feat(dotnet-sdk): add write conflict resolution options

config/clients/dotnet/CHANGELOG.md.mustache

@@ -7,19 +7,26 @@
   - per-request headers support via `Headers` property on all client options classes
   - `IRequestOptions` interface and `RequestOptions` class for API-level header support
   - `IClientRequestOptions` interface and `ClientRequestOptions` class for client-level header support
-  - add header validation to prevent overiding of reserved headers
+  - add header validation to prevent overriding of reserved headers
+- feat: add write conflict resolution options
+  - `ConflictOptions` to control behavior for duplicate writes and missing deletes
+  - `OnDuplicateWrites` option: `Error` (default) or `Ignore` for handling duplicate tuple writes
+  - `OnMissingDeletes` option: `Error` (default) or `Ignore` for handling missing tuple deletes
+  - Available in `ClientWriteOptions.Conflict` property
 
 [!WARNING]
 BREAKING CHANGES:
 
 - **OpenFgaApi methods**: All API methods now accept an `IRequestOptions? options` parameter. If you are using the low-level `OpenFgaApi` directly, you may need to update your calls:
 
   Before:
+
   ```csharp
   await api.Check(storeId, body, cancellationToken);
   ```
 
   After:
+
   ```csharp
   var options = new RequestOptions {
       Headers = new Dictionary<string, string> { { "X-Custom-Header", "value" } }
@@ -30,11 +37,13 @@ BREAKING CHANGES:
 - **ClientRequestOptions renamed**: The base client request options interface has been renamed from `ClientRequestOptions` to `IClientRequestOptions` to better follow .NET naming conventions. A concrete `ClientRequestOptions` class is now also available. If you were casting to or implementing this interface, update your code:
 
   Before:
+
   ```csharp
   var options = obj as ClientRequestOptions;
   ```
 
   After:
+
   ```csharp
   var options = obj as IClientRequestOptions;
   ```

config/clients/dotnet/template/Client/Client.mustache

@@ -212,6 +212,20 @@ public class {{appShortName}}Client : IDisposable {
         return authorizationModelId;
     }
 
+    private static WriteRequestWrites.OnDuplicateEnum MapOnDuplicateWrites(OnDuplicateWrites? behavior) {
+        if (behavior == null) return WriteRequestWrites.OnDuplicateEnum.Error;
+        return behavior.Value == OnDuplicateWrites.Error
+            ? WriteRequestWrites.OnDuplicateEnum.Error
+            : WriteRequestWrites.OnDuplicateEnum.Ignore;
+    }
+
+    private static WriteRequestDeletes.OnMissingEnum MapOnMissingDeletes(OnMissingDeletes? behavior) {
+        if (behavior == null) return WriteRequestDeletes.OnMissingEnum.Error;
+        return behavior.Value == OnMissingDeletes.Error
+            ? WriteRequestDeletes.OnMissingEnum.Error
+            : WriteRequestDeletes.OnMissingEnum.Ignore;
+    }
+
     /**********
      * Stores *
      **********/
@@ -341,10 +355,16 @@ public class {{appShortName}}Client : IDisposable {
                 AuthorizationModelId = authorizationModelId
             };
             if (body.Writes?.Count > 0) {
-                requestBody.Writes = new WriteRequestWrites(body.Writes.ConvertAll(key => key.ToTupleKey()));
+                requestBody.Writes = new WriteRequestWrites(
+                    body.Writes.ConvertAll(key => key.ToTupleKey()),
+                    MapOnDuplicateWrites(options?.Conflict?.OnDuplicateWrites)
+                );
             }
             if (body.Deletes?.Count > 0) {
-                requestBody.Deletes = new WriteRequestDeletes(body.Deletes.ConvertAll(key => key.ToTupleKeyWithoutCondition()));
