feat: Implements common database interactions as dependencies.

Sources/App/Controllers/Api/PurchaseOrderApiController.swift

@@ -1,10 +1,12 @@
+import Dependencies
 import Fluent
 import Vapor
 
 // TODO: Add update route.
 
 struct PurchaseOrderApiController: RouteCollection {
-  private let purchaseOrders = PurchaseOrderDB()
+
+  @Dependency(\.purchaseOrders) var purchaseOrders
 
   func boot(routes: any RoutesBuilder) throws {
     let protected = routes.apiProtected(route: "purchase-orders")
@@ -18,7 +20,7 @@ struct PurchaseOrderApiController: RouteCollection {
 
   @Sendable
   func index(req: Request) async throws -> [PurchaseOrder.DTO] {
-    try await purchaseOrders.fetchAll(on: req.db)
+    try await purchaseOrders.fetchAll()
   }
 
   @Sendable
@@ -27,15 +29,14 @@ struct PurchaseOrderApiController: RouteCollection {
     let model = try req.content.decode(PurchaseOrder.Create.self)
     return try await purchaseOrders.create(
       model,
-      createdById: req.auth.require(User.self).requireID(),
-      on: req.db
+      req.auth.require(User.self).requireID()
     )
   }
 
   @Sendable
   func get(req: Request) async throws -> PurchaseOrder.DTO {
     guard let id = req.parameters.get("id", as: PurchaseOrder.IDValue.self),
-          let purchaseOrder = try await purchaseOrders.get(id: id, on: req.db)
+          let purchaseOrder = try await purchaseOrders.get(id)
     else {
       throw Abort(.notFound)
     }
@@ -47,7 +48,7 @@ struct PurchaseOrderApiController: RouteCollection {
     guard let id = req.parameters.get("id", as: PurchaseOrder.IDValue.self) else {
       throw Abort(.badRequest, reason: "Purchase order id not provided.")
     }
-    try await purchaseOrders.delete(id: id, on: req.db)
+    try await purchaseOrders.delete(id)
     return .ok
   }