Improve quickstart page to more involved example

quickstart.md

@@ -33,20 +33,59 @@ pip install graphene
 
 ## Types
 
-First we're going to define some GraphQL ObjectTypes for our `Schema`:
+First we're going to define some GraphQL ObjectTypes and relay Nodes for our `Schema`:
 
 
 ```python
 import graphene
+from graphene import relay
+from somewhere import (fetch_user_from_database, fetch_users_from_database)
 
 schema = graphene.Schema()
 
+class User(relay.Node):
+    """A User fetched from the database"""
+    user_id = graphene.ID()
+    first_name = graphene.String()
+    last_name = graphene.String()
+    full_name = graphene.String(description='A field created by setting the first and last name.')
+    email_address = graphene.String()
+    age = graphene.Int()
+
+    @classmethod
+    def get_node(cls, user_id):
+        user_dict = fetch_user_from_database(user_id)
+        # user_dict will contain the fields, user_id, first_name, last_name, email_address and age
+        user_dict['id'] = user_dict['user_id'] # will be used to set the global ID used by relay
+        return User(**user_dict)
+
+    def resolve_full_name(self, *args):
+        if self.first_name and self.last_name:
+            return self.first_name + ' ' + self.last_name
+        return None
+
+def _create_relay_user(user):
+    # user_dict will contain the fields, user_id, first_name, last_name, email_address and age
+    user['id'] = user['user_id']
+    return User(**user)
+
 # This will be our root query
 class Query(graphene.ObjectType):
-    username = graphene.StringField(description='The username')
+        users = graphene.List(User,
+                            userName=graphene.Argument(graphene.String),
+                            sortKey=graphene.Argument(graphene.String),
+                            sortDirection=graphene.Argument(graphene.String))
+        user = relay.NodeField(Users)
+        viewer = graphene.Field('self') # needed for Relay
+        
+        # args will be a dict with 'userName', 'sortKey' and 'sortDirection'
+        # info is an object with information about the query being sent
+        def resolve_users(self, args, info):
+            list_of_user_dicts = fetch_users_from_database(args)
+            return [_create_relay_user(user) for user in list_of_user_dicts]
 
-   	def resolve_username(self, *args):
-   		return 'Hello World'
+        def resolve_viewer(self, *args, **kwargs):
+            return self
 
 # Here we set the root query for our schema
 schema.query = Query
@@ -55,12 +94,12 @@ schema.query = Query
 Then, we can start querying our schema:
 
 ```python
-result = schema.execute('{ username }')
+result = schema.execute('query { users { fullName } }')
 
-# result.data should be {'username': 'Hello World'}
-username = result.data['username']
+# result.data should be {'users': [{fullName: 'Provided Name'}]}
+users = result.data['users']
 
-print(username)
+print(users)
 ```
 
 Congrats! You got your first version of graphene working!