Add followable specific notices to follows controller actions and render notice on AJAX JS response.

app/assets/javascripts/followable.js.coffee

@@ -1,4 +1,8 @@
 App.Followable =
 
-  update: (followable_id, button) ->
+  update: (followable_id, button, notice) ->
     $("#" + followable_id + " .js-follow").html(button)
+    if ($('[data-alert]').length > 0)
+      $('[data-alert]').replaceWith(notice)
+    else
+      $("body").append(notice)

app/controllers/follows_controller.rb

@@ -5,12 +5,14 @@ class FollowsController < ApplicationController
   def create
     followable = find_followable
     @follow = Follow.create(user: current_user, followable: followable)
+    flash.now[:notice] = t("shared.followable.#{followable_translation_key(@follow.followable)}.create.notice_html")
     render :refresh_follow_button
   end
 
   def destroy
     @follow = Follow.find(params[:id])
     @follow.destroy
+    flash.now[:notice] = t("shared.followable.#{followable_translation_key(@follow.followable)}.destroy.notice_html")
     render :refresh_follow_button
   end
 
@@ -20,4 +22,8 @@ class FollowsController < ApplicationController
     params[:followable_type].constantize.find(params[:followable_id])
   end
 
+  def followable_translation_key(followable)
+    followable.class.name.parameterize.gsub("-", "_")
+  end
+
 end

app/views/follows/refresh_follow_button.js.erb

@@ -1,2 +1,3 @@
 App.Followable.update("<%= dom_id(@follow.followable) %>",
-                      "<%= j render('follow_button', follow: @follow) %>")
+                      "<%= j render('follow_button', follow: @follow) %>",
+                      "<%= j render('layouts/flash') %>")