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dify - 💡(How to fix) Fix fix: migrate model type enum construction

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Fix Action

Fix / Workaround

Dify still calls ModelType.value_of(...) in provider and load-balancing services. Those call sites need to use ModelType(...) before Dify can safely upgrade to the Graphon release that contains the enum parsing change.

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Background

Graphon is moving model type alias parsing into ModelType._missing_ and removing the ModelType.value_of(...) compatibility helper in langgenius/graphon#157.

Dify still calls ModelType.value_of(...) in provider and load-balancing services. Those call sites need to use ModelType(...) before Dify can safely upgrade to the Graphon release that contains the enum parsing change.

Scope

  • Replace Graphon ModelType.value_of(...) calls with direct ModelType(...) construction.
  • Keep the change blocked until langgenius/graphon#157 is merged, released, and the Dify Graphon dependency is upgraded.

Validation

  • uv run --project api ruff format --check api/core/provider_manager.py api/services/model_load_balancing_service.py api/services/model_provider_service.py
  • uv run --project api ruff check api/core/provider_manager.py api/services/model_load_balancing_service.py api/services/model_provider_service.py

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dify - 💡(How to fix) Fix fix: migrate model type enum construction