ModelMapper不忽略空值 [英] ModelMapper not ignoring null values

问题描述

我想对我的一个实体进行部分更新，但是如果一个属性为null，则要更新的实体也会将该值设置为null.我希望如果源中的属性为null，则保留源中的一个.

I want to do a partial update on one of my entities but if one propertie is null then the entity to be updated gets that value set to null too. I want that if a property from the source is null then to keep the one from the source.

我尝试过但没有运气:

    @Bean
    public ModelMapper modelMapper() {
        ModelMapper modelMapper = new ModelMapper();
        modelMapper.getConfiguration().setPropertyCondition(Conditions.isNotNull());
        modelMapper.createTypeMap(String.class, Date.class);
        modelMapper.addConverter(new StringToDate());
        modelMapper.addConverter(new DateToString());
        return modelMapper;
    }

然后我像这样更新我的对象:

Then I update my object like this:

    @Override
    public void editUser(final User user) {
        UserDocument userDocument = this.usersRepository.findByIdAndActivo(user.getId(), true)
                .orElseThrow(UserNotFoundException::new);

        userDocument = this.modelMapper.map(user, UserDocument.class);
        this.usersRepository.save(userDocument);
    }

user对象的1个属性设置为null，而对象userDocument的该属性带有值，那么当我将其保存在数据库中时，该值就消失了(因为它已转换为null).

The user object has 1 property set at null while the object userDocument has it with a value, then when I save it in the database that value is gone (because it has transformed into null).

有什么问题吗?

谢谢.

推荐答案

好的，这样配置就不是我想的目的.

Okay so that configuration isn't for the purpose I thought it was.

我通过将更新的对象与旧对象合并来解决了这个问题:

I've solved the issue by merging the updated object with the old one like this:

    @Override
    public void editUser(final User user) {
        UserDocument userDocument = this.usersRepository.findByIdAndActivo(user.getId(), true)
                .orElseThrow(UserNotFoundException::new);

        this.modelMapper.map(user, userDocument);
        this.usersRepository.save(userDocument);
    }

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