CZK implemented

src/initializers/currency_seeder.rs

@@ -0,0 +1,50 @@
+//! Ensures the built-in alternative display currencies always exist.
+//!
+//! EUR is the base currency and is never stored. For now the only alternative is
+//! the Czech koruna (CZK); the admin sets its exchange rate and can disable it.
+//! We insert each one only when its `code` is missing, so an admin's rate/enabled
+//! changes are never overwritten on the next boot.
+
+use async_trait::async_trait;
+use loco_rs::prelude::*;
+use sea_orm::{ActiveModelTrait, ColumnTrait, EntityTrait, PaginatorTrait, QueryFilter, Set};
+
+use crate::models::currencies;
+use crate::shared::currency::SCALE;
+
+/// `(code, symbol, default_rate_e4)` — default rate is a placeholder the admin
+/// is expected to update from the live FX rate.
+const BUILTINS: [(&str, &str, i64); 1] = [("CZK", "Kč", 25 * SCALE)];
+
+pub struct CurrencySeeder;
+
+#[async_trait]
+impl Initializer for CurrencySeeder {
+    fn name(&self) -> String {
+        "currency-seeder".to_string()
+    }
+
+    async fn before_run(&self, ctx: &AppContext) -> Result<()> {
+        for (code, symbol, rate_e4) in BUILTINS {
+            let exists = currencies::Entity::find()
+                .filter(currencies::Column::Code.eq(code))
+                .count(&ctx.db)
+                .await?
+                > 0;
+            if exists {
+                continue;
+            }
+            currencies::ActiveModel {
+                code: Set(code.to_string()),
+                symbol: Set(symbol.to_string()),
+                rate_e4: Set(rate_e4),
+                enabled: Set(true),
+                ..Default::default()
+            }
+            .insert(&ctx.db)
+            .await?;
+            tracing::info!(currency = code, "seeded display currency");
+        }
+        Ok(())
+    }
+}