Fix foreign key generation

[FelipeRos19]

If an entity was used as a field (to generate a relationship) and the primary key of this entity contained the AUTO_INCREMENT attribute, it was loaded along with the query, generating incorrect SQL and preventing the table from being created.

To fix this problem, it was only necessary to clear the creation of the foreign key.

Old code: code

if(type == FieldType.ENTITY && fieldClass_relational != null){
            EntityMeta cMeta = Worm.getRegistry().getTableMeta(fieldClass_relational);
            if(cMeta.getUniqueKeyColumns().size() != 1)
                throw new WormException("Relational Worm tables need to have only one unique keys");
            WormField key = cMeta.getUniqueKeyColumns().toArray(WormField[]::new)[0];
            StringBuilder sql = new StringBuilder(key.getSqlCreation());
            sql.append(", CONSTRAINT FK_").append(getName()).append("_").append(cMeta.getName()).append(" FOREIGN KEY (").append(getName()).append(") REFERENCES ")
                    .append(cMeta.getName()).append(" (").append(key.getName()).append(")");
            if(onDelete != null)
                sql.append(" ON DELETE ").append(onDelete.getValue());
            if(onUpdate != null)
                sql.append(" ON UPDATE ").append(onUpdate.getValue());
            return sql.toString();
        }

New code:

if(type == FieldType.ENTITY && fieldClass_relational != null){
            EntityMeta cMeta = Worm.getRegistry().getTableMeta(fieldClass_relational);
            if (cMeta.getUniqueKeyColumns().size() != 1)
                throw new WormException("Relational Worm tables need to have only one unique keys");

            WormField key = cMeta.getUniqueKeyColumns().toArray(WormField[]::new)[0];

            StringBuilder sql = new StringBuilder();
            sql.append(key.getType().getValue());
            if (key.getLength() > 0)
                sql.append('(').append(key.getLength()).append(')');

            if (!nullable)
                sql.append(" NOT NULL");

            sql.append(", CONSTRAINT FK_").append(getName()).append("_").append(cMeta.getName())
                    .append(" FOREIGN KEY (").append(getName()).append(") REFERENCES ")
                    .append(cMeta.getName()).append(" (").append(key.getName()).append(")");

            if (onDelete != null)
                sql.append(" ON DELETE ").append(onDelete.name());

            if (onUpdate != null)
                sql.append(" ON UPDATE ").append(onUpdate.name());

            return sql.toString();
        }

The main difference between the old and new code is that the StringBuilder does not inherit the original characteristics; it only reconstructs them with the necessary data.