full backend rewrite.

calling this v0.4.0

backend/src/repo/channel_repo.rs

@@ -0,0 +1,39 @@
+use crate::repo::ChannelRepo;
+use crate::model::space::Channel;
+use sqlx::PgPool;
+
+#[derive(Clone)]
+pub struct ChannelRepository {
+    pool: PgPool,
+}
+
+impl ChannelRepository {
+    pub fn new(pool: PgPool) -> Self {
+        Self { pool }
+    }
+}
+
+#[rocket::async_trait]
+impl ChannelRepo for ChannelRepository {
+    async fn create(&self, name: &str, description: Option<&str>, space_id: i64) -> Result<i64, sqlx::Error> {
+        let row = sqlx::query!(
+            "INSERT INTO channels (name, description, space_id) VALUES ($1, $2, $3) RETURNING id",
+            name,
+            description,
+            space_id
+        )
+        .fetch_one(&self.pool)
+        .await?;
+        Ok(row.id)
+    }
+
+    async fn get_by_space_id(&self, space_id: i64) -> Result<Vec<Channel>, sqlx::Error> {
+        sqlx::query_as!(
+            Channel,
+            "SELECT id, name, description, space_id, created_at as \"created_at!\", updated_at as \"updated_at!\" FROM channels WHERE space_id = $1",
+            space_id
+        )
+        .fetch_all(&self.pool)
+        .await
+    }
+}