28)).save(&db).await?;
// Change some of its fields
*user.age.as_mut().unwrap() += 1;
// Update the user in the database
user.save(&db).await?;
// Fetch a user by its username thanks to the unique attribute
let user: Option<User> = User::get_by_username("thomas", &db).await?;
// Select all users
let users: Vec<User> = User::select().execute(&db).await?;
<span class="boring">Ok(())
</span><span class="boring">}</span></code></pre></pre>
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