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pydantic_error_message

Hi, I'm trying to return an instance of <https://gist.github.com/markns/57fa82c32af212b25e6bc0c4df5c9387|this SourceRead> class from a task, but I'm running into some Pydantic weirdness.

The salient bit is
```    return self.additional_properties[key]
KeyError: 0```
I'm not very familiar with Pydantic - is there an obvious solution?

Try check what the keys are using the property method `additional_keys`

The error is raised when the `Completed` function in states.py is called:
```def Completed(cls: Type[State] = State, **kwargs) -&gt; State:
    """Convenience function for creating `Completed` states.

    Returns:
        State: a Completed state
    """
    return cls(type=StateType.COMPLETED, **kwargs)```
where `kwargs` is
```kwargs = {dict: 1}
  additional_keys = {list: 0} []
  additional_properties = {dict: 0} {}
  connection_configuration = {dict: 1} {'credentials'...
  name = {str} 'Airtable'
  source_definition_id = {str} '14c6e7ea-...'
  source_id = {str} '6109..'
  source_name = {str} 'Airtable'
  workspace_id = {str} '52e...'```
... and then we're into some Pydantic magic...
```  File "pydantic/main.py", line 339, in pydantic.main.BaseModel.__init__
  File "pydantic/main.py", line 1076, in pydantic.main.validate_model
  File "pydantic/fields.py", line 884, in pydantic.fields.ModelField.validate
  File "pydantic/fields.py", line 1094, in pydantic.fields.ModelField._validate_singleton
  File "pydantic/fields.py", line 892, in pydantic.fields.ModelField.validate
  File "pydantic/fields.py", line 1151, in pydantic.fields.ModelField._apply_validators
  File "pydantic/class_validators.py", line 337, in pydantic.class_validators._generic_validator_basic.lambda13
  File "pydantic/main.py", line 716, in pydantic.main.BaseModel.validate```
before the `__getitem__` method is called.
```  File "/Users/markns/workspace/apollo/alakazam/airbyte_client/models/source_read.py", line 94, in __getitem__
    return self.additional_properties[key]
KeyError: 0```
No idea whats happening in the pydantic code to call the getitem, but I'll start digging through :mag:

Hmm, this is nothing to do with Prefect or Pydantic in fact... just that the SourceRead model generated from `openapi-python-client` doesn't support being turned into a dict
```In [6]: s = SourceRead("few", "fdsf", "fdsf", {'user': 'charles'}, "fdsfsd", "fdsfds")
s
Out[6]: SourceRead(source_definition_id='few', source_id='fdsf', workspace_id='fdsf', connection_configuration={'user': 'charles'}, name='fdsfsd', source_name='fdsfds', icon=&lt;airbyte_client.types.Unset object at 0x102eaa890&gt;, additional_properties={})

In [7]: dict(s)
Traceback (most recent call last):
  File "/Users/markns/Library/Caches/pypoetry/virtualenvs/alakazam-vR_Oc5bv-py3.10/lib/python3.10/site-packages/IPython/core/interactiveshell.py", line 3460, in run_code
    exec(code_obj, self.user_global_ns, self.user_ns)
  File "&lt;ipython-input-7-592f42a061b0&gt;", line 1, in &lt;module&gt;
    dict(s)
  File "/Users/markns/workspace/apollo/alakazam/airbyte_client/models/source_read.py", line 94, in __getitem__
    return self.additional_properties[key]
KeyError: 0```