Use local vars so ivar dependency is only from before actions

app/controllers/cards/comments/reactions_controller.rb

@@ -11,17 +11,17 @@ class Cards::Comments::ReactionsController < ApplicationController
   end
 
   def create
-    @reaction = @comment.reactions.create!(reaction_params)
+    reaction = @comment.reactions.create!(reaction_params)
 
-    broadcast_create
-    redirect_to card_comment_reactions_path(@comment.card, @comment)
+    broadcast_create(reaction)
+    redirect_to card_comment_reactions_path(@card, @comment)
   end
 
   def destroy
-    @reaction = @comment.reactions.find(params[:id])
-    @reaction.destroy
+    reaction = @comment.reactions.find(params[:id])
+    reaction.destroy
 
-    broadcast_remove
+    broadcast_remove(reaction)
   end
 
   private
@@ -33,12 +33,12 @@ class Cards::Comments::ReactionsController < ApplicationController
       params.expect(reaction: :content)
     end
 
-    def broadcast_create
-      @reaction.broadcast_append_to @reaction.comment, :comments,
+    def broadcast_create(reaction)
+      reaction.broadcast_append_to @comment, :comments,
         target: "reactions_comment_#{@comment.id}", partial: "cards/comments/reactions/reaction", locals: { comment: @comment }
     end
 
-    def broadcast_remove
-      @reaction.broadcast_remove_to @reaction.comment, :comments
+    def broadcast_remove(reaction)
+      reaction.broadcast_remove_to @comment, :comments
     end
 end