fix: fix provider_id is empty

[fatelei]

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Summary

fix #30372

fix provider_id is empty

Screenshots

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Checklist

• This change requires a documentation update, included: Dify Document
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods

[gemini-code-assist]

Summary of Changes

Hello @fatelei, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses a critical bug where the provider_id for workflow tools was not being properly set, leading to empty IDs. The fix involves updating the WorkflowToolProviderController to correctly retrieve and assign the provider_id from the database object, resolving issue #30372 and ensuring that workflow tool providers are accurately identified.

Highlights

• Bug Fix: Empty Provider ID: Resolved an issue where the provider_id for workflow tools was incorrectly initialized as an empty string instead of being populated from the database object.
• Data Accuracy: Ensured that the provider_id is now correctly assigned using db_provider.id, improving the accuracy and integrity of workflow tool provider data.

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[gemini-code-assist]

Code Review

This pull request addresses a bug where the provider_id for a WorkflowToolProviderController was being initialized as an empty string. The change correctly assigns the db_provider.id to this field, ensuring the controller is instantiated with the proper provider identifier. This is a direct and effective fix for the issue. Additionally, a minor formatting change removes an unnecessary blank line.

[cmlibo]

刚刚还在看这个问题，终于修复了。未修复前现状：不同环境发布的Workflow工具，ID改成一致后，工具无法识别。添加新工具后，也无法执行，provider_id 为空。