[英]Scala Play Json Reads
我有一個示例代碼如下。
import play.api.libs.json._
import play.api.libs.functional.syntax._
import play.api.data.validation.ValidationError
import play.api.libs.json.Reads._
case class Retailer(firstName:String,lastName:String,email:String,mobileNo:String,password:String)
case class Business(name:String,preferredUrl:String,businessPhone:String,retailer:Retailer)
object JsonTest {
val jsonValue = """
{
"business":
{
"name":"Some Business Name",
"preferredUrl":"someurl",
"businessPhone":"somenumber",
"retailer":
{
"firstName":"Some",
"lastName":"One",
"email":"someone@somewhere.com",
"mobileNo":"someothernumber",
"password":"$^^HFKH*"
}
}
}
"""
def printJson ={
implicit val rltRds = (
(__ \ "firstName").read[String] ~
(__ \ "lastName").read[String] ~
(__ \ "email").read[String] ~
(__ \ "mobileNo").read[String] ~
(__ \ "password").read[String]
)(Retailer)
implicit val bsnsRds = (
(__ \ "name").read[String] ~
(__ \ "preferredUrl").read[String] ~
(__ \ "businessPhone").read[String] ~
(__ \ "retailer").read[Retailer](rltRds)
)(Business)
val buisness = Json.parse(jsonValue).validate[Business](bsnsRds)
val bus = new Business("Some Business","somebusinessurl","somenumber", new Retailer("Some","One","someone@somewhere.com","someothernumber","$^^HFKH*"))
//val json = Json.toJson(bus)
println(buisness)
}
def main(args: Array[String]): Unit = {
printJson
}
}
當我嘗試將json解析為Scala對象(在本例中為Business Class)時,我得到了Json Validation Error。 錯誤是
JsError(List((/retailer,List(ValidationError(validate.error.missing-path,WrappedArray()))), (/preferredUrl,List(ValidationError(validate.error.missing-path,WrappedArray()))), (/name,List(ValidationError(validate.error.missing-path,WrappedArray()))), (/businessPhone,List(ValidationError(validate.error.missing-path,WrappedArray())))))
但是,如果我的json是喜歡的
val jsonValue = """
{
"name":"Some Business Name",
"preferredUrl":"someurl",
"businessPhone":"somenumber",
"retailer":
{
"firstName":"Some",
"lastName":"One",
"email":"someone@somewhere.com",
"mobileNo":"someothernumber",
"password":"$^^HFKH*"
}
}
"""
請注意,外部括號“{”和“business:”鍵被刪除。 我得到了一個JsSuccess。 如何在第一種情況下為Json寫入讀取? 另外,我怎么能以通用的方式做到這一點?
請幫忙。
只需在路徑中添加business
鍵:
implicit val bsnsRds = (
(__ \ "business" \ "name").read[String] ~
(__ \ "business" \ "preferredUrl").read[String] ~
(__ \ "business" \ "businessPhone").read[String] ~
(__ \ "business" \ "retailer").read[Retailer](rltRds)
)(Business)
以上略有變化:
implicit val bsnsRds = ({
val business = (__ \ "business")
(business \ "name").read[String] ~
(business \ "preferredUrl").read[String] ~
(business \ "businessPhone").read[String] ~
(business \ "retailer").read[Retailer](rltRds)
})(Business)
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