feat: CartRegion link, definition + workflow (#6392)

packages/core-flows/src/definition/cart/steps/find-one-or-any-region.ts

@@ -0,0 +1,27 @@
+import { ModuleRegistrationName } from "@medusajs/modules-sdk"
+import { IRegionModuleService } from "@medusajs/types"
+import { StepResponse, createStep } from "@medusajs/workflows-sdk"
+
+export const findOneOrAnyRegionStepId = "find-one-or-any-region"
+export const findOneOrAnyRegionStep = createStep(
+  findOneOrAnyRegionStepId,
+  async (data: { regionId?: string }, { container }) => {
+    const service = container.resolve<IRegionModuleService>(
+      ModuleRegistrationName.REGION
+    )
+
+    if (!data.regionId) {
+      const regions = await service.list({})
+
+      if (!regions?.length) {
+        throw Error("No regions found")
+      }
+
+      return new StepResponse(regions[0])
+    }
+
+    const region = await service.retrieve(data.regionId)
+
+    return new StepResponse(region)
+  }
+)

packages/core-flows/src/definition/cart/steps/index.ts

@@ -1,3 +1,4 @@
 export * from "./create-carts"
+export * from "./find-one-or-any-region"
 export * from "./update-carts"
 

packages/core-flows/src/definition/cart/workflows/create-carts.ts

@@ -1,13 +1,31 @@
-import { CartDTO, CreateCartDTO } from "@medusajs/types"
-import { WorkflowData, createWorkflow } from "@medusajs/workflows-sdk"
-import { createCartsStep } from "../steps"
+import { CartDTO, CreateCartWorkflowInputDTO } from "@medusajs/types"
+import {
+  WorkflowData,
+  createWorkflow,
+  transform,
+} from "@medusajs/workflows-sdk"
+import { createCartsStep, findOneOrAnyRegionStep } from "../steps"
 
-type WorkflowInput = { cartData: CreateCartDTO[] }
+type WorkflowInput = CreateCartWorkflowInputDTO
 
-export const createCartsWorkflowId = "create-carts"
-export const createCartsWorkflow = createWorkflow(
-  createCartsWorkflowId,
+export const createCartWorkflowId = "create-cart"
+export const createCartWorkflow = createWorkflow(
+  createCartWorkflowId,
   (input: WorkflowData<WorkflowInput>): WorkflowData<CartDTO[]> => {
-    return createCartsStep(input.cartData)
+    const region = findOneOrAnyRegionStep({
+      regionId: input.region_id,
+    })
+
+    const cartInput = transform({ input, region }, (data) => {
+      return {
+        ...data.input,
+        currency_code: data?.input.currency_code || data.region.currency_code,
+        region_id: data.region.id,
+      }
+    })
+
+    const cart = createCartsStep([cartInput])
+
+    return cart
   }
 )