1. # ...
2.  
3. class CategoryInput(graphene.InputObjectType):
4.     id = graphene.ID()
5.     name = graphene.String()
6.  
7.  
8. class TechnologyInput(graphene.InputObjectType):
9.     id = graphene.ID()
10.     name = graphene.String()
11.  
12.  
13. class ProjectInput(graphene.InputObjectType):
14.     title = graphene.String()
15.     text = graphene.String()
16.     category = graphene.Field(CategoryInput)
17.     technologies = graphene.List(TechnologyInput)
18.  
19.  
20. class CreateProject(graphene.Mutation):
21.  
22.     class Arguments:
23.         project_data = ProjectInput()
24.  
25.     id = graphene.Int()
26.     created_date = graphene.DateTime()
27.     owner = graphene.Field(UserType)
28.  
29.     project = graphene.Field(ProjectType)
30.  
31.     def mutate(self, info, project_data):
32.         user = info.context.user
33.         if user.is_anonymous:
34.             raise Exception('You must be logged in to make projects!')
35.  
36.         category = Category.objects.filter(id=project_data.category.id).first()
37.         if not category:
38.             raise Exception('Invalid category ID!')
39.  
40.         technologies = []
41.         for technologies_data in project_data.technologies:
42.             technology = Technology.objects.get(id=technologies_data.id)
43.             if technology is None:
44.                 raise Exception('Invalid technology ID!')
45.             technologies.append(technology)
46.  
47.         project_instance = Project(owner_id=user.id, title=project_data.title, text=project_data.text,
48.                                    category=category)
49.         project_instance.save()
50.         project_instance.technologies.set(technologies)
51.  
52.         return CreateProject
53.