Let EventSummary do the work to summarize events

app/helpers/event_summaries_helper.rb

@@ -1,20 +0,0 @@
-module EventSummariesHelper
-  def event_description_for(event)
-    case event.action
-    when "created"
-      "Added by #{event.creator.name} #{time_ago_in_words(event.created_at)} ago."
-    when "assigned"
-      "Assigned to #{event.assignees.pluck(:name).to_sentence} #{time_ago_in_words(event.created_at)} ago."
-    when "staged"
-      "#{event.creator.name} moved this to '#{event.stage_name}'."
-    when "unstaged"
-      "#{event.creator.name} removed this from '#{event.stage_name}'."
-    end
-  end
-
-  def tallied_boosts_for(event_summary)
-    if (tally = event_summary.events.tallied_boosts.presence)
-      tally.map { |creator, count| "#{creator.name} +#{count}" }.to_sentence + "."
-    end
-  end
-end

app/models/event_summary.rb

@@ -1,9 +1,39 @@
 class EventSummary < ApplicationRecord
   include Messageable
 
-  has_many :events, -> { chronologically }, dependent: :delete_all, inverse_of: :summary do
-    def tallied_boosts
-      boosts.group(:creator).count
-    end
+  has_many :events, -> { chronologically }, dependent: :delete_all, inverse_of: :summary
+
+  def body
+    "#{main_summary} #{boosts_summary}"
   end
+
+  private
+    delegate :time_ago_in_words, to: "ApplicationController.helpers"
+
+    def main_summary
+      events.non_boosts.map { |event| summarize(event) }.join(" ")
+    end
+
+    def summarize(event)
+      case event.action
+      when "created"
+        "Added by #{event.creator.name} #{time_ago_in_words(event.created_at)} ago."
+      when "assigned"
+        "Assigned to #{event.assignees.pluck(:name).to_sentence} #{time_ago_in_words(event.created_at)} ago."
+      when "staged"
+        "#{event.creator.name} moved this to '#{event.stage_name}'."
+      when "unstaged"
+        "#{event.creator.name} removed this from '#{event.stage_name}'."
+      end
+    end
+
+    def boosts_summary
+      tallied_boosts.map do |creator, count|
+        "#{creator.name} +#{count}"
+      end.to_sentence + "."
+    end
+
+    def tallied_boosts
+      events.boosts.group(:creator).count
+    end
 end

app/views/event_summaries/_event_summary.html.erb

@@ -1,7 +1,3 @@
 <div class="event-summary flex-inline flex-wrap align-start fill-white border-radius center position-relative" data-controller="event-summary">
-  <% event_summary.events.non_boosts.each do |event| %>
-    <%= event_description_for event %>
-  <% end %>
-
-  <%= tallied_boosts_for event_summary %>
+  <%= event_summary.body %>
 </div>