CODEWITHSUNDEEP
c#jsonunity-game-enginejson-deserialization
Pixelmation
Pixelmation

Reputation: 23

Deserializing specific JSON fields into a list of objects in Unity

For a personal project, I'm trying to deserialize a big Json array into a list of objects, however I repeatedly run into issues when following other guides. I have the following json file:

{
  PokemonJSONList : [
    {
      "id": 1,
      "region": "Kanto",
      "name": "Bulbasaur",
      "typeList": [ "Grass", "Poison" ]
    },
    {
      "id": 2,
      "region": "Kanto",
      "name": "Ivysaur",
      "typeList": [ "Grass", "Poison" ]
    },
    {
      "id": 3,
      "region": "Kanto",
      "name": "Venusaur",
      "typeList": [ "Grass", "Poison" ]
    },
    {
      "id": 3,
      "form": "f2",
      "region": "Kalos",
      "name": "Mega Venusaur",
      "typeList": [ "Grass", "Poison" ]
    },
    {
      "id": 3,
      "form": "f3",
      "region": "Galar",
      "name": "G-Max Venusaur",
      "typeList": [ "Grass", "Poison" ]
    },
    {
      "id": 4,
      "region": "Kanto",
      "name": "Charmander",
      "typeList": [ "Fire" ]
    },
...
    {
      "id": 898,
      "form": "f4",
      "region": "Galar",
      "Legend": "true",
      "name": "Shadow Rider Calyrex",
      "typeList": [ "Psychic", "Grass" ]
    }
  ]
}

As you can see, some json entries have more key-value pairs than others, as this json file is used for more than just this project. I only need the Name, Region, Typelist, and Legend(not shown, as the json file goes on considerably longer) fields. I also have this class:

[System.Serializable]
public class PokemonList : MonoBehaviour
{
    public List<PokemonOBJ> PokemonJSONList;
}

Meant to recieve this json data, and this class:

[System.Serializable]
public class PokemonOBJ : MonoBehaviour
{
    public string Name { get; set; }
    public string Region { get; set; }
    public List<string> TypeList { get; set; }
    public bool Legend { get; set; }
}

To be the base object for storing the data for each entry. However, when trying to serialize the json file as such:

string jsonString = @"Assets/JSON/data.json";
    public PokemonList PokemonDB;
PokemonDB = JsonUtility.FromJson<PokemonList>(jsonString);

results in a "cannot deserialize JSON to new instances of type PokemonList" tutorials I used showed using PokemonOBJ for FromJson but that results an error in vs itself, and I'm a bit lost here on how to get this working properly, and what I'm doing wrong.

Upvotes: 2

Views: 2275

Answers (1)

David Jones
David Jones

Reputation: 3382

From the docs:

Only plain classes and structures are supported; classes derived from UnityEngine.Object (such as MonoBehaviour or ScriptableObject) are not.

Upvotes: 1

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