Adding mutation

Demo.Azure.Functions.GraphQL/Schema/Mutations/StarWarsMutation.cs

@@ -0,0 +1,39 @@
+using System;
+using Microsoft.Azure.Documents;
+using Microsoft.Azure.Documents.Client;
+using GraphQL.Types;
+using Demo.Azure.Functions.GraphQL.Documents;
+using Demo.Azure.Functions.GraphQL.Schema.Types;
+using Demo.Azure.Functions.GraphQL.Infrastructure;
+
+namespace Demo.Azure.Functions.GraphQL.Schema.Mutations
+{
+    internal class StarWarsMutation : ObjectGraphType
+    {
+        private const string HOMEWORLD_MUTATION_ARGUMENT = "homeworld";
+        private const string CHARACTER_MUTATION_ARGUMENT = "character";
+
+        private static readonly Uri _charactersCollectionUri = UriFactory.CreateDocumentCollectionUri(Constants.DATABASE_NAME, Constants.CHARACTERS_COLLECTION_NAME);
+
+        public StarWarsMutation(IDocumentClient documentClient)
+        {
+            FieldAsync<CharacterType>(
+                "createCharacter",
+                arguments: new QueryArguments(
+                    new QueryArgument<NonNullGraphType<IntGraphType>> { Name = HOMEWORLD_MUTATION_ARGUMENT },
+                    new QueryArgument<NonNullGraphType<CharacterCreationType>> { Name = CHARACTER_MUTATION_ARGUMENT }
+                ),
+                resolve: async context =>
+                {
+                    Character character = context.GetArgument<Character>(CHARACTER_MUTATION_ARGUMENT);
+                    character.HomeworldId = context.GetArgument<int>(HOMEWORLD_MUTATION_ARGUMENT);
+                    character.CharacterId = Guid.NewGuid().ToString("N");
+
+                    await documentClient.CreateDocumentAsync(_charactersCollectionUri, character);
+
+                    return character;
+                }
+            );
+        }
+    }
+}

Demo.Azure.Functions.GraphQL/Schema/StarWarsSchema.cs

@@ -1,6 +1,7 @@
 using GraphQL;
 using GraphQLSchema = global::GraphQL.Types.Schema;
 using Demo.Azure.Functions.GraphQL.Schema.Queries;
+using Demo.Azure.Functions.GraphQL.Schema.Mutations;
 
 namespace Demo.Azure.Functions.GraphQL.Schema
 {
@@ -10,6 +11,7 @@ public StarWarsSchema(IDependencyResolver dependencyResolver)
             : base(dependencyResolver)
         {
             Query = dependencyResolver.Resolve<StarWarsQuery>();
+            Mutation = dependencyResolver.Resolve<StarWarsMutation>();
         }
     }
 }

Demo.Azure.Functions.GraphQL/Schema/Types/CharacterCreationType.cs

@@ -0,0 +1,14 @@
+using GraphQL.Types;
+using Demo.Azure.Functions.GraphQL.Documents;
+
+namespace Demo.Azure.Functions.GraphQL.Schema.Types
+{
+    internal class CharacterCreationType: InputObjectGraphType
+    {
+        public CharacterCreationType()
+        {
+            Field<NonNullGraphType<StringGraphType>>(nameof(Character.Name));
+            Field<StringGraphType>(nameof(Character.BirthYear));
+        }
+    }
+}

README.md

@@ -3,6 +3,7 @@
 Sample project for demonstrating GraphQL in Azure Functions. You can read more here:
 
 - [Serverless GraphQL with Azure Functions, GraphQL for .NET, and Cosmos DB](https://www.tpeczek.com/2019/05/serverless-graphql-with-azure-functions.html)
+- [More Performant Serverless GraphQL with Azure Functions, GraphQL for .NET, and Cosmos DB](https://www.tpeczek.com/2020/05/more-performant-serverless-graphql-with.html)
 
 ## Donating