#1267 - DDL issue on @OneToMany @JoinTable ... extra unnecessary index created on fk column

src/main/java/io/ebeaninternal/dbmigration/model/MTable.java

@@ -656,4 +656,12 @@ public class MTable {
     return draftTableName + "." + references.substring(lastDot + 1);
   }
 
+  /**
+   * Clear the indexes on the foreign keys as they are covered by unique constraints.
+   */
+  public void clearForeignKeyIndexes() {
+    for (MCompoundForeignKey compoundKey : compoundKeys) {
+      compoundKey.setIndexName(null);
+    }
+  }
 }

src/main/java/io/ebeaninternal/dbmigration/model/build/ModelBuildPropertyVisitor.java

@@ -133,6 +133,7 @@ public class ModelBuildPropertyVisitor extends BaseTablePropertyVisitor {
         // in the middle of rendering the create table DDL
         MTable intersectionTable = new ModelBuildIntersectionTable(ctx, p).build();
         if (p.isO2mJoinTable()) {
+          intersectionTable.clearForeignKeyIndexes();
           Collection<MColumn> cols = intersectionTable.allColumns();
           if (cols.size() == 2) {
             // always the second column that we put the unique constraint on