Question 109384 in Json Question posted in
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Parse json object to kotlin data class list like an hasmap

i have one difficult to parse one jsonObject to data class object, I need that one list of this object:

data class DataClassExample(val mandatory: Boolean,
val name: String,
val regex: String?,
val regex_check: Boolean)

and I have this json object where each list object I need transform in one single list of the data class object:

{
"defaultParameters": [
{
  "name": "business",
  "mandatory": true,
  "type": "String",
  "regex": "",
  "regex_check": true
},
{
  "name": "environment",
  "mandatory": true,
  "type": "String",
  "regex": "",
  "regex_check": true
}
],
"userParameters": [
{
  "name": "person_id",
  "mandatory": true,
  "type": "String",
  "regex": "",
  "regex_check": true
} ]

I will filter by objectName, for example "defaultParameters", and convert the list in the data class, my expected result is:

listOf(DataClassExample(name = "", mandatory = true, type = "String", regex = "", ...), DataClassExample(...))

I tryed get this value using this code:

val response = allowList.filterKeys {
        it == "defaultParameters"
    } as MutableMap<String, String>

but I dont now how transform this code in data class list.
Tks

Tags:

2

Answers


  1. 0

    I can recommend a 3rd party library call Klaxon

    Import it with adding this to your Gradle file:

    dependencies {
    implementation 'com.beust:klaxon:5.5'
    ...
}

    If your list is:

    val data = """[
            {
              "name": "business",
              "mandatory": true,
              "type": "String",
              "regex": "",
              "regex_check": true
            },
            {
              "name": "environment",
              "mandatory": true,
              "type": "String",
              "regex": "",
              "regex_check": true
            }
         ]"""

    The Parsing line would be:

    Klaxon().parseArray<DataClassExample>(data)
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  2. 0

    You probably want to pull in a Serialization library, for example Kotlin Serialization

    It’s unclear if you’re trying to only serialize/deserialize a subset of the json, if so you’ll need to parse it first.

    Here’s an example deserializing the entire data.

    We’ll use the Serializable annotations.

    Let’s create a data class to hold both default and user params:

    @Serializable
data class AllParameters(
    val defaultParameters: List<Parameters>,
    val userParameters: List<Parameters>
)

@Serializable
data class Parameters(
    val mandatory: Boolean,
    val name: String,
    val type: String,
    val regex: String?,
    @SerialName("regex_check")
    val regexCheck: Boolean
)

    And deserialzing to object:

    val obj = Json.decodeFromString<AllParameters>(data)
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