ngsi_v2 tutorials are deprecated

[WaltherTrgovac]

Describe the bug
ngsi_v2 tutorials consist of exercises and solutions. Solutions use methods that are deprecated (pydantic and json methods).

To Reproduce
Executing exercise 3 solutions to exercise 7 produces various errors.

Expected behavior
Solutions should run properly.

Screenshots

Environment (please complete the following information):

Additional context
Mostly TypeErrors are causing the errors that are easy to fix. There are also some PEP 8 errors occuring.

[github-actions]

Branch 255-ngsi_v2-tutorials-are-deprecated created!

[WaltherTrgovac]

I am running into problems at exercise 5. There is a method imported from pydantic called parse_file_as. This method does not exist in version 2 of pydantic anymore. What I tried to do is use the method validate_python. This method takes a loaded json file as a parameter. I have done that, but then I keep running into other errors that might be connected to the deprecated method.
Here is the attempt.

[WaltherTrgovac]

I am running into problems at exercise 5. There is a method imported from pydantic called parse_file_as. This method does not exist in version 2 of pydantic anymore. What I tried to do is use the method validate_python. This method takes a loaded json file as a parameter. I have done that, but then I keep running into other errors that might be connected to the deprecated method. Here is the attempt.

I have made some progress here. It might be, that this is the correct implementation but now other problems appear. It seems that SERVICE_PATH is playing a role. After you change the service path in exercise 4 to something unique and you try to execute exercise 5, you have to have the same service path which makes sense. The following error appears: requests.exceptions.HTTPError: 500 Server Error: Internal Server Error for url: http://localhost:4041/iot/devices.
Interestingly, if you try to execute the same file (exercise 5) again, you get the following error: pydantic_core._pydantic_core.ValidationError: 1 validation error for list[ServiceGroup] 0.cbHost Input should be a valid URL, relative URL without a base [type=url_parsing, input_value='None', input_type=str]. And if you try to execute the file again, the second error keeps appearing. So the first error appears only after single execution and not again. If you want it to appear again, you would need to execute exercise 4 with changed service path.

[djs0109]

@WaltherTrgovac thanks for the contribution! Could you make a pull request (PR) for this branch? We can better discuss the detail implementation or solution under the PR

[hannahgoerigk]

Hey, I am currently trying to follow these tutorials and stumbled upon the same issues you've already mentioned here. I am currently stuck on e5, as I get the same parsing error you have.
I got some additional issues I'd like to add here as there are inconstistencies between the tasks and solutions (minor fixes):

e4_iot_thermal_zone_sensors.py:

• Missing Import in line 34: from filip.clients.ngsi_v2 import ContextBrokerClient, IoTAClient
• Missing Code at the end of the exercise: starts at 264 in e4_iot_thermal_zone_sensors_solution.py

e5_iot_thermal_zone_control.py:

• Missing Import in line 47: from filip.models.base import DataType, FiwareHeader

I haven't continued with the other exercises yet. If I find more inconsistencies, I will post them here

[tstorek]

@WaltherTrgovac validate_python is most likely not the function you used. In the newer evrsion of pydantic you need to parse the json yourself and then, e.g. use the validate_model function. If the *.json contains a list you need to convert to a list of dicts.

Subseeunetly, you can create a list of models usige e.g. list-comprehension