OpenAPI does not resolve local files

[indietyp]

Describe the bug

I have been trying to use datamodel-code-generator with the following specification: https://github.com/hashintel/hash/blob/main/apps/hash-graph/openapi/openapi.json.

The current workflow is that I first bundle all references using @redocly/cli and then pipe it into datamodel-code-generator, but from my understanding, datamodel-code-generator actually supports loading local files.

Sadly it seems like something in our configuration is going wrong, as datamodel-code-generator terminates unsuccessfully, claiming it cannot resolve a reference (which one is unclear). Shown from the bundle commands before, our schema is certainly well-formed, so I do not fully understand what the problem is.

Any help would be greatly appreciated. Thank you! This app has already been a huge help!

To Reproduce

https://github.com/hashintel/hash/blob/bm/graph/name-fix/apps/hash-graph/openapi/openapi.json

(I'd love to show a minimal reproducible example here, but I haven't been able to minimize the input yet)

Used commandline:

poetry run datamodel-codegen \
  --input "openapi.json" \
  --output "$DIR/../graph_client/models.py" \
  --output-model-type pydantic_v2.BaseModel \
  --input-file-type openapi \
  --use-standard-collections \
  --use-union-operator \
  --target-python-version 3.11 \
  --use-schema-description \
  --snake-case-field \
  --disable-timestamp \
  --enable-version-header \
  --enum-field-as-literal one \
  --use-double-quotes \
  --field-constraints \
  --allow-population-by-field-name \
  --strict-nullable \
  --use-title-as-name

Expected behavior

datamodel-code-generator is able to generate a schema.

Version:

• OS: [e.g. iOS] macOS
• Python version: 3.11
• datamodel-code-generator version: 0.21.3

Additional context

The error I am encountering is:

