azurerm_cosmosdb_mongo_database doesn't call get throughput api when cosmos account is serverless

azurerm/internal/services/cosmos/cosmosdb_mongo_database_resource.go

@@ -197,6 +197,7 @@ func resourceArmCosmosDbMongoDatabaseUpdate(d *schema.ResourceData, meta interfa
 
 func resourceArmCosmosDbMongoDatabaseRead(d *schema.ResourceData, meta interface{}) error {
 	client := meta.(*clients.Client).Cosmos.MongoDbClient
+	accountClient := meta.(*clients.Client).Cosmos.DatabaseClient
 	ctx, cancel := timeouts.ForRead(meta.(*clients.Client).StopContext, d)
 	defer cancel()
 
@@ -224,16 +225,37 @@ func resourceArmCosmosDbMongoDatabaseRead(d *schema.ResourceData, meta interface
 		}
 	}
 
-	throughputResp, err := client.GetMongoDBDatabaseThroughput(ctx, id.ResourceGroup, id.Account, id.Name)
+	accResp, err := accountClient.Get(ctx, id.ResourceGroup, id.Account)
 	if err != nil {
-		if !utils.ResponseWasNotFound(throughputResp.Response) {
-			return fmt.Errorf("Error reading Throughput on Cosmos Mongo Database %q (Account: %q): %+v", id.Name, id.Account, err)
-		} else {
-			d.Set("throughput", nil)
-			d.Set("autoscale_settings", nil)
+		return fmt.Errorf("reading CosmosDB Account %q (Resource Group %q): %+v", id.Account, id.ResourceGroup, err)
+	}
+
+	if accResp.ID == nil || *accResp.ID == "" {
+		return fmt.Errorf("cosmosDB Account %q (Resource Group %q) ID is empty or nil", id.Account, id.ResourceGroup)
+	}
+
+	// if the cosmos Account is serverless, it could not call the get throughput api
+	if props := accResp.DatabaseAccountGetProperties; props != nil && props.Capabilities != nil {
+		serverless := false
+		for _, v := range *props.Capabilities {
+			if *v.Name == "EnableServerless" {
+				serverless = true
+			}
+		}
+
+		if !serverless {
+			throughputResp, err := client.GetMongoDBDatabaseThroughput(ctx, id.ResourceGroup, id.Account, id.Name)
+			if err != nil {
+				if !utils.ResponseWasNotFound(throughputResp.Response) {
+					return fmt.Errorf("Error reading Throughput on Cosmos Mongo Database %q (Account: %q): %+v", id.Name, id.Account, err)
+				} else {
+					d.Set("throughput", nil)
+					d.Set("autoscale_settings", nil)
+				}
+			} else {
+				common.SetResourceDataThroughputFromResponse(throughputResp, d)
+			}
 		}
-	} else {
-		common.SetResourceDataThroughputFromResponse(throughputResp, d)
 	}
 
 	return nil

azurerm/internal/services/cosmos/cosmosdb_mongo_database_resource_test.go

@@ -87,6 +87,25 @@ func TestAccAzureRMCosmosDbMongoDatabase_autoscale(t *testing.T) {
 	})
 }
 
+func TestAccAzureRMCosmosDbMongoDatabase_serverless(t *testing.T) {
+	data := acceptance.BuildTestData(t, "azurerm_cosmosdb_mongo_database", "test")
+
+	resource.ParallelTest(t, resource.TestCase{
+		PreCheck:     func() { acceptance.PreCheck(t) },
+		Providers:    acceptance.SupportedProviders,
+		CheckDestroy: testCheckAzureRMCosmosDbMongoDatabaseDestroy,
+		Steps: []resource.TestStep{
+			{
+				Config: testAccAzureRMCosmosDbMongoDatabase_serverless(data),
+				Check: resource.ComposeAggregateTestCheckFunc(
+					testCheckAzureRMCosmosDbMongoDatabaseExists(data.ResourceName),
+				),
+			},
+			data.ImportStep(),
+		},
+	})
+}
+
 func testCheckAzureRMCosmosDbMongoDatabaseDestroy(s *terraform.State) error {
 	client := acceptance.AzureProvider.Meta().(*clients.Client).Cosmos.MongoDbClient
 	ctx := acceptance.AzureProvider.Meta().(*clients.Client).StopContext
@@ -182,3 +201,15 @@ resource "azurerm_cosmosdb_mongo_database" "test" {
 }
 `, testAccAzureRMCosmosDBAccount_basic(data, documentdb.MongoDB, documentdb.Strong), data.RandomInteger, maxThroughput)
 }
+
+func testAccAzureRMCosmosDbMongoDatabase_serverless(data acceptance.TestData) string {
+	return fmt.Sprintf(`
+%[1]s
+
+resource "azurerm_cosmosdb_mongo_database" "test" {
+  name                = "acctest-%[2]d"
+  resource_group_name = azurerm_cosmosdb_account.test.resource_group_name
+  account_name        = azurerm_cosmosdb_account.test.name
+}
+`, testAccAzureRMCosmosDBAccount_capabilities(data, documentdb.MongoDB, []string{"EnableServerless", "mongoEnableDocLevelTTL", "EnableMongo"}), data.RandomInteger)
+}