Add create author mutation

Resolves #2

Author: juffalow

README.md

@@ -81,6 +81,18 @@ query {
 }
 ```
 
+#### Add new author
+
+```graphql
+mutation {
+  createAuthor(input:{name:"Fredrick", last_name:"Brooks"}) {
+    id
+    name
+    last_name
+  }
+}
+```
+
 ## License
 
 [MIT license](./LICENSE)

composer.json

@@ -18,7 +18,9 @@
       "di\\": "di",
       "models\\": "models",
       "queries\\": "queries",
-      "types\\": "types"
+      "types\\": "types",
+      "inputTypes\\": "inputTypes",
+      "mutations\\": "mutations"
     }
   }
 }

inputTypes/Author.php

@@ -0,0 +1,33 @@
+<?php
+
+namespace inputTypes;
+
+use GraphQL\Type\Definition\Type;
+use GraphQL\Type\Definition\InputObjectType;
+
+class Author extends InputObjectType {
+  static $type = null;
+
+  public static function get() {
+    if (self::$type === null) {
+        self::$type = self::create();
+    }
+    return self::$type;
+  }
+
+  private static function create() {
+    return new InputObjectType([
+      'name' => 'AuthorInput',
+      'fields' => [
+        'name' => [
+          'type' => Type::nonNull(Type::string()),
+          'description' => 'Name of the author',
+        ],
+        'last_name' => [
+          'type' => Type::nonNull(Type::string()),
+          'description' => 'Last name of the author',
+        ]
+      ]
+    ]);
+  }
+}

mutations/CreateAuthor.php

@@ -0,0 +1,32 @@
+<?php
+
+namespace mutations;
+
+use GraphQL\Type\Definition\ObjectType;
+use GraphQL\Type\Definition\Type;
+
+use types\Author as AuthorType;
+use inputTypes\Author as AuthorInputType;
+use models\Author As AuthorModel;
+
+class CreateAuthor {
+  public static function get() {
+    return [
+      'type' => AuthorType::get(),
+      'args' => [
+        'input' => AuthorInputType::get(),
+      ],
+      'resolve' => function ($root, $args, $context) {
+        $input = $args['input'];
+
+        $author = new AuthorModel();
+        $author->name = $input['name'];
+        $author->last_name = $input['last_name'];
+
+        $author->save();
+
+        return $author;
+      }
+    ];
+  }
+}

schema/schema.php

@@ -8,6 +8,8 @@
 use queries\Quote as QuoteQuery;
 use queries\Quotes as QuotesQuery;
 
+use mutations\CreateAuthor as CreateAuthorMutation;
+
 return new Schema([
   'query' => new ObjectType([
     'name' => 'Query',
@@ -17,5 +19,11 @@
       'quote' => QuoteQuery::get(),
       'quotes' => QuotesQuery::get(),
     ]
-  ])
+  ]),
+  'mutation' => new ObjectType([
+    'name' => 'Mutation',
+    'fields' => [
+        'createAuthor' => CreateAuthorMutation::get(),
+    ]
+])
 ]);