patchy

A Spring method argument resolver that is suitable for PATCH handling combined with validation.

This simple library let's you apply client provided changes to an entity while at the same time keep the benefits of request validation:

class Request : PatchyRequest {
    @get:NotBlank
    val firstName:String? by { _changes }

    @get:NotBlank
    val lastName:String? by { _changes }
    
    override var _changes = mapOf<String,Any?>()
}

@RestController
class PatchingCtrl {
    @RequestMapping("/", method = arrayOf(RequestMethod.PATCH))
    fun update(@Valid request: Request){
        request.applyChangesTo(entity)
    }
}

Setup

build.gradle:

repositories {
    jcenter()
    maven { url "https://jitpack.io" }
}

dependencies {
    compile 'com.github.bright:patchy:v0.1.0'
    ...
}

Then import the configuration with:

@SpringBootApplication
@EnableWebMvc
@Import(PatchyConfiguration::class)
open class Application {