Exception: A Parser can not resolve classes: [class: openapi.json#/components/schemas/CreatePropertyTypeRequest references: frozenset({'models/property_type.json#', 'openapi.json#/components/schemas/OwnedById', 'openapi.json#/components/schemas/RecordCreatedById'})], [class: models/property_type.json# references: frozenset({'models/shared.json#/definitions/VersionedUrl', 'models/property_type.json#/definitions/PropertyValues'})], [class: openapi.json#/components/schemas/DataTypeStructuralQuery references: frozenset({'openapi.json#/components/schemas/GraphResolveDepths', 'openapi.json#/components/schemas/Filter', 'openapi.json#/components/schemas/QueryTemporalAxesUnresolved'})], [class: openapi.json#/components/schemas/EntityStructuralQuery references: frozenset({'openapi.json#/components/schemas/GraphResolveDepths', 'openapi.json#/components/schemas/Filter', 'openapi.json#/components/schemas/QueryTemporalAxesUnresolved'})], [class: openapi.json#/components/schemas/EntityTypeStructuralQuery references: frozenset({'openapi.json#/components/schemas/GraphResolveDepths', 'openapi.json#/components/schemas/Filter', 'openapi.json#/components/schemas/QueryTemporalAxesUnresolved'})], [class: openapi.json#/components/schemas/Filter/Filter#-datamodel-code-generator-#-oneOf-#-special-#/0#-datamodel-code-generator-#-object-#-special-# references: frozenset({'openapi.json#/components/schemas/Filter'})], [class: openapi.json#/components/schemas/Filter/Filter#-datamodel-code-generator-#-oneOf-#-special-#/1#-datamodel-code-generator-#-object-#-special-# references: frozenset({'openapi.json#/components/schemas/Filter'})], [class: openapi.json#/components/schemas/Filter/Filter#-datamodel-code-generator-#-oneOf-#-special-#/2#-datamodel-code-generator-#-object-#-special-# references: frozenset({'openapi.json#/components/schemas/Filter'})], [class: openapi.json#/components/schemas/Filter references: frozenset({'openapi.json#/components/schemas/Filter/Filter#-datamodel-code-generator-#-oneOf-#-special-#/7#-datamodel-code-generator-#-object-#-special-#', 'openapi.json#/components/schemas/Filter/Filter#-datamodel-code-generator-#-oneOf-#-special-#/5#-datamodel-code-generator-#-object-#-special-#', 'openapi.json#/components/schemas/Filter/Filter#-datamodel-code-generator-#-oneOf-#-special-#/0#-datamodel-code-generator-#-object-#-special-#', 'openapi.json#/components/schemas/Filter/Filter#-datamodel-code-generator-#-oneOf-#-special-#/6#-datamodel-code-generator-#-object-#-special-#', 'openapi.json#/components/schemas/Filter/Filter#-datamodel-code-generator-#-oneOf-#-special-#/4#-datamodel-code-generator-#-object-#-special-#', 'openapi.json#/components/schemas/Filter/Filter#-datamodel-code-generator-#-oneOf-#-special-#/1#-datamodel-code-generator-#-object-#-special-#', 'openapi.json#/components/schemas/Filter/Filter#-datamodel-code-generator-#-oneOf-#-special-#/2#-datamodel-code-generator-#-object-#-special-#', 'openapi.json#/components/schemas/Filter/Filter#-datamodel-code-generator-#-oneOf-#-special-#/3#-datamodel-code-generator-#-object-#-special-#'})], [class: openapi.json#/components/schemas/OntologyVertex/OntologyVertex#-datamodel-code-generator-#-oneOf-#-special-#/1#-datamodel-code-generator-#-object-#-special-# references: frozenset({'openapi.json#/components/schemas/PropertyTypeWithMetadata'})], [class: openapi.json#/components/schemas/OntologyVertex references: frozenset({'openapi.json#/components/schemas/OntologyVertex/OntologyVertex#-datamodel-code-generator-#-oneOf-#-special-#/1#-datamodel-code-generator-#-object-#-special-#', 'openapi.json#/components/schemas/OntologyVertex/OntologyVertex#-datamodel-code-generator-#-oneOf-#-special-#/2#-datamodel-code-generator-#-object-#-special-#', 'openapi.json#/components/schemas/OntologyVertex/OntologyVertex#-datamodel-code-generator-#-oneOf-#-special-#/0#-datamodel-code-generator-#-object-#-special-#'})], [class: openapi.json#/components/schemas/OntologyVertices references: frozenset({'openapi.json#/components/schemas/OntologyVertex'})], [class: openapi.json#/components/schemas/PropertyTypeStructuralQuery references: frozenset({'openapi.json#/components/schemas/GraphResolveDepths', 'openapi.json#/components/schemas/Filter', 'openapi.json#/components/schemas/QueryTemporalAxesUnresolved'})], [class: openapi.json#/components/schemas/PropertyTypeWithMetadata references: frozenset({'openapi.json#/components/schemas/OntologyElementMetadata', 'models/property_type.json#'})], [class: openapi.json#/components/schemas/Subgraph references: frozenset({'openapi.json#/components/schemas/GraphResolveDepths', 'openapi.json#/components/schemas/GraphElementVertexId', 'openapi.json#/components/schemas/SubgraphTemporalAxes', 'openapi.json#/components/schemas/Vertices', 'openapi.json#/components/schemas/Edges'})], [class: openapi.json#/components/schemas/UpdatePropertyTypeRequest references: frozenset({'models/update_property_type.json#', 'openapi.json#/components/schemas/RecordCreatedById'})], [class: models/update_property_type.json# references: frozenset({'models/update_property_type.json#/definitions/PropertyValuesUpdate'})], [class: openapi.json#/components/schemas/Vertex references: frozenset({'openapi.json#/components/schemas/KnowledgeGraphVertex', 'openapi.json#/components/schemas/OntologyVertex'})], [class: openapi.json#/components/schemas/Vertices references: frozenset({'openapi.json#/components/schemas/KnowledgeGraphVertex', 'openapi.json#/components/schemas/OntologyVertex'})].