Add DCB event type filtering and auto-discovery of tag types#4170
Merged
jeremydmiller merged 2 commits intomasterfrom Mar 12, 2026
Merged
Add DCB event type filtering and auto-discovery of tag types#4170jeremydmiller merged 2 commits intomasterfrom
jeremydmiller merged 2 commits intomasterfrom
Conversation
…types - FetchForWritingByTags now automatically applies event type filtering from the aggregator's projection when it extends EventFilterable, so users don't have to redundantly specify event types in both the projection and the EventTagQuery. - Tag types are now auto-discovered from registered SingleStreamProjection and MultiStreamProjection types that use strong-typed identifiers as their TId. Users no longer need to explicitly call RegisterTagType().ForAggregate() unless they want to customize the table suffix. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This was referenced Mar 16, 2026
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
1 participant
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Summary
Event type filtering in FetchForWritingByTags: When the aggregator's projection extends
EventFilterableand hasIncludedEventTypes, those types are automatically applied as a SQL filter (AND e.type = ANY(...)) on tag queries. This eliminates the need to redundantly specify event types in both the projection and theEventTagQuery.Auto-discovery of tag types from projections: During
EventGraph.Initialize(), registeredSingleStreamProjectionandMultiStreamProjectiontypes with strong-typed identifiers (non-primitiveTId) are automatically registered as tag types withForAggregate(). Users no longer need to explicitly callRegisterTagType<T>().ForAggregate<TAgg>()unless they want to customize the table suffix.Unit tests: 5 new tests covering auto-discovery behavior (auto-registration, explicit precedence, primitive type exclusion, querying, and fetch-for-writing integration).
Documentation: Updated
docs/events/dcb.mdwith a new "Automatic Tag Type Registration" section explaining how projections with strong-typed identifiers auto-register tag types.Test plan
🤖 Generated with Claude Code