fix(link-modules): fix warn on readonly links (#7403)

packages/modules/link-modules/src/utils/generate-schema.ts

@@ -12,7 +12,8 @@ export function generateGraphQLSchema(
   let fieldNames!: string[]
   let entityName!: string
 
-  if (!joinerConfig.isReadOnlyLink) {
+  const isReadOnlyLink = joinerConfig.isReadOnlyLink
+  if (!isReadOnlyLink) {
     fieldNames = primary.foreignKey.split(",").concat(foreign.foreignKey)
 
     entityName = toPascalCase(
@@ -31,7 +32,11 @@ export function generateGraphQLSchema(
 
   for (const extend of joinerConfig.extends ?? []) {
     const extendedModule = MedusaModule.getModuleInstance(extend.serviceName)
-    if (!extendedModule && !extend.relationship.isInternalService) {
+    if (
+      !isReadOnlyLink &&
+      !extendedModule &&
+      !extend.relationship.isInternalService
+    ) {
       throw new Error(
         `Module ${extend.serviceName} not found. Please verify that the module is configured and installed, also the module must be loaded before the link modules.`
       )
@@ -69,7 +74,7 @@ export function generateGraphQLSchema(
     `
   }
 
-  if (joinerConfig.isReadOnlyLink) {
+  if (isReadOnlyLink) {
     return typeDef
   }