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XKE PlayFramework's Json in scala

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Fabian Gutierrez

This document discusses JSON mapping in Play Framework. It provides examples of building JSON objects from case classes, reading JSON into case classes, and writing case classes to JSON. It also discusses Play's JSON mapper and using JSON paths to access fields.

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Json mapping in pLAY! Fabian Gutierrez
Mandatory verbose java example Jonathan @JsonInclude(JsonInclude.Include.NON_NULL) @Generated("org.jsonschema2pojo") @JsonPropertyOrder({ "name", "age" }) public class Actor { @JsonProperty("nombre") private String name; @JsonProperty("age") private Integer age; }
XKE PlayFramework's Json in scala
Seriously Building JsValues Reads Writes Paths
Plays json mapper
Building a JsValue Types JsString JsNumber JsBoolean JsObject JsArray JsNull Json.parse(""" |{ | "name" : "Jennifer", | "Age": 26 |} """.stripMargin )
The Reader
Reading Json case class Actor(name: String, age: Int) object Actor { // or default values implicit val actorReads = Json.reads[Actor] // functional syntax implicit val actorReads: Reads[Actor] = ( (JsPath "nombre").read[String] and (JsPath "age").read[Int] )(Actor.apply _) }
The (ghost) writer
Writing Json object Actor { //default values implicit val actorWrites = Json.writes[Actor] //or total control implicit val actorWrites = new Writes[Actor] { def writes(actor: Actor) = Json.obj( "name" -> actor.name, "age" -> actor.age ) } //or functional syntax implicit val actorWrites: Writes[Actor] = ( (JsPath "name").write[String] and (JsPath "age").write[Int] )(unlift(Actor.unapply)) }
XKE PlayFramework's Json in scala
Paths // direct parsing val jsPerson: JsObject = ... (jsPerson "name").as[String] (jsPerson "age").as[Int] // as optionals val jsPersonList: JsObject = ... (jsPersonList "name").asOpt[List[String]]
https://github.com/fagossa/xke_play_json

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XKE PlayFramework's Json in scala

  • 1. Json mapping in pLAY! Fabian Gutierrez
  • 2. Mandatory verbose java example Jonathan @JsonInclude(JsonInclude.Include.NON_NULL) @Generated("org.jsonschema2pojo") @JsonPropertyOrder({ "name", "age" }) public class Actor { @JsonProperty("nombre") private String name; @JsonProperty("age") private Integer age; }
  • 4. Seriously Building JsValues Reads Writes Paths
  • 6. Building a JsValue Types JsString JsNumber JsBoolean JsObject JsArray JsNull Json.parse(""" |{ | "name" : "Jennifer", | "Age": 26 |} """.stripMargin )
  • 8. Reading Json case class Actor(name: String, age: Int) object Actor { // or default values implicit val actorReads = Json.reads[Actor] // functional syntax implicit val actorReads: Reads[Actor] = ( (JsPath "nombre").read[String] and (JsPath "age").read[Int] )(Actor.apply _) }
  • 10. Writing Json object Actor { //default values implicit val actorWrites = Json.writes[Actor] //or total control implicit val actorWrites = new Writes[Actor] { def writes(actor: Actor) = Json.obj( "name" -> actor.name, "age" -> actor.age ) } //or functional syntax implicit val actorWrites: Writes[Actor] = ( (JsPath "name").write[String] and (JsPath "age").write[Int] )(unlift(Actor.unapply)) }
  • 12. Paths // direct parsing val jsPerson: JsObject = ... (jsPerson "name").as[String] (jsPerson "age").as[Int] // as optionals val jsPersonList: JsObject = ... (jsPersonList "name").asOpt[List[String]]