Change allow_domain to Array.

app/models/r_template.rb

@@ -16,7 +16,7 @@ class RTemplate
   field :sold, :type => Boolean, :default => false
   field :git_url
   field :git_branch
-  field :allow_domain, type: String, default: ''
+  field :allow_domain #change from String to Array
   field :installed_site_tokens, type: Array, default: []
   mount_uploader :template_zip, AssetUploader
 
@@ -25,6 +25,26 @@ class RTemplate
 
   accepts_nested_attributes_for :template_image_files, :allow_destroy => true
   accepts_nested_attributes_for :template_psd_file, :allow_destroy => true
+  before_save do
+    if self.allow_domain.class == String
+      self.allow_domain = self.allow_domain.split(",").map{|s| s.strip}
+    elsif self.allow_domain.nil?
+      self.allow_domain = []
+    end
+  end
+  after_initialize do
+    unless self.new_record?
+      save_flag = false
+      if self.allow_domain.class == String
+        self.allow_domain = self.allow_domain.split(",").map{|s| s.strip}
+        save_flag = true
+      elsif self.allow_domain.nil?
+        self.allow_domain = []
+        save_flag = true
+      end
+      self.save(:validate=>false) if save_flag
+    end
+  end
   def template_zip(origin_flag=false)
     if self.git_url.blank? || self.git_branch.blank? || origin_flag
       super()