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https://github.com/graphql-python/graphene-django.git
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Support Connections created from Promises
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@ -2,6 +2,8 @@ from functools import partial
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from django.db.models.query import QuerySet
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from promise import Promise
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from graphene.types import Field, List
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from graphene.relay import ConnectionField, PageInfo
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from graphql_relay.connection.arrayconnection import connection_from_list_slice
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@ -84,6 +86,7 @@ class DjangoConnectionField(ConnectionField):
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args['last'] = min(last, max_limit)
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iterable = resolver(root, args, context, info)
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iterable = Promise.resolve(iterable).get()
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if iterable is None:
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iterable = default_manager
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iterable = maybe_queryset(iterable)
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@ -545,3 +545,146 @@ def test_should_error_if_first_is_greater_than_max():
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assert result.data == expected
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graphene_settings.RELAY_CONNECTION_ENFORCE_FIRST_OR_LAST = False
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def test_should_query_promise_connectionfields():
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from promise import Promise
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class ReporterType(DjangoObjectType):
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class Meta:
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model = Reporter
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interfaces = (Node, )
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class Query(graphene.ObjectType):
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all_reporters = DjangoConnectionField(ReporterType)
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def resolve_all_reporters(self, *args, **kwargs):
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return Promise.resolve([Reporter(id=1)])
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schema = graphene.Schema(query=Query)
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query = '''
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query ReporterPromiseConnectionQuery {
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allReporters(first: 1) {
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edges {
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node {
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id
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}
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}
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}
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}
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'''
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expected = {
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'allReporters': {
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'edges': [{
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'node': {
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'id': 'UmVwb3J0ZXJUeXBlOjE='
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}
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}]
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}
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}
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result = schema.execute(query)
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assert not result.errors
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assert result.data == expected
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def test_should_query_dataloader_fields():
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from promise import Promise
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from promise.dataloader import DataLoader
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def article_batch_load_fn(keys):
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queryset = Article.objects.filter(reporter_id__in=keys)
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return Promise.resolve([
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[article for article in queryset if article.reporter_id == id]
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for id in keys
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])
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article_loader = DataLoader(article_batch_load_fn)
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class ArticleType(DjangoObjectType):
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class Meta:
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model = Article
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interfaces = (Node, )
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class ReporterType(DjangoObjectType):
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class Meta:
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model = Reporter
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interfaces = (Node, )
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articles = DjangoConnectionField(ArticleType)
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def resolve_articles(self, *args, **kwargs):
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return article_loader.load(self.id)
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class Query(graphene.ObjectType):
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all_reporters = DjangoConnectionField(ReporterType)
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r = Reporter.objects.create(
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first_name='John',
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last_name='Doe',
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email='johndoe@example.com',
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a_choice=1
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)
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Article.objects.create(
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headline='Article Node 1',
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pub_date=datetime.date.today(),
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reporter=r,
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editor=r,
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lang='es'
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)
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Article.objects.create(
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headline='Article Node 2',
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pub_date=datetime.date.today(),
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reporter=r,
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editor=r,
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lang='en'
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)
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schema = graphene.Schema(query=Query)
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query = '''
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query ReporterPromiseConnectionQuery {
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allReporters(first: 1) {
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edges {
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node {
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id
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articles(first: 2) {
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edges {
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node {
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headline
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}
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}
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}
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}
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}
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}
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}
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'''
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expected = {
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'allReporters': {
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'edges': [{
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'node': {
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'id': 'UmVwb3J0ZXJUeXBlOjE=',
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'articles': {
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'edges': [{
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'node': {
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'headline': 'Article Node 1',
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}
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}, {
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'node': {
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'headline': 'Article Node 2'
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}
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}]
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}
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}
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}]
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}
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}
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result = schema.execute(query)
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assert not result.errors
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assert result.data == expected
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