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Update queries doc and add fields to tutorial
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docs/queries.rst
148
docs/queries.rst
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@ -24,24 +24,22 @@ Full example
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from .models import Question
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class QuestionType(DjangoObjectType):
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class Meta:
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model = Question
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fields = '__all__'
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fields = ("id", "question_text")
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class Query:
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class Query(graphene.ObjectType):
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questions = graphene.List(QuestionType)
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question = graphene.Field(QuestionType, question_id=graphene.String())
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question_by_id = graphene.Field(QuestionType, id=graphene.String())
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def resolve_questions(root, info, **kwargs):
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# Querying a list
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return Question.objects.all()
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def resolve_question(root, info, question_id):
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def resolve_question_by_id(root, info, id):
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# Querying a single question
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return Question.objects.get(pk=question_id)
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return Question.objects.get(pk=id)
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Specifying which fields to include
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@ -61,21 +59,27 @@ Show **only** these fields on the model:
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.. code:: python
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from graphene_django import DjangoObjectType
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from .models import Question
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class QuestionType(DjangoObjectType):
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class Meta:
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model = Question
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fields = ('id', 'question_text')
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fields = ("id", "question_text")
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You can also set the ``fields`` attribute to the special value ``'__all__'`` to indicate that all fields in the model should be used.
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You can also set the ``fields`` attribute to the special value ``"__all__"`` to indicate that all fields in the model should be used.
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For example:
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.. code:: python
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from graphene_django import DjangoObjectType
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from .models import Question
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class QuestionType(DjangoObjectType):
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class Meta:
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model = Question
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fields = '__all__'
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fields = "__all__"
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``exclude``
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@ -85,10 +89,13 @@ Show all fields **except** those in ``exclude``:
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.. code:: python
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from graphene_django import DjangoObjectType
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from .models import Question
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class QuestionType(DjangoObjectType):
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class Meta:
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model = Question
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exclude = ('question_text',)
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exclude = ("question_text",)
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Customising fields
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@ -98,16 +105,19 @@ You can completely overwrite a field, or add new fields, to a ``DjangoObjectType
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.. code:: python
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from graphene_django import DjangoObjectType
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from .models import Question
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class QuestionType(DjangoObjectType):
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class Meta:
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model = Question
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fields = ('id', 'question_text')
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fields = ("id", "question_text")
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extra_field = graphene.String()
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def resolve_extra_field(self, info):
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return 'hello!'
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return "hello!"
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Choices to Enum conversion
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@ -122,12 +132,19 @@ For example the following ``Model`` and ``DjangoObjectType``:
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.. code:: python
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class PetModel(models.Model):
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kind = models.CharField(max_length=100, choices=(('cat', 'Cat'), ('dog', 'Dog')))
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from django.db import models
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from graphene_django import DjangoObjectType
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class Pet(DjangoObjectType):
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class Meta:
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model = PetModel
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class PetModel(models.Model):
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kind = models.CharField(
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max_length=100,
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choices=(("cat", "Cat"), ("dog", "Dog"))
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)
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class Pet(DjangoObjectType):
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class Meta:
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model = PetModel
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fields = ("id", "kind",)
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Results in the following GraphQL schema definition:
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@ -149,27 +166,35 @@ You can disable this automatic conversion by setting
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.. code:: python
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class Pet(DjangoObjectType):
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class Meta:
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model = PetModel
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convert_choices_to_enum = False
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from graphene_django import DjangoObjectType
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from .models import PetModel
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class Pet(DjangoObjectType):
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class Meta:
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model = PetModel
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fields = ("id", "kind",)
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convert_choices_to_enum = False
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.. code::
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type Pet {
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id: ID!
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kind: String!
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}
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type Pet {
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id: ID!
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kind: String!
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}
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You can also set ``convert_choices_to_enum`` to a list of fields that should be
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automatically converted into enums:
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.. code:: python
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class Pet(DjangoObjectType):
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class Meta:
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model = PetModel
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convert_choices_to_enum = ['kind']
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from graphene_django import DjangoObjectType
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from .models import PetModel
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class Pet(DjangoObjectType):
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class Meta:
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model = PetModel
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fields = ("id", "kind",)
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convert_choices_to_enum = ["kind"]
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**Note:** Setting ``convert_choices_to_enum = []`` is the same as setting it to
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``False``.
