migrate: refactor examples to use the new FromFS function

Author: mmatczuk

Diff for: migrate/example/cql/embed.go

@@ -0,0 +1,13 @@
+// Copyright (C) 2017 ScyllaDB
+// Use of this source code is governed by a ALv2-style
+// license that can be found in the LICENSE file.
+
+// +build all integration
+
+package cql
+
+import "embed"
+
+// Files contains *.cql schema migration files.
+//go:embed *.cql
+var Files embed.FS

Diff for: migrate/example/migrations/m1.cql renamed to migrate/example/cql/m1.cql

@@ -13,6 +13,7 @@ import (
 	"github.com/scylladb/gocqlx/v2"
 	"github.com/scylladb/gocqlx/v2/gocqlxtest"
 	"github.com/scylladb/gocqlx/v2/migrate"
+	"github.com/scylladb/gocqlx/v2/migrate/example/cql"
 )
 
 // Running examples locally:
@@ -21,40 +22,40 @@ import (
 func TestExample(t *testing.T) {
 	const ks = "migrate_example"
 
+	// Create keyspace
 	cluster := gocqlxtest.CreateCluster()
 	cluster.Keyspace = ks
-
 	if err := gocqlxtest.CreateKeyspace(cluster, ks); err != nil {
 		t.Fatal("CreateKeyspace:", err)
 	}
+
+	// Create session using the keyspace
 	session, err := gocqlx.WrapSession(cluster.CreateSession())
 	if err != nil {
 		t.Fatal("CreateSession:", err)
 	}
 	defer session.Close()
 
 	// Add callback prints
-	printEvent := func(ctx context.Context, session gocqlx.Session, ev migrate.CallbackEvent, name string) error {
+	log := func(ctx context.Context, session gocqlx.Session, ev migrate.CallbackEvent, name string) error {
 		t.Log(ev, name)
 		return nil
 	}
-
 	reg := migrate.CallbackRegister{}
-	reg.Add(migrate.BeforeMigration, "m1.cql", printEvent)
-	reg.Add(migrate.AfterMigration, "m1.cql", printEvent)
-	reg.Add(migrate.CallComment, "1", printEvent)
-	reg.Add(migrate.CallComment, "2", printEvent)
-	reg.Add(migrate.CallComment, "3", printEvent)
-
+	reg.Add(migrate.BeforeMigration, "m1.cql", log)
+	reg.Add(migrate.AfterMigration, "m1.cql", log)
+	reg.Add(migrate.CallComment, "1", log)
+	reg.Add(migrate.CallComment, "2", log)
+	reg.Add(migrate.CallComment, "3", log)
 	migrate.Callback = reg.Callback
 
 	// First run prints data
-	if err := migrate.Migrate(context.Background(), session, "migrations"); err != nil {
+	if err := migrate.FromFS(context.Background(), session, cql.Files); err != nil {
 		t.Fatal("Migrate:", err)
 	}
 
 	// Second run skips the processed files
-	if err := migrate.Migrate(context.Background(), session, "migrations"); err != nil {
+	if err := migrate.FromFS(context.Background(), session, cql.Files); err != nil {
 		t.Fatal("Migrate:", err)
 	}
 }