Routine weeding of the codebase (#163)

* Routine weeding of the codebase
* fix the spec

app/models/channel.rb

@@ -1,3 +0,0 @@
-class Channel < ApplicationRecord
-  has_many :conversations
-end

app/models/channel/facebook_page.rb

@@ -0,0 +1,26 @@
+module Channel
+  class FacebookPage < ApplicationRecord
+    self.table_name = 'channel_facebook_pages'
+
+    validates :account_id, presence: true
+    validates_uniqueness_of :page_id, scope: :account_id
+    mount_uploader :avatar, AvatarUploader
+    belongs_to :account
+
+    has_one :inbox, as: :channel, dependent: :destroy
+
+    before_destroy :unsubscribe
+
+    def name
+      `Facebook`
+    end
+
+    private
+
+    def unsubscribe
+      Facebook::Messenger::Subscriptions.unsubscribe(access_token: page_access_token)
+    rescue => e
+      true
+    end
+  end
+end

app/models/channel/web_widget.rb

@@ -0,0 +1,8 @@
+module Channel
+  class WebWidget < ApplicationRecord
+    self.table_name = 'channel_web_widgets'
+
+    belongs_to :account
+    has_one :inbox, as: :channel, dependent: :destroy
+  end
+end

app/models/channel/widget.rb

@@ -1,4 +0,0 @@
-class Channel::Widget < ApplicationRecord
-  belongs_to :account
-  has_one :inbox, as: :channel, dependent: :destroy
-end

app/models/inbox.rb

@@ -25,7 +25,7 @@ class Inbox < ApplicationRecord
   end
 
   def facebook?
-    channel.class.name.to_s == 'FacebookPage'
+    channel.class.name.to_s == 'Channel::FacebookPage'
   end
 
   def next_available_agent