Checking API Results before saving

[lone...@gmail.com]

Hello all,

    I am sending an GET request to an external API and I would like to validate the response before I save it to my model.  How do I do this?

Thank you.

[Ammar Mohammed]

Hello ,

You can design a serializer for each api endpoint and use it in your view to validate your data like validating forms data :

Pseducode :

res = requests.post(url+some_endpoint, data)

endpoint_serializer.validate(res.data)

if serializer.is_valid():

    #do your stuff

else :

    #do something 

Best Regards 

Ammar Mohammed

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[lone...@gmail.com]

Ok, I have a CreateView.  The process I have now is:

blank form is created by CreateView

After I submit the data to the form, I have a post_save that calls a function that queries the API based on the values entered in the form.

When and how do I call the serializer during this process?

[lone...@gmail.com]

I have been working on this issue.  Here is what I have so far.

My Model and pre_save information--------------------------------------------------------------------------------------------:

class walmart_query_history(models.Model):

    storeNumber = models.CharField(max_length=10)

    receiptDate = models.DateField(auto_now=False, auto_now_add=False)

    cardType = models.ForeignKey(walmart_query_history_card_type, on_delete=models.CASCADE)

    purchaseAmount = models.DecimalField(max_digits=13, decimal_places=2)

    lastFour = models.CharField(max_length=4)

    class Meta:

        unique_together = (('receiptDate', 'purchaseAmount'),)

def validate_response_ask_walmart(*args, instance, **kwargs):

    pewee = instance.receiptDate

    pewee = pewee.strftime('%m-%d-%Y')

    data = call_command('validate_response_query_walmart', instance.storeNumber, str(pewee), instance.cardType, str(instance.purchaseAmount), instance.lastFour)

    valid_ser = ValidateFormSerializer(data=data)

    if valid_ser.is_valid():

        post_data = valid_ser.validated_data

    else:

        print(valid_ser.errors)

pre_save.connect(validate_response_ask_walmart, sender=walmart_query_history)

Contents of my validate_response_ask_walmart file------------------------------------------------------------------------------------------------:

class Command(BaseCommand):

    help = 'Reads Receipts'

    def add_arguments(self, parser):

        parser.add_argument('storeId', type=str)

        parser.add_argument('purchaseDate', type=str)

        parser.add_argument('cardType', type=str)

        parser.add_argument('total', type=str)

        parser.add_argument('lastFourDigits', type=str)

    def handle(self, *args, **options):

        url = "https://www.walmart.com/chcwebapp/api/receipts"

        data = {

            "storeId": options['storeId'],

            "purchaseDate": options['purchaseDate'],

            "cardType": options['cardType'],

            "total": options['total'],

            "lastFourDigits": options['lastFourDigits']

        }

        storeId = data['storeId']

        headers = {

            'sec-ch-ua': '"Chromium";v="98", " Not A;Brand";v="99", "Google Chrome";v="98"',

            'accept': 'application/json',

            'Referer': 'https://www.walmart.com/receipt-lookup',

            'content-type': 'application/json',

            'sec-ch-ua-mobile': '?0',

            'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/98.0.4758.102 Safari/537.36',

            'sec-ch-ua-platform': '"Mac OS X"'

        }

 

        response = requests.post(url, json=data, headers=headers)

        # Good documentation about requests response codes.

        # https://www.w3schools.com/python/ref_requests_response.asp

        #print("Status Code", response.status_code)

        #print(response.text)

        #print("JSON Response ", response.json())

        base_JSON = response.json()

        #tester = base_JSON

        #return json.dumps(base_JSON, indent=4)

        self.stdout.write(type(base_JSON))

My serializer file-----------------------------------------------------------------------------------------------------------------------------------------------

from rest_framework import serializers

class ValidateFormSerializer(serializers.Serializer):

    tcNumber = serializers.CharField(max_length=255, source='receipts[0]tcNumber')

----------------------------------------------------------------------------------------

I keep getting the error code of:

AttributeError: type object 'dict' has no attribute 'endswith'

What am I missing?

[lone...@gmail.com]

[Toshar Saini]

You can design a serializer for validate  api  data firstly you will  pass data in serializer and after validate serializer  you will save to model

Pseducode :

res = requests.post(url+some_endpoint, data)

serializer = demoserializer(res.data)

if serializer.is_valid():

    model.objects.create(id =  serializer.validate_data['id'])

    #do your stuff

else :

    #do something 

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