repeating modules

[frail osprey]

Hello I started my app with modular monolith architecture and I noticed some problem because 4 modules will look very similar user, student, classroom, class all of them will have just validation and CRUD operations and I dont wanna repeat my code 4times so what to do?

[thick pendant]

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[earnest gull]

you can create another module containing the common code and dependencies

and then just use that module as a dependency in the other modules

[frail osprey]

I dont think it is that easy look at my facades

    public ClassroomResponseDto addClassroomLayout(ClassroomDto classroomLayoutFromUser) {
        Integer columns = classroomLayoutFromUser.columns();
        Integer rows = classroomLayoutFromUser.rows();
        ValidatorResultFacade validate = classroomValidator.validate(columns, rows);
        String message = validate.resultMessage();
        if(validate.isValid()) {
            repository.save(new Classroom(columns, rows));
        }
        return new ClassroomResponseDto(message, columns, rows);
    }

    public StudentDto addStudent(StudentDto studentInputData) {
        String firstName = studentInputData.firstName();
        String lastName = studentInputData.lastName();
        Byte age = studentInputData.age();

        ValidatorResultFacade validate = studentValidator.validate(firstName, lastName, age);
        if(validate.isValid()) {
            repository.save(new Student(firstName, lastName, age));
        }

        return studentInputData;
    }

[earnest gull]

you could do that (would do exactly the same)

    public <T,U> T addElement(T inputData, Function<T,ValidatorResultFacade> validator, Function<T,U> mapper) {
        ValidatorResultFacade validate = validator.apply(inputData);
        if(validate.isValid()) {
            repository.save(mapper.apply(inputData));
        }

        return inputData;
    }

or

    public <T,U> T addElement(T inputData, ValidatorResultFacade validate, Function<T,U> mapper) {
        if(validate.isValid()) {
            repository.save(mapper.apply(inputData));
        }

        return inputData;
    }

or you could add methods to your DTO that convert it to a DB object and to validate it and declare these in a common interface for your DTOs

but aside from that, you can't do much