• Igor Davydenko
• Python / JavaScript developer
• Have 2 projects with GraphQL at production

• What is GraphQL? GraphiQL?
• GraphQL & Python
• Django Graphene
• Migragion itself
• Advanced topics

• Describe your data
• Make query
• Get predictable results

• Get many resources in one request
• Evolve your API without versions
• Powerful developer tools

{
  allTeams {
    nodes {
      name
      slug
      conferenceSlug
    }
  }
}

{
  teams: allTeams(condition: {conferenceSlug: "afc"}, orderBy: NAME_ASC) {
    nodes {
      name
      slug
    }
  }
}

query conferenceTeams($slug: String!) {
  teams: allTeams(condition: {conferenceSlug: $slug}, orderBy: NAME_ASC) {
    nodes {
      ...TeamDetails
      divisionSlug
    }
  }
}

fragment TeamDetails on Team {
  name
  slug
}

{
  currentSeason: seasonByYear(year: 2018) {
    ...SeasonDetails
  }
  tweets: allTweets {
    nodes {
      ...TweetDetails
    }
  }
  teams: allTeams {
    nodes {
      ...TeamDetails
    }
  }
}

from graphene_django.types import DjangoObjectType

from .models import Category


class CategoryType(DjangoObjectType):
    class Meta:
        model = Category

class Query(object):
    all_categories = graphene.List(CategoryType)

    def resolve_all_categories(self, info, **kwargs):
        return Category.objects.all()

from graphene import ObjectType

from app.schema import Query as AppQuery

class Query(AppQuery, ObjectType):
    pass

schema = graphene.Schema(query=Query)

INSTALLED_APPS = [
    ...,
    'graphene_django',
]
...
GRAPHENE = {
    'SCHEMA': 'project.schema.schema',
}

from graphene_django.views import GraphQLView

urlpatterns = [
    url(r'^graphql', GraphQLView.as_view(graphiql=True)),
]

• Interface (abstract Node) is Interface
• Node is ObjectType or DjangoObjectType
• Query is object

• Enums
• Scalars (strings, ints, floats, booleans, ID, dates, datetimes, times, JSON strings) + Custom scalars
• Lists (and not-null lists)
• Unions

• Field resolvers
• Middleware resolvers
• Dataloader

You can use Django REST Framework serializer for mutations in GraphQL

• PrivateGraphQLView
• Specify fields to use (only, exclude)
• User-based query filtering via field resolver
• Filtering ID-based node access
• Setting up authentication in middleware

• Create / update models via GraphQL
• Can be integrated with Django Forms as well

- Use base64, Luke
- But why…