Fix workflow list MongoDB fallback

[JoshVanL]

The CLI's direct MongoDB fallback (used when gRPC ListInstanceIDs is unavailable) searched for a "key" field, but the Dapr MongoDB state store stores document keys in the "_id" field. This caused dapr workflow list -c 'mongodb://...' to always return empty results.

[Copilot]

Pull request overview

Fixes the CLI’s MongoDB direct-query fallback used for dapr workflow list by querying workflow metadata keys from MongoDB’s _id field (as stored by the Dapr MongoDB state store), instead of a non-existent key field.

Changes:

• Update MongoDB filter to query on _id and decode keys from _id.
• Adjust MongoDB projection to return _id.
• Add unit tests validating _id-based behavior and the generated query filter.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
pkg/workflow/db/mongo.go	Switches MongoDB list query from key to _id and updates projection/decoding accordingly.
pkg/workflow/db/mongo_test.go	Adds mocked MongoDB tests for listing and filter construction.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

You can also share your feedback on Copilot code review. Take the survey.

[Copilot]

Pull request overview

Fixes the CLI’s MongoDB direct-access fallback for workflow listing by querying the correct MongoDB document key field (_id) used by the Dapr MongoDB state store, preventing empty results when gRPC ListInstanceIDs is unavailable.

Changes:

• Update MongoDB list query to filter/project on _id rather than key.
• Decode _id values into the returned key list.
• Add unit tests validating _id usage, regex filter construction, and empty-result behavior.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
pkg/workflow/db/mongo.go	Switches Mongo query filter/projection and decode tag from key to _id.
pkg/workflow/db/mongo_test.go	Adds mock-based tests ensuring _id is used and regex is formed correctly.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

You can also share your feedback on Copilot code review. Take the survey.

[cicoyle]

lgtm, but plz address copilots feedback

[JoshVanL]

@cicoyle addressed comments!