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@ -182,6 +207,8 @@ Say you have the following models:
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.. code:: python
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from django.db import models
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class Category(models.Model):
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foo = models.CharField(max_length=256)
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@ -193,10 +220,13 @@ When ``Question`` is published as a ``DjangoObjectType`` and you want to add ``C
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.. code:: python
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from graphene_django import DjangoObjectType
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from .models import Question
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class QuestionType(DjangoObjectType):
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class Meta:
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model = Question
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fields = ('category',)
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fields = ("category",)
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Then all query-able related models must be defined as DjangoObjectType subclass,
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or they will fail to show if you are trying to query those relation fields. You only
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@ -204,9 +234,13 @@ need to create the most basic class for this to work:
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.. code:: python
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from graphene_django import DjangoObjectType
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from .models import Category
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class CategoryType(DjangoObjectType):
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class Meta:
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model = Category
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fields = ("foo",)
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.. _django-objecttype-get-queryset:
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@ -221,7 +255,6 @@ Use this to control filtering on the ObjectType level instead of the Query objec
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from graphene_django.types import DjangoObjectType
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from .models import Question
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class QuestionType(DjangoObjectType):
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class Meta:
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model = Question
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@ -241,18 +274,22 @@ This resolve method should follow this format:
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.. code:: python
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def resolve_foo(self, info, **kwargs):
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def resolve_foo(parent, info, **kwargs):
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Where "foo" is the name of the field declared in the ``Query`` object.
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.. code:: python
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class Query:
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import graphene
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from .models import Question
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from .types import QuestionType
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class Query(graphene.ObjectType):
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foo = graphene.List(QuestionType)
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def resolve_foo(self, info, **kwargs):
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id = kwargs.get('id')
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return QuestionModel.objects.get(id)
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def resolve_foo(root, info):
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id = kwargs.get("id")
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return Question.objects.get(id)
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Arguments
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~~~~~~~~~
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@ -261,10 +298,18 @@ Additionally, Resolvers will receive **any arguments declared in the field defin
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.. code:: python
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class Query:
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question = graphene.Field(Question, foo=graphene.String(), bar=graphene.Int())
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import graphene
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from .models import Question
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from .types import QuestionType
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def resolve_question(self, info, foo, bar):
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class Query(graphene.ObjectType):
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question = graphene.Field(
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QuestionType,
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foo=graphene.String(),
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bar=graphene.Int()
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)
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def resolve_question(root, info, foo, bar):
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# If `foo` or `bar` are declared in the GraphQL query they will be here, else None.
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return Question.objects.filter(foo=foo, bar=bar).first()
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@ -279,7 +324,15 @@ of Django's ``HTTPRequest`` in your resolve methods, such as checking for authen
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.. code:: python
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def resolve_questions(self, info, **kwargs):
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import graphene
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from .models import Question
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from .types import QuestionType
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class Query(graphene.ObjectType):
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questions = graphene.List(QuestionType)
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def resolve_questions(root, info):
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# See if a user is authenticated
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if info.context.user.is_authenticated():
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return Question.objects.all()
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@ -306,15 +359,13 @@ Django models and your external API.
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import graphene
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from .models import Question
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class MyQuestion(graphene.ObjectType):
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text = graphene.String()
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class Query:
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class Query(graphene.ObjectType):
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question = graphene.Field(MyQuestion, question_id=graphene.String())
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def resolve_question(self, info, question_id):
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def resolve_question(root, info, question_id):
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question = Question.objects.get(pk=question_id)
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return MyQuestion(
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text=question.question_text
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@ -344,25 +395,22 @@ the core graphene pages for more information on customizing the Relay experience
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from graphene_django import DjangoObjectType
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from .models import Question
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class QuestionType(DjangoObjectType):
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class Meta:
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model = Question
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interfaces = (relay.Node,)
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interfaces = (relay.Node,) # make sure you add this
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fields = "__all__"
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class QuestionConnection(relay.Connection):
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class Meta:
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node = QuestionType
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class Query:
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questions = relay.ConnectionField(QuestionConnection)
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def resolve_questions(root, info, **kwargs):
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return Question.objects.all()
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You can now execute queries like:
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@ -150,12 +150,12 @@ Create ``cookbook/schema.py`` and type the following:
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class CategoryType(DjangoObjectType):
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class Meta:
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model = Category
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fields = "__all__" # Convert all of the Django model fields on the GraphQL type
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fields = ("id", "name", "ingredients")
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class IngredientType(DjangoObjectType):
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class Meta:
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model = Ingredient
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fields = "__all__"
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fields = ("id", "name", "notes", "category")
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class Query(graphene.ObjectType):
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all_ingredients = graphene.List(IngredientType)
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