fixed labels for array value

mmv1/products/billingbudget/terraform.yaml

@@ -87,6 +87,8 @@ overrides: !ruby/object:Overrides::ResourceOverrides
         default_from_api: true
       budgetFilter.labels: !ruby/object:Overrides::Terraform::PropertyOverride
         default_from_api: true
+        custom_expand: 'templates/terraform/custom_expand/billing_budget_budget_filter_labels.erb'
+        custom_flatten: "templates/terraform/custom_flatten/billing_budget_budget_filter_labels.erb"
       budgetFilter.projects: !ruby/object:Overrides::Terraform::PropertyOverride
         is_set: true
 

mmv1/templates/terraform/custom_expand/billing_budget_budget_filter_labels.erb

@@ -0,0 +1,10 @@
+func expand<%= prefix -%><%= titlelize_property(property) -%>(v interface{}, d TerraformResourceData, config *Config) (map[string][]string, error) {
+	if v == nil {
+		return map[string][]string{}, nil
+	}
+	m := make(map[string][]string)
+	for k, val := range v.(map[string]interface{}) {
+		m[k] = []string{val.(string)}
+	}
+	return m, nil
+}

mmv1/templates/terraform/custom_flatten/billing_budget_budget_filter_labels.erb

@@ -0,0 +1,24 @@
+func flatten<%= prefix -%><%= titlelize_property(property) -%>(v interface{}, d *schema.ResourceData, config *Config) interface{} {
+    /*
+    note: api only accepts below format. Also only takes a single element in the array
+    labels = {
+        foo = ["bar"]
+    }
+    until now, sdk does not take array for the map value
+    */
+    if v == nil {
+        return nil
+    }
+    original := v.(map[string]interface{})
+    if len(original) == 0 {
+        return nil
+    }
+    transformed := make(map[string]interface{})
+    for key, val := range original {
+        l := val.([]interface{})
+        for _, v := range l {
+            transformed[key] = v.(string)
+        }
+    }
+    return transformed
+}

mmv1/third_party/terraform/tests/resource_billing_budget_test.go

@@ -43,6 +43,9 @@ resource "google_billing_budget" "budget" {
 
   budget_filter {
     projects = ["projects/${data.google_project.project.number}"]
+    labels  = {
+      label = "bar"
+    }
   }
 
   amount {