fix(medusa,dashboard): don't send price updates for deleted regions/currencies (#9361)

**What**
- Fixes an issue where the admin dashboard would send region prices for deleted regions.
- Also, includes the implementation for `GET /admin/shipping-options/:id` and its corresponding SDK function.

**Why**
- When a region price for a deleted region was sent to the backend it would result in the insert hitting a not null constraint on the currency_code for prices. To avoid this the dashboard should not send region prices for deleted regions. 

**Additional context**
- Prices for deleted regions should ideally not be returned when fetching shipping option prices. However, we don't yet have a mechanism for cleaning up region prices after a region is deleted.

Fixes CC-540

packages/admin/dashboard/src/hooks/api/shipping-options.tsx

@@ -18,24 +18,24 @@ export const shippingOptionsQueryKeys = queryKeysFactory(
   SHIPPING_OPTIONS_QUERY_KEY
 )
 
-// TODO: Endpoint is not implemented yet
-// export const useShippingOption = (
-//   id: string,
-//   options?: UseQueryOptions<
-//     HttpTypes.AdminShippingOptionResponse,
-//     Error,
-//     HttpTypes.AdminShippingOptionResponse,
-//     QueryKey
-//   >
-// ) => {
-//   const { data, ...rest } = useQuery({
-//     queryFn: () => sdk.admin.shippingOption.retrieve(id),
-//     queryKey: shippingOptionsQueryKeys.retrieve(id),
-//     ...options,
-//   })
+export const useShippingOption = (
+  id: string,
+  query?: Record<string, any>,
+  options?: UseQueryOptions<
+    HttpTypes.AdminShippingOptionResponse,
+    Error,
+    HttpTypes.AdminShippingOptionResponse,
+    QueryKey
+  >
+) => {
+  const { data, ...rest } = useQuery({
+    queryFn: () => sdk.admin.shippingOption.retrieve(id, query),
+    queryKey: shippingOptionsQueryKeys.detail(id),
+    ...options,
+  })
 
-//   return { ...data, ...rest }
-// }
+  return { ...data, ...rest }
+}
 
 export const useShippingOptions = (
   query?: HttpTypes.AdminShippingOptionListParams,

packages/admin/dashboard/src/routes/locations/location-service-zone-shipping-option-pricing/components/create-shipping-options-form/edit-shipping-options-pricing-form.tsx

@@ -129,6 +129,11 @@ export function EditShippingOptionsPricingForm({
           return undefined
         }
 
+        const currencyExists = currencies.some(currencyCode => currencyCode.toLowerCase() == code.toLowerCase())
+        if (!currencyExists) {
+          return undefined
+        }
+
         const amount = castNumber(value)
 
         const priceRecord: PriceRecord = {
@@ -155,6 +160,14 @@ export function EditShippingOptionsPricingForm({
           return undefined
         }
 
+        // Check if the region_id exists in the regions array to avoid
+        // sending updates of region prices where the region has been
+        // deleted 
+        const regionExists = regions?.some(region => region.id === region_id)
+        if (!regionExists) {
+          return undefined
+        }
+
         const amount = castNumber(value)
 
         const priceRecord: PriceRecord = {

packages/admin/dashboard/src/routes/locations/location-service-zone-shipping-option-pricing/location-service-zone-shipping-option-pricing.tsx

@@ -1,25 +1,24 @@
 import { json, useParams } from "react-router-dom"
 
 import { RouteFocusModal } from "../../../components/modals"
-import { useShippingOptions } from "../../../hooks/api/shipping-options"
+import { useShippingOption } from "../../../hooks/api/shipping-options"
 import { EditShippingOptionsPricingForm } from "./components/create-shipping-options-form"
 
 export function LocationServiceZoneShippingOptionPricing() {
   const { so_id, location_id } = useParams()
 
-  const { shipping_options, isPending, isFetching, isError, error } =
-    useShippingOptions({
-      // TODO: change this when GET option by id endpoint is implemented
-      id: [so_id!],
+  if (!so_id) {
+    throw json({
+      message: "Shipping Option ID paramater is missing",
+      status: 404,
+    })
+  }
+
+  const { shipping_option: shippingOption, isError, error } =
+    useShippingOption(so_id, {
       fields: "*prices,*prices.price_rules",
     })
 
-  const shippingOption = shipping_options?.find((so) => so.id === so_id)
-
-  if (!isPending && !isFetching && !shippingOption) {
-    throw json(`Shipping option with id: ${so_id} not found`, { status: 404 })
-  }
-
   if (isError) {
     throw error
   }