Fixed ModifyCommandPermissions Invalid Form Body error (#55)

src/Discord.Net.Rest/API/Rest/ModifyGuildApplicationCommandPermissionsParams.cs

@@ -0,0 +1,15 @@
+using Newtonsoft.Json;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Discord.API.Rest
+{
+    internal class ModifyGuildApplicationCommandPermissionsParams
+    {
+        [JsonProperty("permissions")]
+        public ApplicationCommandPermissions[] Permissions { get; set; }
+    }
+}

src/Discord.Net.Rest/DiscordRestApiClient.cs

@@ -1004,7 +1004,7 @@ namespace Discord.API
             return await SendAsync<GuildApplicationCommandPermission>("GET", () => $"applications/{this.CurrentUserId}/guilds/{guildId}/commands/{commandId}/permissions", new BucketIds(), options: options).ConfigureAwait(false);
         }
 
-        public async Task<GuildApplicationCommandPermission> ModifyApplicationCommandPermissions(ApplicationCommandPermissions[] permissions, ulong guildId, ulong commandId, RequestOptions options = null)
+        public async Task<GuildApplicationCommandPermission> ModifyApplicationCommandPermissions(ModifyGuildApplicationCommandPermissionsParams permissions, ulong guildId, ulong commandId, RequestOptions options = null)
         {
             Preconditions.NotEqual(guildId, 0, nameof(guildId));
             Preconditions.NotEqual(commandId, 0, nameof(commandId));

src/Discord.Net.Rest/Entities/Interactions/InteractionHelper.cs

@@ -377,21 +377,26 @@ namespace Discord.Rest
             Preconditions.AtMost(args.Length, 10, nameof(args));
             Preconditions.GreaterThan(args.Length, 0, nameof(args));
 
-            List<ApplicationCommandPermissions> models = new List<ApplicationCommandPermissions>();
+            List<ApplicationCommandPermissions> permissionsList = new List<ApplicationCommandPermissions>();
 
             foreach (var arg in args)
             {
-                var model = new ApplicationCommandPermissions()
+                var permissions = new ApplicationCommandPermissions()
                 {
                     Id = arg.TargetId,
                     Permission = arg.Permission,
                     Type = arg.TargetType
                 };
 
-                models.Add(model);
+                permissionsList.Add(permissions);
             }
 
-            var apiModel = await client.ApiClient.ModifyApplicationCommandPermissions(models.ToArray(), guildId, commandId, options);
+            ModifyGuildApplicationCommandPermissionsParams model = new ModifyGuildApplicationCommandPermissionsParams()
+            {
+                Permissions = permissionsList.ToArray()
+            };
+
+            var apiModel = await client.ApiClient.ModifyApplicationCommandPermissions(model, guildId, commandId, options);
 
             return new GuildApplicationCommandPermission(apiModel.Id, apiModel.ApplicationId, guildId, apiModel.Permissions.Select(
                 x => new ApplicationCommandPermission(x.Id, x.Type, x.Permission)).ToArray());