#1903 - Add ability to set migration path via DbMigration

src/main/java/io/ebean/dbmigration/DbMigration.java

@@ -62,6 +62,23 @@ public interface DbMigration {
    */
   void setPathToResources(String pathToResources);
 
+  /**
+   * Set the path where migrations are generated to (which defaults to "dbmigration").
+   * <p>
+   * Normally we only use this when we use Ebean to generate the database migrations
+   * and then use some other tool like FlywayDB to run the migrations.
+   * <p>
+   * Example: with <code>setMigrationPath("db/migration")</code> ... the migrations
+   * are generated into <code>src/resources/db/migration</code>.
+   * <p>
+   * Note that if Ebean migration runner is used we should not use this method but
+   * instead set the migrationPath via a property such that both the migration generator
+   * and migration runner both use the same path.
+   *
+   * @param migrationPath The path that migrations are generated into.
+   */
+  void setMigrationPath(String migrationPath);
+
   /**
    * Set the server to use to determine the current model.
    * Typically this is not called explicitly.

src/main/java/io/ebeaninternal/dbmigration/DefaultDbMigration.java

@@ -91,6 +91,8 @@ public class DefaultDbMigration implements DbMigration {
 
   protected String pathToResources = "src/main/resources";
 
+  protected String migrationPath;
+
   protected DatabasePlatform databasePlatform;
 
   private boolean vanillaPlatform;
@@ -138,6 +140,11 @@ public class DefaultDbMigration implements DbMigration {
     this.pathToResources = pathToResources;
   }
 
+  @Override
+  public void setMigrationPath(String migrationPath) {
+    this.migrationPath = migrationPath;
+  }
+
   /**
    * Set the server to use to determine the current model.
    * Typically this is not called explicitly.
@@ -685,6 +692,9 @@ public class DefaultDbMigration implements DbMigration {
       if (applyPrefix != null) {
         migrationConfig.setApplyPrefix(applyPrefix);
       }
+      if (migrationPath != null) {
+        migrationConfig.setMigrationPath(migrationPath);
+      }
       if (header != null) {
         migrationConfig.setDdlHeader(header);
       }

src/test/java/io/ebeaninternal/dbmigration/DbMigrationGenerateTest.java

@@ -41,7 +41,8 @@ public class DbMigrationGenerateTest {
     // We use src/test/resources as output directory (so we see in GIT if files will change)
 
     migration.setPathToResources("src/test/resources");
-
+    migration.setMigrationPath("db/migration");
+    migration.setMigrationPath(null); // use the default for this test
 
     // migration.addPlatform(Platform.GENERIC, "generic"); there is no ddl handler for generic
     // migration.addPlatform(Platform.SQLANYWHERE, "sqlanywhere"); and sqlanywhere