[英]creating json array in argonaut scala
I am fairly new to scala , play framework and argonaut. 我对scala,游戏框架和argonaut相当陌生。 Following is my case class which contains a variable of type List[Remedy] My aim is to generate a json response of the PredictionModel object which contains JsonArray of List[Remedy].
以下是我的案例类,其中包含类型为List [Remedy]的变量。我的目标是生成PredictionModel对象的json响应,该对象包含List [Remedy]的JsonArray。
package models
import scala.collection.mutable.ListBuffer
import argonaut._, Argonaut._
/**
* Created by abhishek on 15/01/16.
*/
case class PredictionModel() {
var aboutKundali: AboutKundli = new AboutKundli()
var planetStatus = new ListBuffer[PlanetStatus].toList
var donate = ""
var notToDonate = ""
var colorNotToWear = ""
var favouredGod = ""
var aboutEducationAndOccupation = ""
var mixMahaDashaCurrent = ""
var mixMahaDashaNotCurrent = ""
var category = ""
var rinnPitri = ""
var lifeHead = ""
var disease = ""
var occupation = ""
var marriedLife = ""
var santan = ""
var parents = ""
var nature = ""
var remedyList = new ListBuffer[Remedy].toList
var importantInformation = ""
}
Implicit for PredictionModel is written like :- PredictionModel的隐式写法是:-
implicit def predicationEncodeJson: EncodeJson[PredictionModel] =
EncodeJson((prediction: PredictionModel) =>
("about_kundali" := argonaut.Json(
"birth_rashi" := prediction.aboutKundali.birthRashi,
"lagan_rashi" := prediction.aboutKundali.laganRashi,
"birth_day_planet" := prediction.aboutKundali.birthDayPlanet,
"birth_time_planet" := prediction.aboutKundali.birthTimePlanet,
"current_maha_dasha" := prediction.aboutKundali.currentMahaDasha,
"lucky_day" := prediction.aboutKundali.luckyDay,
"lucky_number" := prediction.aboutKundali.luckyNumber
)) ->:
("important_information" := prediction.importantInformation) ->:
("rinnPitri" := prediction.rinnPitri) ->:
("category" := prediction.category) ->:
("mix_mahadasha_not_current" := prediction.mixMahaDashaNotCurrent) ->:
("mix_mahadasha_current" := prediction.mixMahaDashaCurrent) ->:
("about_education_and_occupation" := prediction.aboutEducationAndOccupation) ->:
("favored_god" := prediction.favouredGod) ->:
("color_not_to_wear" := prediction.colorNotToWear) ->:
("donate" := prediction.donate) ->:
("not_to_donate" := prediction.notToDonate) ->: jEmptyObject)
Everything about runs just fine, but what should i do to add JsonArray in prodiction Json object 关于一切的一切都很好,但我应该怎么做才能在生产Json对象中添加JsonArray
Edit 1 As suggested here is my test case class 编辑1如建议的是我的测试用例类
import argonaut._, Argonaut._
case class TestModel(id: Int, name: String) {
}
object TestModel{
implicit def PredictionModelCodecJson = CodecJson[TestModel] =
casecodec20(TestModel.apply, TestModel.unapply)("id", "name")
}
While declaring casecodec20 i have an error in apply and unapply method. 声明casecodec20时,apply和unapply方法出错。 Do i need to over-ride them ?
我需要超越他们吗? Also how to call this implicit value ?
还如何调用此隐式值?
Edit 2 编辑2
So here is what needs to be done. 所以这是需要做的。 Create case class with all the parameters in constrcutor and a subsequent object class which contains CodecJson like below
使用构造函数中的所有参数以及随后的包含CodecJson的对象类创建案例类,如下所示
case class Remedy(no: Int, description: String) {
}
object Remedy{
implicit def RemedyCodecJson: CodecJson[Remedy] =
casecodec2(Remedy.apply, Remedy.unapply)("number", "description")
}
In my case i had more complex models inside models so i just created implicit CodecJson for all. 就我而言,我在模型内部拥有更复杂的模型,因此我只为所有人创建了隐式CodecJson。 How to use it ?
如何使用它 ?
remedy.asJson
When you have a case class it is much easier because you can use casecodec
: 当拥有一个case类时,它会容易得多,因为您可以使用
casecodec
:
implicit def PredictionModel CodecJson: CodecJson[PredictionModel] =
casecodec20(PredictionModel.apply, PredictionModel.unapply)("aboutKundali", "planetStatus", "donate", .....)
And now you have a JSON codec for your PredictionModel
which will encode and decode your case class from/to json. 现在,您的
PredictionModel
具有JSON编解码器,它将对json中的case类进行编码和解码。
In order to make it work you can define your AboutKundli
, PlanetStatus
and Remedy
as case classes and create casecodec
s for them in a similar way. 为了使其工作,您可以将
AboutKundli
, PlanetStatus
和Remedy
定义为案例类,并以类似的方式为其创建casecodec
。
Note that it is highly recommended to declare case classes in a way where all the paramerers are defined in their constructors and not how you show in your example. 请注意,强烈建议以所有参数在其构造函数中定义的方式声明case类,而不是在示例中显示方式。 A better way would be:
更好的方法是:
case class PredictionModel(
aboutKundali: AboutKundli,
planetStatus: List[PlanetStatus],
donate: String,
notToDonate: String
colorNotToWear: String
favouredGod: String,
aboutEducationAndOccupation: String,
mixMahaDashaCurrent: String,
mixMahaDashaNotCurrent: String,
category: String,
rinnPitri: String,
lifeHead: String,
disease: String,
occupation: String,
marriedLife: String,
santan: String,
parents: String,
nature: String,
remedyList: List[Remedy],
importantInformation: String)
It is not only stylistic and there are technical reasons to do so (related to how apply/unapply/equality are generated for the case class) so it is better to follow this practice. 这样做不仅是风格上的,而且有技术上的原因(与案例类如何生成适用/不适用/平等有关),因此最好遵循这种做法。
In general you should follow the rule that case classes are immutable and all the values are declared as their constructor parameters. 通常,您应该遵循以下规则:case类是不可变的,并且所有值都声明为其构造函数参数。
Once you have declared codecs for your case classes you have codecs for lists "for free" because Argonaut can encode List[A]
if it can see that it can encode that A
, so you don't need to do anything special here. 在为案例类声明了编解码器之后,就可以“免费”使用列表的编解码器,因为Argonaut如果可以看到
List[A]
可以对A
进行编码,就可以对其进行编码,因此您无需在此处进行任何特殊操作。
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