从 .Net Core 控制台应用程序更新 Firebase Firestore 中的文档

Question

用例

使用 firestore 作为持久性形式的 Angular Firebase 应用程序需要与 Discord Bot 通信。我已经构建了一个同步器机器人来在现有的外部机器人和 Web 应用程序之间进行调解。 有足够的信息可以找到文档并进行更新。

问题

由于转换问题，无法更新。
例外：Unable to create converter for type Models.Participant

问题

在尝试了几种解决方案（主要使用 json 转换）后，我简化了代码以便更好地掌握情况。我假设缺少一些明显的东西，但由于我对 firebase (firestore) 缺乏经验，我目前无法看到什么。

public async Task<bool> NextTurn(string encounterName)
{
    var encounterSnapshotQuery = await _encountersCollection.WhereEqualTo("name", encounterName).GetSnapshotAsync();

    foreach (DocumentSnapshot encounterSnapshot in encounterSnapshotQuery.Documents)
    {
        Dictionary<string, object> data = encounterSnapshot.ToDictionary();
        var name = data["name"].ToString();

        if (name == encounterName)
        {
            var participants = data["participants"].ToParticipants();
            var orderedParticipants = participants.OrderByDescending(x => x.initiative + x.roll).ToList();

            var current = orderedParticipants.Single(x => x.isCurrent != null && x.isCurrent is bool && (bool)x.isCurrent);
            var currentIndex = orderedParticipants.FindIndex(x => x.characterName == current.characterName);
            var next = orderedParticipants[currentIndex + 1];

            current.hasPlayedThisTurn = true;
            current.isCurrent = false;
            next.isCurrent = true;

            var updates = new Dictionary<FieldPath, object>
            {
                { new FieldPath("participants"),  orderedParticipants }
            };

            try
            {
                await encounterSnapshot.Reference.UpdateAsync(updates);
            }
            catch (Exception ex)
            {
                _logger.LogError(new EventId(), ex, "Update failed.");
            }
        }

    }

    return true;
}

如果方法有明显错误，也欢迎提出建议。

更新

完整的异常消息：

 at Google.Cloud.Firestore.Converters.ConverterCache.CreateConverter(Type targetType)
   at Google.Cloud.Firestore.Converters.ConverterCache.<>c.<GetConverter>b__1_0(Type t)
   at System.Collections.Concurrent.ConcurrentDictionary`2.GetOrAdd(TKey key, Func`2 valueFactory)
   at Google.Cloud.Firestore.Converters.ConverterCache.GetConverter(Type targetType)
   at Google.Cloud.Firestore.SerializationContext.GetConverter(Type targetType)
   at Google.Cloud.Firestore.ValueSerializer.Serialize(SerializationContext context, Object value)
   at Google.Cloud.Firestore.Converters.ListConverterBase.Serialize(SerializationContext context, Object value)
   at Google.Cloud.Firestore.ValueSerializer.Serialize(SerializationContext context, Object value)
   at Google.Cloud.Firestore.WriteBatch.<>c__DisplayClass12_0.<Update>b__1(KeyValuePair`2 pair)
   at System.Linq.Enumerable.ToDictionary[TSource,TKey,TElement](IEnumerable`1 source, Func`2 keySelector, Func`2 elementSelector, IEqualityComparer`1 comparer)
   at System.Linq.Enumerable.ToDictionary[TSource,TKey,TElement](IEnumerable`1 source, Func`2 keySelector, Func`2 elementSelector)
   at Google.Cloud.Firestore.WriteBatch.Update(DocumentReference documentReference, IDictionary`2 updates, Precondition precondition)
   at Google.Cloud.Firestore.DocumentReference.UpdateAsync(IDictionary`2 updates, Precondition precondition, CancellationToken cancellationToken)

参与者模型

public class Participant
{
    public string playerName { get; set; }
    public int experience { get; set; }
    public int level { get; set; }
    public string characterName { get; set; }
    public string playerUid { get; set; }
    public object joined { get; set; }
    public string type { get; set; }
    public object abilities { get; set; }
    public int roll { get; set; }
    public bool? isCurrent { get; set; }
    public int sizeModifier { get; set; }
    public int initiative { get; set; }
    public bool? hasPlayedThisTurn { get; set; }
    public string portraitUrl { get; set; }
}

用于在 Firestore 上创建模型的参与者打字稿界面

export interface Participant {
    playerName: string,
    characterName: string,
    initiative: number,
    roll: number,
    playerUid: string,
    joined: Date,
    portraitUrl: string,
    level: number,
    experience: number,
    isCurrent: boolean,
    sizeModifier: number,
    type: string,
    abilities: {
        strength: number,
        dexterity: number,
        constitution: number,
        intelligence: number,
        wisdom: number,
        charisma: number
    },
    hasPlayedThisTurn: boolean
}

请注意，我曾尝试更改 C# 模型以尝试解决此问题。这是当前的状态。不管我做了什么改变，消息都是一样的。

Answer 1

这里有两种解决方案：

1. 你需要用
装饰类

[FirestoreData]
public class Participant
{
    [FirestoreProperty]
    public string playerName { get; set; }

    [FirestoreProperty("playerExperience")] //you can give the properties custom names as well
    public int experience { get; set; }
 
    //so on
    public int level { get; set; }
    public string characterName { get; set; }
    public string playerUid { get; set; }
    public object joined { get; set; }
    public string type { get; set; }
    public object abilities { get; set; }
    public int roll { get; set; }
    public bool? isCurrent { get; set; }
    public int sizeModifier { get; set; }
    public int initiative { get; set; }
    public bool? hasPlayedThisTurn { get; set; }
    public string portraitUrl { get; set; }
}

或

通过将参与者转换为 ExpandoObject ExpandoObject Reference

建议在不使用 Newtonsoft.Json 的情况下转换对象： How do you convert any C# object to an ExpandoObject?

但是使用 Newtonsoft.Json 很容易理解，这就是我所做的：

var serializedParticipant = JsonConvert.SerializeObject(participant);
var deserializedParticipant = JsonConvert.DeserializeObject<ExpandoObject>(serializedParticipant);

//setting the document
await documentReference.UpdateAsync(deserializedParticipant);

然后将您的参与者更新为 ExpandoObject 而不是 Model.Participant