from rest_framework import serializers
from .models import EvaluationTest, Question, Choice, GradeEvaluationText,
Category
from users.models import User


class StringSerializer(serializers.StringRelatedField):
def to_internal_value(self, value):
return value


class ChoiceSerializer(serializers.ModelSerializer):
class Meta:
model = Choice
fields = '__all__'


class QuestionSerializer(serializers.ModelSerializer):
choices = ChoiceSerializer(many=True)
answer_text = serializers.CharField(
max_length=50, required=True, write_only=True)

class Meta:
model = Question
fields = ('id', 'choices', 'question',
'order', 'answer_text', 'answer')
read_only_fields = ('answer', )

def validate(self, attrs):
attrs = super().validate(attrs)
if not any(map(lambda x: x['title'] == attrs["answer_text"], attrs["choices"
])):
raise serializers.ValidationError("Answer must match the choices")

self.answer_text = attrs["answer_text"]
del attrs["answer_text"]
return attrs

def create(self, validated_data):
choices = validated_data.pop("choices")
question = super().create(validated_data)
for choice_data in choices:
choice = Choice.objects.create(title=choice_data["title"])
question.choices.add(choice)
if choice_data["title"] == self.answer_text:
question.answer = choice
question.save()
return question

def update(self, instance, validated_data):
choices = validated_data.pop["choices"]
instance = super().update(instance, validated_data)
choices = ChoiceSerializer(data=choices, many=True)
choices.is_valid(raise_exception=True)
choices = choices.save()

old_ids = list(instance.choices.values_list("id", flat=True))
for choice in choices:
instance.choices.add(choice)
if self.answer_text == choice.title:
instance.answer = choice
Choice.objects.filter(id__in=old_ids).delete()

return instance


class CategorySerializer(serializers.ModelSerializer):
class Meta:
model = Category
fields = '__all__'


class EvaluationTestSerializer(serializers.ModelSerializer):
questions = serializers.SerializerMethodField()

class Meta:
model = EvaluationTest
fields = '__all__'

def get_questions(self, obj):
return QuestionSerializer(obj.questions.all(), many=True).data

# def by_category(category_id):
# tests = EvaluationTest.objects.filter(category_id=category_id)
# items = EvaluationTestSerializer(tests, many=True).data
# return items

def validate(self, data, *args, **kwargs):
questions = self.context["request"].data.get("questions",None)
if not questions:
raise serializers.ValidationError("questions are required")
if self.context["request"].method == "POST":
self.questions = QuestionSerializer(data=questions, many=True)
self.questions.is_valid(raise_exception=True)
elif self.context["request"].method == "PUT":
self.questions = questions
self.new_questions = self.context["request"].data.get(
"new_questions")
if self.new_questions:
self.new_questions = QuestionSerializer(
data=self.new_questions, many=True)
self.new_questions.is_valid(raise_exception=True)
return data

def create(self, data):
evaluation_test = EvaluationTest()
evaluation_test.category = data["category"]
evaluation_test.admin = data["admin"]
evaluation_test.title = data["title"]
evaluation_test.type = data["type"]
evaluation_test.save()

for question in data["questions"]:
question.evaluationtest = evaluation_test
question.save()

return evaluation_test

def update(self, instance, validated_data):
instance.title = validated_data.get("title", instance.title)
instance.type = validated_data.get("type", instance.type)
instance.category = validated_data.get("category", instance.category)
instance.admin = validated_data.get("admin", instance.admin)

for question in self.questions:
q = QuestionSerializer(instance=question["id"], data=question)
q.is_valid(raise_exception=True)
q.save()

if self.new_questions:
new_questions = self.new_questions.save()
for question in new_questions:
question.save()
return instance


On Mon, Apr 8, 2019 at 3:08 PM Arbaz Hundekar <
arbaz.hunde...@avetoconsulting.com> wrote:

