Rework & type relations

api/src/models/utils/index.ts

@@ -9,3 +9,4 @@ export * from "./sort";
 export * from "./keyset-paginate";
 export * from "./db-metadata";
 export * from "./original";
+export * from "./relations";

api/src/models/utils/relations.ts

@@ -0,0 +1,26 @@
+import { type SQL, type Subquery, sql } from "drizzle-orm";
+import type { SelectResultField } from "drizzle-orm/query-builders/select.types";
+
+export const buildRelations = <
+	R extends string,
+	P extends object,
+	Rel extends Record<R, (languages: P) => Subquery>,
+>(
+	enabled: R[],
+	relations: Rel,
+	params: P,
+) => {
+	// we wrap that in a sql`` instead of using the builder because of this issue
+	// https://github.com/drizzle-team/drizzle-orm/pull/1674
+	return Object.fromEntries(
+		enabled.map((x) => [x, sql`${relations[x](params)}`]),
+	) as {
+		[P in R]?: SQL<
+			ReturnType<Rel[P]>["_"]["selectedFields"] extends {
+				[key: string]: infer TValue;
+			}
+				? SelectResultField<TValue>
+				: never
+		>;
+	};
+};