结合DjangoObjectType和ObjectType [英] Combine DjangoObjectType and ObjectType
问题描述
我有一个简单的django模型,其计算所得的属性字段为 clicks
.该模型如下所示:
I have a simple django model with a calculated property field clicks
. The model looks like this:
class Link(models.Model):
url = models.URLField()
@property
def clicks(self):
"""
Property does some calculations and returns a list of dictionaries:
"""
# removed calculation for simplicity
return [{'dt': 1, 'clicks': 100}, {'dt': 2, 'clicks': 201}]
我想在我的graphql端点中使该模型可访问.因此,我创建了以下类型和查询:
I want to make this model accesible in my graphql endpoint. So I created the following Types and Query:
class Stats(graphene.ObjectType):
clicks = graphene.String()
dt = graphene.String()
class LinkType(DjangoObjectType):
clicks = graphene.List(Stats, source='clicks')
class Meta:
model = Link
class Query(object):
link = graphene.Field(LinkType, id=graphene.Int())
def resolve_link(self, info, **kwargs):
id = kwargs.get('id')
url = kwargs.get('url')
if id is not None:
return Link.objects.get(pk=id)
return None
现在,我应该能够在我的graphql资源管理器中使用以下查询:
Now I should be able to use the following query in my graphql explorer:
{
link(id: 3) {
id,
url,
clicks{
clicks,
dt
}
}
}
我的预期结果将是这样:
My expected result would be like this:
{
id: 3,
url: "www.google.de",
clicks: [
dt: 1, clicks: 100},
dt: 2, clicks: 201}
]
}
但是 clicks
和 dt
的嵌套值为 null
:
{
id: 3,
url: "www.google.de",
clicks: [
dt: null, clicks: null},
dt: null, clicks: null}
]
}
那么我在这里做错了什么?如何将字典列表转换为石墨烯中的ObjectType?
So what am I doing wrong here? How can I convert a list of dicts to an ObjectType in graphene?
我使用了@ mark-chackerian答案的修改版本来解决此问题:似乎我对石墨烯的期望太高了,我必须明确地告诉它如何解决每个字段.
I used a modified version of @mark-chackerian answer to solve the problem: Seems like I was expecting too much "magic" from graphene and I have to explicitly tell it how every field is resolved.
class Stats(graphene.ObjectType):
clicks = graphene.String()
dt = graphene.String()
def resolve_clicks(self, info):
return self['clicks']
def resolve_dt(self, info):
return self['dt']
推荐答案
您必须更明确地告诉石墨烯如何制作 Stats
对象的列表.
You have to tell graphene more explicitly how to make your list of Stats
objects.
尝试这样的事情:
class LinkType(DjangoObjectType):
clicks = graphene.List(Stats)
class Meta:
model = Link
def resolve_clicks(self, info):
return [Stats(dt=click_dict['dt'], clicks=click_dict['clicks') for click_dict in self.clicks]
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