> try this
> questions = self.context['request'].data.get("questions",None)
>
> If questions is not in request.data it will be set to None. It will work
> with your not condition as well.
>
> On Mon, Apr 8, 2019 at 6:35 PM zohaib younis <zabi.jarra...@gmail.com>
> wrote:
>
>> arbaz thanks for your guidance i have resolved that issue now when i try
>> to create a test it is giving me an error
>> for question in data["questions"]:
>> keyError :'questions'
>> can you help me with that problem thanks
>>
>> On Mon, Apr 8, 2019 at 3:00 PM Arbaz Hundekar <
>> arbaz.hunde...@avetoconsulting.com> wrote:
>>
>>> while instantiating your serializer do like this ser =
>>> Serializer(context={"request": request})
>>>
>>> On Mon, Apr 8, 2019 at 1:57 PM zohaib younis <zabi.jarra...@gmail.com>
>>> wrote:
>>>
>>>> def validate(self, data, *args, **kwargs):
>>>> questions = self.context['request'].data.get("questions")
>>>> if not questions:
>>>> raise serializers.ValidationError("questions are required")
>>>> if self.context["request"].method == "POST":
>>>> self.questions = QuestionSerializer(data=questions, many=True)
>>>> self.questions.is_valid(raise_exception=True)
>>>> elif self.context["request"].method == "PUT":
>>>> self.questions = questions
>>>> self.new_questions = self.context["request"].data.get(
>>>> "new_questions")
>>>> if self.new_questions:
>>>> self.new_questions = QuestionSerializer(
>>>> data=self.new_questions, many=True)
>>>> self.new_questions.is_valid(raise_exception=True)
>>>> return data
>>>>
>>>> def create(self, data):
>>>> evaluation_test = EvaluationTest()
>>>> evaluation_test.category = data['category']
>>>> evaluation_test.admin = data['admin']
>>>> evaluation_test.title = data['title']
>>>> evaluation_test.type = data['type']
>>>> evaluation_test.save()
>>>>
>>>> for question in data['questions']:
>>>> question.evaluationtest = evaluation_test
>>>> question.save()
>>>> return evaluation_test
>>>>
>>>> def update(self, instance, validated_data):
>>>> instance.title = validated_data.get["title", instance.title]
>>>> instance.type = validated_data.get["type", instance.type]
>>>> instance.category = validated_data.get["category", instance.category]
>>>> instance.admin = validated_data.get["admin", instance.admin]
>>>>
>>>> for question in self.questions:
>>>> q = QuestionSerializer(instance=question["id"], data=question)
>>>> q.is_valid(raise_exception=True)
>>>> q.save()
>>>>
>>>> if self.new_questions:
>>>> new_questions = self.new_questions.save()
>>>> for question in new_questions:
>>>> question.save()
>>>> return instance
>>>>
>>>> --
>>>> You received this message because you are subscribed to the Google
>>>> Groups "Django REST framework" group.
>>>> To unsubscribe from this group and stop receiving emails from it, send
>>>> an email to django-rest-framework+unsubscr...@googlegroups.com.
>>>> For more options, visit https://groups.google.com/d/optout.
>>>>
>>>
>>>
>>> --
>>> Warm Regards,
>>>
>>> Arbaz
>>>
>>> --
>>> You received this message because you are subscribed to the Google
>>> Groups "Django REST framework" group.
>>> To unsubscribe from this group and stop receiving emails from it, send
>>> an email to django-rest-framework+unsubscr...@googlegroups.com.
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>>>
>> --
>> You received this message because you are subscribed to the Google Groups
>> "Django REST framework" group.
>> To unsubscribe from this group and stop receiving emails from it, send an
>> email to django-rest-framework+unsubscr...@googlegroups.com.
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>>
>
>
> --
> Warm Regards,
>
> Arbaz
>
> --
> You received this message because you are subscribed to the Google Groups
> "Django REST framework" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to django-rest-framework+unsubscr...@googlegroups.com.
> For more options, visit https://groups.google.com/d/optout.
>

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