fallback to region from redis location_id when region isn't specified

google-beta/resource_redis_instance.go

@@ -208,6 +208,11 @@ func resourceRedisInstanceCreate(d *schema.ResourceData, meta interface{}) error
 		obj["tier"] = tierProp
 	}
 
+	obj, err = resourceRedisInstanceEncoder(d, meta, obj)
+	if err != nil {
+		return err
+	}
+
 	url, err := replaceVars(d, config, "{{RedisBasePath}}projects/{{project}}/locations/{{region}}/instances?instanceId={{name}}")
 	if err != nil {
 		return err
@@ -352,6 +357,11 @@ func resourceRedisInstanceUpdate(d *schema.ResourceData, meta interface{}) error
 		obj["memorySizeGb"] = memorySizeGbProp
 	}
 
+	obj, err = resourceRedisInstanceEncoder(d, meta, obj)
+	if err != nil {
+		return err
+	}
+
 	url, err := replaceVars(d, config, "{{RedisBasePath}}projects/{{project}}/locations/{{region}}/instances/{{name}}")
 	if err != nil {
 		return err
@@ -597,3 +607,13 @@ func expandRedisInstanceReservedIpRange(v interface{}, d TerraformResourceData,
 func expandRedisInstanceTier(v interface{}, d TerraformResourceData, config *Config) (interface{}, error) {
 	return v, nil
 }
+
+func resourceRedisInstanceEncoder(d *schema.ResourceData, meta interface{}, obj map[string]interface{}) (map[string]interface{}, error) {
+	config := meta.(*Config)
+	region, err := getRegionFromSchema("region", "location_id", d, config)
+	if err != nil {
+		return nil, err
+	}
+	d.Set("region", region)
+	return obj, nil
+}

google-beta/resource_redis_instance_test.go

@@ -38,6 +38,38 @@ func TestAccRedisInstance_update(t *testing.T) {
 	})
 }
 
+func TestAccRedisInstance_regionFromLocation(t *testing.T) {
+	t.Parallel()
+
+	name := acctest.RandomWithPrefix("tf-test")
+
+	// Pick a zone that isn't in the provider-specified region so we know we
+	// didn't fall back to that one.
+	region := "us-west1"
+	zone := "us-west1-b"
+	if getTestRegionFromEnv() == "us-west1" {
+		region = "us-central1"
+		zone = "us-central1-a"
+	}
+
+	resource.Test(t, resource.TestCase{
+		PreCheck:     func() { testAccPreCheck(t) },
+		Providers:    testAccProviders,
+		CheckDestroy: testAccCheckRedisInstanceDestroy,
+		Steps: []resource.TestStep{
+			{
+				Config: testAccRedisInstance_regionFromLocation(name, zone),
+				Check:  resource.TestCheckResourceAttr("google_redis_instance.test", "region", region),
+			},
+			{
+				ResourceName:      "google_redis_instance.test",
+				ImportState:       true,
+				ImportStateVerify: true,
+			},
+		},
+	})
+}
+
 func testAccRedisInstance_update(name string) string {
 	return fmt.Sprintf(`
 resource "google_redis_instance" "test" {
@@ -76,3 +108,12 @@ resource "google_redis_instance" "test" {
 	}
 }`, name)
 }
+
+func testAccRedisInstance_regionFromLocation(name, zone string) string {
+	return fmt.Sprintf(`
+resource "google_redis_instance" "test" {
+	name           = "%s"
+	memory_size_gb = 1
+	location_id    = "%s"
+}`, name, zone)
+}