Django REST Serializers - passing a value when creating a new object - django

Question

I'm having problems in passing an argument when creating an object with Django REST serializers.
models.py
class Project(models.Model):
name = models.CharField(max_length=200, unique=False)
description = models.TextField()
...
class Hypothesis(models.Model):
hypothesis = models.CharField(max_length=200, unique=False)
project = models.ManyToManyField(Project)
test_conducted = models.ManyToManyField('Interview', through='HypothesesFeedback')
...
serializers.py
class ProjectSerializer(serializers.ModelSerializer):
class Meta:
model = Project
fields = ['name','description','company_name']
def __init__(self, *args, **kwargs):
super(ProjectSerializer, self).__init__(*args, **kwargs)
class HypothesisSerializer(serializers.ModelSerializer):
class Meta:
model = Hypothesis
fields = ['hypothesis','area','details', 'project']
def get_alternate_name(self, obj):
project = self.context["project_id"]
views.py
class ProjectRestCreate(LoginRequiredMixin, generics.ListCreateAPIView):
queryset = Project.objects.all()
serializer_class = ProjectSerializer
...
class HypothesisRestCreate(LoginRequiredMixin, generics.ListCreateAPIView):
queryset = Hypothesis.objects.all()
serializer_class = HypothesisSerializer
def get_serializer_context(self):
context = super().get_serializer_context()
context["project_id"] = 8 #self.kwargs['project_id']
return context
...
I'm currently unable to default the project id when creating a new object for class hypothesis. In the example above, I'm hardcoding a value just for test purposes, but what I'd need to reach is that when I create a new hypothesis starting from a given project page, the project is automatically filled, rather than the user having to manually select it.
Using Django, rather than Django REST, I'd be able to achieve that using the code below:
class HypothesisCreate(generic.CreateView):
model = Hypothesis
form_class = HypothesisForm
template_name = 'new_hypothesis.html'
def form_valid(self, form):
obj = form.save()
project = form.data['project']
p = Project.objects.filter(id=project)
obj.project.set(p)
return super(HypothesisCreate, self).form_valid(form)
def get_context_data(self, **kwargs):
context = super(HypothesisCreate, self).get_context_data(**kwargs)
context['p_id'] = self.kwargs['project']
return context
def get_success_url(self, **kwargs):
return reverse('project_detail', kwargs={'pk': self.kwargs['project']})
Any idea on how to reach the same with Django REST serializers?
EDIT #1
models.py
class Project(models.Model):
name = models.CharField(max_length=200, unique=False)
description = models.TextField()
...
class Hypothesis(models.Model):
hypothesis = models.CharField(max_length=200, unique=False)
project = models.ForeignKey(Project, on_delete= models.CASCADE)
test_conducted = models.ManyToManyField('Interview', through='HypothesesFeedback')
...
using Django rather than Django REST, I achieve the defaulting of the project when creating a new hypothesis, using get_context_data:
VIEW:
class HypothesisCreate(generic.CreateView):
model = Hypothesis
form_class = HypothesisForm
template_name = 'new_hypothesis.html'
def form_valid(self, form):
obj = form.save()
project = form.data['project']
p = Project.objects.filter(id=project)
obj.project.set(p)
return super(HypothesisCreate, self).form_valid(form)
def get_context_data(self, **kwargs):
context = super(HypothesisCreate, self).get_context_data(**kwargs)
context['p_id'] = self.kwargs['project']
return context
def get_success_url(self, **kwargs):
return reverse('project_detail', kwargs={'pk': self.kwargs['project']})
FORM:
class HypothesisForm(ModelForm):
class Meta:
model = Hypothesis
fields = ['hypothesis','area','details']
def __init__(self, *args, **kwargs):
super(HypothesisForm, self).__init__(*args, **kwargs)
self.fields["project"] = forms.CharField(widget=forms.HiddenInput())
I tried doing the same with the serializer, but without success.
VIEW:
class HypothesisRestCreate(LoginRequiredMixin, generics.ListCreateAPIView):
queryset = Hypothesis.objects.all()
serializer_class = HypothesisSerializer
def get_serializer_context(self):
context = super().get_serializer_context()
context["project_id"] = 8 #self.kwargs['project_id']
return context
SERIALIZER:
class ProjectSerializer(serializers.ModelSerializer):
class Meta:
model = Project
fields = ['name','description','company_name']
def __init__(self, *args, **kwargs):
super(ProjectSerializer, self).__init__(*args, **kwargs)
class HypothesisSerializer(serializers.ModelSerializer):
class Meta:
model = Hypothesis
fields = ['hypothesis','area','details', 'project'] #
def get_alternate_name(self, obj):
project = self.context["project_id"]
any idea what should I do differently?

Answer 1

Modify the HypothesisRestCreate as following
class HypothesisRestCreate(LoginRequiredMixin, generics.ListCreateAPIView):
queryset = Hypothesis.objects.all()
serializer_class = HypothesisSerializer
def create(self, request, *args, **kwargs):
request.data['project'] = self.kwargs['project_id']
return super(HypothesisRestCreate, self).create(request, *args, **kwargs)
# def get_serializer_context(self): -- dont need for this purpose
and HypothesisSerializer as following
class HypothesisSerializer(serializers.ModelSerializer):
class Meta:
model = Hypothesis
fields = ['hypothesis','area','details', 'project']
# def get_alternate_name(self, obj): --dont need for this purpose