LinkByEventType

Issue: #72 #221 #346

ruby_event_store/lib/ruby_event_store/link_by_metadata.rb

@@ -41,4 +41,22 @@ def initialize(event_store:, prefix: nil)
       )
     end
   end
+
+  class LinkByEventType
+    def initialize(
+      event_store:,
+      prefix: "$by_type_"
+    )
+      @event_store = event_store
+      @prefix = prefix
+    end
+
+    def call(event)
+      @event_store.link_to_stream(
+        [event.message_id],
+        stream_name: "#{@prefix}#{event.type}"
+      )
+    end
+  end
+
 end

ruby_event_store/spec/link_by_metadata_spec.rb

@@ -117,5 +117,31 @@ module RubyEventStore
       expect(event_store.read.stream("c-CAU").each.to_a).to eq([event])
     end
   end
+
+  RSpec.describe LinkByEventType do
+    let(:event_store) do
+      RubyEventStore::Client.new(repository: InMemoryRepository.new)
+    end
+    let(:event) { OrderCreated.new }
+
+    specify "default prefix" do
+      event_store.subscribe_to_all_events(LinkByEventType.new(event_store: event_store))
+      event_store.publish(event)
+      expect(event_store.read.stream("$by_type_OrderCreated").each.to_a).to eq([event])
+    end
+
+    specify "custom prefix" do
+      event_store.subscribe_to_all_events(LinkByEventType.new(event_store: event_store, prefix: "e-"))
+      event_store.publish(event)
+      expect(event_store.read.stream("e-OrderCreated").each.to_a).to eq([event])
+    end
+
+    specify "array of ids" do
+      event_store.subscribe_to_all_events(LinkByEventType.new(event_store: event_store))
+      expect(event_store).to receive(:link_to_stream).with(instance_of(Array), any_args)
+      event_store.publish(ev = OrderCreated.new())
+    end
+  end
+
 end