< Marvin> I am getting this error ``` id 0686d5dc 4d24 74e0 Prefect Community #ask-marvin

<@ULVA73B9P> I am getting this error ```{ "id":...

Michael Schwartz

07/08/2025, 6:07 PM

@Marvin I am getting this error

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{
  "id": "0686d5dc-4d24-74e0-8000-a25c7f861709",
  "account": "1f68ce6c-568d-4d7a-ae99-9641099300bd",
  "event": "prefect-cloud.webhook.failed",
  "occurred": "2025-07-08T18:04:52.821Z",
  "payload": {
    "method": "POST",
    "headers": {
      "host": "api.prefect.cloud",
      "user-agent": "python-requests/2.32.3",
      "accept-encoding": "gzip, deflate",
      "accept": "*/*",
      "content-type": "application/json",
      "content-length": "1408",
      "x-request-id": "1a66776c-5201-9755-85ef-bc683eeb2df6"
    },
    "body": "{\"data\": [{\"uom\": \"gram\", \"brand\": \"PINNACLE VALLEY FARMS\", \"state\": \"Vermont\", \"source\": \"dutchie\", \"strain\": \"N/A\", \"thc_mg\": \"100\", \"menu_id\": \"16a2482a571ffea0cdb34e7d4545c8db\", \"segment\": \"Soft Candy\", \"category\": \"Edibles\", \"brand_src\": \"Pinnacle Valley Farms\", \"image_url\": \"<https://askhoodie.com/cdn-cgi/image/quality=50/https://data-item-images.s3.us-east-2.amazonaws.com/success/2de24aa74f2be5fbcd1f1db9bfd5ace0>\", \"item_name\": \"Blue Raspberry 100mg Hash Rosin Gummies\", \"__record_id\": \"932cbe36c70ee680d093c969dcdc755c__unifyd_master_3986919\", \"subsegment\": \"Gummies\", \"description\": \"Delightful Hash Rosin Gummies from our friends at Pinnacle Valley Farms. Blue Raspberry is their \\\"Calming\\\" blend.\\n\\n5mg THC per gummy, 20 gummies per pack (100mg)\\n\\nVEGAN!\\n\\nIngredients: Sugar, Tapioca syrup, Water (Distilled), Pectin, Natural flavor, Citric acid, Sodium citrate, MCT, Hash rosin, Natural & artificial colors\", \"dict_flavor\": \"Blue Raspberry\", \"variant_url\": \"<https://dutchie.com/dispensary/cann-maxx/product/pinnacle-valley-farms-blue-raspberry>\", \"category_src\": \"EDIBLES\", \"parent_brand\": \"PINNACLE VALLEY FARMS\", \"sub_category\": \"gummies\", \"cannabis_type\": \"INDICA\", \"dict_pack_size\": \"20 pack\", \"pos_product_id\": \"153139\", \"product_id_src\": \"af1b4a49f6075dfec8d4669652c307fb\", \"product_presentation\": \"100.00 mg\", \"dict_concentrate_type\": \"Rosin\", \"category_src_normalized\": \"Edibles\"}]}",
    "rendered": {
      "event": "pim.unifyd.catsy",
      "resource": {
        "prefect.resource.id": "pim.unifyd.catsy.handle",
        "payload": [
          {
            "__record_id": "932cbe36c70ee680d093c969dcdc755c__unifyd_master_3986919",
            "brand": "PINNACLE VALLEY FARMS",
            "brand_src": "Pinnacle Valley Farms",
            "cannabis_type": "INDICA",
            "category": "Edibles",
            "category_src": "EDIBLES",
            "category_src_normalized": "Edibles",
            "description": "Delightful Hash Rosin Gummies from our friends at Pinnacle Valley Farms. Blue Raspberry is their \"Calming\" blend.\n\n5mg THC per gummy, 20 gummies per pack (100mg)\n\nVEGAN!\n\nIngredients: Sugar, Tapioca syrup, Water (Distilled), Pectin, Natural flavor, Citric acid, Sodium citrate, MCT, Hash rosin, Natural & artificial colors",
            "dict_concentrate_type": "Rosin",
            "dict_flavor": "Blue Raspberry",
            "dict_pack_size": "20 pack",
            "image_url": "<https://askhoodie.com/cdn-cgi/image/quality=50/https://data-item-images.s3.us-east-2.amazonaws.com/success/2de24aa74f2be5fbcd1f1db9bfd5ace0>",
            "item_name": "Blue Raspberry 100mg Hash Rosin Gummies",
            "menu_id": "16a2482a571ffea0cdb34e7d4545c8db",
            "parent_brand": "PINNACLE VALLEY FARMS",
            "pos_product_id": "153139",
            "product_id_src": "af1b4a49f6075dfec8d4669652c307fb",
            "product_presentation": "100.00 mg",
            "segment": "Soft Candy",
            "source": "dutchie",
            "state": "Vermont",
            "strain": "N/A",
            "sub_category": "gummies",
            "subsegment": "Gummies",
            "thc_mg": "100",
            "uom": "gram",
            "variant_url": "<https://dutchie.com/dispensary/cann-maxx/product/pinnacle-valley-farms-blue-raspberry>"
          }
        ]
      }
    },
    "compiled": null,
    "reason": "1 validation error for Event\nresource.payload\n  Input should be a valid string [type=string_type, input_value=[{'__record_id': '932cbe3...-farms-blue-raspberry'}], input_type=list]\n    For further information visit <https://errors.pydantic.dev/2.10/v/string_type>"
  },
  "received": "2025-07-08T18:04:52.821Z",
  "related": [],
  "resource": {
    "prefect.resource.id": "prefect-cloud.webhook.283c8f61-321f-4336-99a8-b679b2206dbf",
    "prefect.resource.name": "Upsert Catsy Products"
  },
  "workspace": "8f854e6c-4fe7-49b7-860c-8f2e7973c905"

what can i modify in my webhook or in the flow this triggers to avoid this pydantic error? this is my template

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{
  "event": "pim.unifyd.catsy",
  "resource": {
    "prefect.resource.id": "pim.unifyd.catsy.handle",
    "payload": {{ body.data | tojson }}
  }
}

Marvin

07/08/2025, 6:07 PM

✅ thought for 8.0 seconds

Marvin

07/08/2025, 6:07 PM

Ah, a classic case of Pydantic being particular about its data types. The error is telling us that the webhook is expecting a string for

resource.payload

, but it's receiving a list. Let's fix this. You have two options: 1. Modify the webhook template to stringify the entire payload:

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json
{
  "event": "pim.unifyd.catsy",
  "resource": {
    "prefect.resource.id": "pim.unifyd.catsy.handle",
    "payload": {{ body.data | tojson | tojson }}
  }
}

Notice the double

tojson

filter - this will ensure the list is converted to a JSON string. 2. Modify your flow to expect and parse a JSON string. If you're using Pydantic models, your model should look something like:

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python
from pydantic import BaseModel

class WebhookPayload(BaseModel):
    event: str
    resource: dict[str, str]  # or create a nested model for resource

Then in your flow, you can parse the string back into a list:

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python
import json

@flow
def handle_webhook(webhook_data: WebhookPayload):
    payload = json.loads(webhook_data.resource["payload"])
    # Now payload is your original list of dictionaries
    ...

I recommend the first approach (modifying the webhook template) as it's simpler and maintains better compatibility with Prefect's webhook validation. Let me know if you need help implementing either solution!

Nate

07/08/2025, 6:08 PM

🤨 skeptical about the double