+                requestBody.Deletes = new WriteRequestDeletes(
+                    body.Deletes.ConvertAll(key => key.ToTupleKeyWithoutCondition()),
+                    MapOnMissingDeletes(options?.Conflict?.OnMissingDeletes)
+                );
             }
 
             await api.Write(GetStoreId(options), requestBody, options, cancellationToken);
@@ -360,7 +380,12 @@ public class {{appShortName}}Client : IDisposable {
             };
         }
 
-        var clientWriteOpts = new ClientWriteOptions() { StoreId = StoreId, AuthorizationModelId = authorizationModelId, Headers = options?.Headers };
+        var clientWriteOpts = new ClientWriteOptions() {
+            StoreId = GetStoreId(options),
+            AuthorizationModelId = authorizationModelId,
+            Headers = options?.Headers,
+            Conflict = options?.Conflict
+        };
 
         var writeChunks = body.Writes?.Chunk(maxPerChunk).ToList() ?? new List<ClientTupleKey[]>();
         var writeResponses = new ConcurrentBag<ClientWriteSingleResponse>();

config/clients/dotnet/template/Client/Model/ClientWriteOptions.mustache

@@ -1,9 +1,67 @@
 {{>partial_header}}
 
+using {{packageName}}.Model;
 using System.Collections.Generic;
 
 namespace {{packageName}}.Client.Model;
 
+/// <summary>
+///     Behavior for handling duplicate tuple writes
+/// </summary>
+public enum OnDuplicateWrites {
+    /// <summary>
+    ///     Return an error when attempting to write a tuple that already exists (default)
+    /// </summary>
+    Error = 1,
+
+    /// <summary>
+    ///     Silently ignore duplicate tuple writes (no-op)
+    /// </summary>
+    Ignore = 2
+}
+
+/// <summary>
+///     Behavior for handling missing tuple deletes
+/// </summary>
+public enum OnMissingDeletes {
+    /// <summary>
+    ///     Return an error when attempting to delete a tuple that doesn't exist (default)
+    /// </summary>
+    Error = 1,
+
+    /// <summary>
+    ///     Silently ignore missing tuple deletes (no-op)
+    /// </summary>
+    Ignore = 2
+}
+
+/// <summary>
+///     ConflictOptions - Controls behavior for duplicate writes and missing deletes
+/// </summary>
+public interface IConflictOptions {
+    /// <summary>
+    ///     Controls behavior when writing a tuple that already exists
+    /// </summary>
+    OnDuplicateWrites? OnDuplicateWrites { get; set; }
+
+    /// <summary>
+    ///     Controls behavior when deleting a tuple that doesn't exist
+    /// </summary>
+    OnMissingDeletes? OnMissingDeletes { get; set; }
+}
+
+public class ConflictOptions : IConflictOptions {
+    /// <summary>
+    ///     Controls behavior when writing a tuple that already exists
+    /// </summary>
+    public OnDuplicateWrites? OnDuplicateWrites { get; set; }
+
+    /// <summary>
+    ///     Controls behavior when deleting a tuple that doesn't exist
+    /// </summary>
+    public OnMissingDeletes? OnMissingDeletes { get; set; }
+}
+
 /// <summary>
 ///     TransactionOpts
 /// </summary>
@@ -43,6 +101,7 @@ public class TransactionOptions : ITransactionOpts {
 
 public interface IClientWriteOptions : IClientRequestOptionsWithAuthZModelId {
     ITransactionOpts Transaction { get; set; }
+    IConflictOptions? Conflict { get; set; }
 }
 
 public class ClientWriteOptions : IClientWriteOptions {
@@ -57,6 +116,9 @@ public class ClientWriteOptions : IClientWriteOptions {
     /// <inheritdoc />
     public ITransactionOpts Transaction { get; set; }
 
+    /// <inheritdoc />
+    public IConflictOptions? Conflict { get; set; }
+
     /// <inheritdoc />
     public IDictionary<string, string>? Headers { get; set; }
 }