Visualization with erdantic: UnknownModelTypeError

[fleimgruber]

As a user, I wanted to visualize the DCATDataSet that is created here with the visualization code taken from here (please ignore the erd setup code for PATH):

import os
import pathlib
import sys

if sys.platform == "win32":
    path = pathlib.Path(r"C:\Users\LeimgruberF\scoop\apps\graphviz\7.0.1\bin")
    if path.is_dir() and str(path) not in os.environ["PATH"]:
        os.environ["PATH"] += f";{path}"

import erdantic as erd

from rdflib import URIRef
from sempyro import LiteralField
from sempyro.dcat import DCATCatalog, DCATDataset


catalog_title = LiteralField(value="Example Data Catalog")
catalog_desc = LiteralField(value="This is an example data catalog that contains a single dataset.")

dataset_subject = URIRef("http://example.com/dataset/population")

catalog = DCATCatalog(title=[catalog_title], description=[catalog_desc], dataset=[dataset_subject])

dataset_title = LiteralField(value="Population statistics")
description = LiteralField(value="This is description of Test dataset")

dataset = DCATDataset(title=[dataset_title],
                    description=[description],
                    )

erd.draw(catalog, out="catalog.png")
erd.draw(dataset, out="dataset.png")

which fails with:

File "c:\Users\LeimgruberF\dev\ease-data-spaces\.venv\Lib\site-packages\erdantic\convenience.py", line 143, in draw
    diagram = create(
              ^^^^^^^
  File "c:\Users\LeimgruberF\dev\ease-data-spaces\.venv\Lib\site-packages\erdantic\convenience.py", line 67, in create
    diagram.add_model(mm)
  File "c:\Users\LeimgruberF\dev\ease-data-spaces\.venv\Lib\site-packages\erdantic\core.py", line 575, in add_model
    raise UnknownModelTypeError(model=model, available_plugins=list_plugins())
erdantic.exceptions.UnknownModelTypeError: Given model does not match any supported types. Available plugins: ['pydantic', 'pydantic_v1', 'dataclasses']. Model MRO: access_rights=None conforms_to=None contact_point=None 
creator=None description=[LiteralField(datatype=None, language=None, value='This is an example data catalog that contains a single dataset.')] has_part=None has_policy=None identifier=None is_referenced_by=None keyword=None landing_page=None license=None language=None relation=None rights=None qualified_relation=None publisher=None release_date=None theme=None title=[LiteralField(datatype=None, language=None, value='Example Data Catalog')] type=None update_date=None qualified_attribution=None has_current_version=None has_version=None previous_version=None replaces=None status=None version=None version_notes=None first=None last=None previous=None distribution=None temporal_coverage=None frequency=None in_series=None spatial=None spatial_resolution=None temporal_resolution=None was_generated_by=None catalog_record=None dataset=[Url('http://example.com/dataset/population')] service=None catalog=None homepage=None themes=None

I looked into the sources and found the inheritance graph: DCATCatalog > DCATDataset > DCATResource > RDFModel > BaseModel. So I expected it to be a pydantic model.

Env info:
Python 3.11.8
SeMPyRO 1.5.0

[fleimgruber]

@agjharms FYI and as I saw you answering on the other issues: I tried to make the example more self-contained and reproducible so to be more actionable. Please let me know how to support in debugging or if there are wrong assumptions on my side. Thanks!

edit: Just upgraded from v1.5.0 to v2.0.1, still the same error. erdantic is v1.0.5.

[agjharms]

Hi fleimgruber,

My apologies for the delayed response. I have looked into your issue with erdantic. The implemented functionality only supports drawing diagrams of the class definitions themselves, but unfortunately not of specific instances. This would mean that the following code snippet would work:

from sempyro.dcat import DCATCatalog, DCATDataset
erd.draw(DCATCatalog, out="catalog.png")
erd.draw(DCATDataset, out="dataset.png")

Currently we do not have plans to implement the functionality of drawing instances with erdantic, but we welcome any PRs.