Remove complex methods from follow model. Create instance method followed_by? on followable model concern. Some code improvements.

app/controllers/follows_controller.rb

@@ -3,8 +3,7 @@ class FollowsController < ApplicationController
   load_and_authorize_resource
 
   def create
-    followable = find_followable
-    @follow = Follow.create(user: current_user, followable: followable)
+    @follow = Follow.create(user: current_user, followable: find_followable)
     flash.now[:notice] = t("shared.followable.#{followable_translation_key(@follow.followable)}.create.notice_html")
     render :refresh_follow_button
   end
@@ -23,7 +22,7 @@ class FollowsController < ApplicationController
   end
 
   def followable_translation_key(followable)
-    followable.class.name.parameterize.gsub("-", "_")
+    followable.class.name.parameterize("_")
   end
 
 end

app/helpers/followables_helper.rb

@@ -1,9 +1,5 @@
 module FollowablesHelper
 
-  def followed?(user, followable)
-    Follow.followed?(user, followable)
-  end
-
   def followable_type_title(followable_type)
     t("activerecord.models.#{followable_type.underscore}.other")
   end
@@ -28,10 +24,7 @@ module FollowablesHelper
   end
 
   def find_or_build_follow(user, followable)
-    if followed?(user, followable)
-      return Follow.find_by(user: user, followable: followable)
-    end
-    Follow.new(user: user, followable: followable)
+    Follow.find_or_initialize_by(user: user, followable: followable)
   end
 
 end

app/models/concerns/followable.rb

@@ -6,4 +6,8 @@ module Followable
     has_many :followers, through: :follows, source: :user
   end
 
+  def followed_by?(user)
+    followers.include?(user)  
+  end
+
 end

app/models/follow.rb

@@ -6,15 +6,4 @@ class Follow < ActiveRecord::Base
   validates :followable_id, presence: true
   validates :followable_type, presence: true
 
-  scope(:by_user_and_followable, lambda do |user, followable|
-    where(user_id: user.id,
-          followable_type: followable.class.to_s,
-          followable_id: followable.id)
-  end)
-
-  def self.followed?(user, followable)
-    return false unless user
-    !! by_user_and_followable(user, followable).try(:first)
-  end
-
 end

app/views/follows/_follow_button.html.erb

@@ -1,7 +1,15 @@
 <span class="js-follow">
   <span class="followable-content">
 
-    <% unless followed?(current_user, follow.followable) %>
+    <% if follow.followable.followed_by?(current_user) %>
+
+      <%= link_to t('shared.unfollow'),
+                  follow_path(follow),
+                  method: :delete, remote: true,
+                  title: unfollow_text(follow.followable),
+                  class: 'button hollow' %>
+
+    <% else %>
 
       <%= link_to t('shared.follow'),
                   follows_path(followable_id: follow.followable.id,
@@ -10,14 +18,6 @@
                   title: follow_text(follow.followable),
                   class: 'button hollow' %>
 
-    <% else %>
-
-      <%= link_to t('shared.unfollow'),
-                  follow_path(follow),
-                  method: :delete, remote: true,
-                  title: unfollow_text(follow.followable),
-                  class: 'button hollow' %>
-
     <% end %>
 
   </span>