已经实现关注 取消关注 是否关注 关注我的某个类对象（这里要Recue）

lib/acts_as_followable.rb

@@ -1,9 +1,14 @@
 require "acts_as_followable/version"
 
 module ActsAsFollowable
+  extend ActiveSupport::Autoload
   autoload :Followable,     'acts_as_followable/followable'
-  # autoload :Follower,   'acts_as_followable/follower'
   autoload :FollowableExt,  'acts_as_followable/followable_ext'
 
-  require 'acts_as_followable/railtie' if defined?(Rails) && Rails::VERSION::MAJOR >= 3
+  # require 'acts_as_followable/railtie' if defined?(Rails) && Rails::VERSION::MAJOR >= 3
+  ActiveSupport.on_load(:active_record) do 
+    include ActsAsFollowable::Followable
+    include ActsAsFollowable::Follower
+  end
+
 end

lib/acts_as_followable/followable.rb

@@ -3,11 +3,11 @@ module ActsAsFollowable
 
     def self.included(base)
       base.extend         ClassMethods
+      base.send :include, InstanceMethods
     end
 
     module ClassMethods
       def acts_as_followable #This means can be followed - 被关注
-        include ActsAsFollowable::Followable::InstanceMethods
         include ActsAsFollowable::FollowableExt
 
         has_many :followers, as: :followable, dependent: :destroy, class_name: 'Follow'
@@ -21,15 +21,53 @@ module ActsAsFollowable
         self.followers.count
       end
 
-      def followers(follower_type, options = {})
+      def followers_by_type(follower_type, options = {})
-        followers = follower_type.constantize.
+        klass = follower_type.constantize
-          joins(:follows).
+        ids = Follow.
-          where('follows.followable_id' => self.id,
+          where('followable_id' => self.id,
-                'follows.followable_type' => class_name(self),
+                'followable_type' => class_name(self),
-                'follows.follower_type' => follower_type
+                'follower_type' => follower_type
-        )
+        ).pluck('follower_id')
-        return followers
+        return klass.find(ids)
       end
     end
   end
+
+  module Follower
+    module ClassMethods
+      def acts_as_follower
+        include ActsAsFollowable::FollowableExt
+        has_many :follows, as: :follower, dependent: :destroy, class_name: 'Follow'
+      end
+    end
+
+    def self.included(receiver)
+      receiver.extend         ClassMethods
+      receiver.send :include, InstanceMethods
+    end
+
+    module InstanceMethods
+      #   # 1:   关注某人
+      #   # 2:   取消关注
+      #   # 3:   是否关注
+      #   # 4:   关注了某个 model 多少个 obj
+      def follow(obj)
+        self.follows.find_or_create_by(followable_id: obj.id, followable_type: class_name(obj)) if obj != self
+      end
+
+      def unfollow(obj)
+        get_follow_by_obj(obj).destroy
+      end
+
+      def follow?(obj)
+        !get_follow_by_obj(obj).blank?
+      end
+
+      private
+      def get_follow_by_obj(obj)
+        self.follows.find_by(followable_id: obj.id, followable_type: class_name(obj))
+      end
+
+    end
+  end
 end

lib/acts_as_followable/railtie.rb

@@ -3,13 +3,11 @@ require 'rails'
 
 module ActsAsFollowable
   class Railtie < Rails::Railtie
-
     initializer "acts_as_followable.active_record" do |app|
       ActiveSupport.on_load :active_record do
-        # include ActsAsFollowable::Follower
         include ActsAsFollowable::Followable
+        include ActsAsFollowable::Follower
       end
     end
-
   end
 end