英文:
Is there a more efficient way to handle patch request updates other than performing null-checks in spring boot?
问题
有没有比最初执行空值检查更好的更新方法?
@PatchMapping("/base/uri/{id}")
public void updateModel(@Valid @RequestBody Model newModel, @PathVariable Long id) {
modelRepository.findById(id).map(model -> {
if (newModel.getParam1() != null) model.setParam1(newModel.getParam1());
if (newModel.getParam2() != null) model.setParam2(newModel.getParam2());
if (newModel.getParam3() != null) model.setParam3(newModel.getParam3());
if (newModel.getParam4() != null) model.setParam4(newModel.getParam4());
...
modelRepository.save(model);
}).orElseThrow(() -> new MyNotFoundException());
}
英文:
Is there a better approach to updating other than initially performing null-checks?
@PatchMapping("/base/uri/{id}")
public void updateModel(@Valid @RequestBody Model newModel, @Pathvariable Long id) {
modelRepository.findById(id).map(model -> {
if (newModel.getParam1() != null) model.setParam1(newModel.getParam1());
if (newModel.getParam2() != null) model.setParam1(newModel.getParam2());
if (newModel.getParam3() != null) model.setParam1(newModel.getParam3());
if (newModel.getParam4() != null) model.setParam1(newModel.getParam4());
...
modelRespository.save(model);
}).orElseThrow(() -> MyNotFoundException());
}
答案1
得分: 2
你可以使用Spring框架的BeanUtils来添加要忽略的属性(在这种情况下是空属性),示例如下:
import java.beans.FeatureDescriptor;
import java.util.stream.Stream;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.BeanWrapper;
import org.springframework.beans.BeanWrapperImpl;
@PatchMapping("/base/uri/{id}")
public void updateModel(@Valid @RequestBody Model newModel, @PathVariable Long id) {
modelRepository.findById(id).map(model -> {
String[] nulls = getNullPropertyNames(newModel);
// 将newModel复制到model,避免在"nulls"中列出的属性
BeanUtils.copyProperties(newModel, model, nulls);
modelRepository.save(model);
}).orElseThrow(() -> MyNotFoundException());
}
public static String[] getNullPropertyNames(Object source) {
final BeanWrapper wrappedSource = new BeanWrapperImpl(source);
return Stream.of(wrappedSource.getPropertyDescriptors())
.map(FeatureDescriptor::getName)
.filter(propertyName -> wrappedSource.getPropertyValue(propertyName) == null)
.toArray(String[]::new);
}
英文:
You can use the BeanUtils of the spring framework adding the properties to ignore ( which in this case are the null ones ) like this:
import java.beans.FeatureDescriptor;
import java.util.stream.Stream;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.BeanWrapper;
import org.springframework.beans.BeanWrapperImpl;
@PatchMapping("/base/uri/{id}")
public void updateModel(@Valid @RequestBody Model newModel, @Pathvariable Long id) {
modelRepository.findById(id).map(model -> {
String[] nulls = getNullPropertyNames(newModel);
// copy the newModel into model
// avoiding the properties listed in "nulls"
BeanUtils.copyProperties(newModel, model, nulls);
modelRespository.save(model);
}).orElseThrow(() -> MyNotFoundException());
}
public static String[] getNullPropertyNames(Object source) {
final BeanWrapper wrappedSource = new BeanWrapperImpl(source);
return Stream.of(wrappedSource.getPropertyDescriptors())
.map(FeatureDescriptor::getName)
.filter(propertyName -> wrappedSource.getPropertyValue(propertyName) == null)
.toArray(String[]::new);
}
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