How to check for reserved subdomains with Merb and Datamapper

RailsTips reminded us to not forget to reserve subdomains for ourselves in Rails apps. Here’s how to do it in a multiple domain merb app.

 1 # model
       2 
       3   ReservedSubdomains = %w[backstage admin blog dev ftp mail pop pop3 imap smtp stage stats status www]
       4   
       5   validates_with_method :check_subdomain
       6   def check_subdomain
       7     if ReservedSubdomains.include?(self.subdomain)
       8       [false, "Subdomain '#{self.subdomain}' is not allowed."]
       9     else
      10       true
      11     end
      12   end

And here’s my site_spec.rb

 1 
       2 # SiteSpecHelper
       3 module SiteSpecHelper
       4   def valid_site_attributes(options = {})
       5     {
       6       :domain => 'http://www.firstmemorial.com',
       7       :folder => 'firstmemorialcom',
       8       :subdomain => 'firstmemorial'
       9     }.merge(options)
      10   end
      11   
      12   def destroy_all_sites
      13     Site.all.destroy!
      14   end
      15   
      16 end
      17 
      18 include SiteSpecHelper
      19 
      20 before(:each) do
      21   destroy_all_sites
      22   @site = Site.new(valid_site_attributes)
      23 end
      24 ..
      25 it "should not allow use of reserved subdomains" do
      26   Site::ReservedSubdomains.each do |reserved|
      27     @site.subdomain = reserved
      28     @site.save
      29     @site.should_not be_valid
      30   end
      31 end
      

      

       1 

       2 # SiteSpecHelper

       3 module SiteSpecHelper

       4   def valid_site_attributes(options = {})

       5     {

       6       :domain => ‘http://www.firstmemorial.com’,

       7       :folder => ‘firstmemorialcom’,

       8       :subdomain => ‘firstmemorial’

       9     }.merge(options)

      10   end

      11   

      12   def destroy_all_sites

      13     Site.all.destroy!

      14   end

      15   

      16 end

      17 

      18 include SiteSpecHelper

      19 

      20 before(:each) do

      21   destroy_all_sites

      22   site</span> = <span class="co">Site</span>.new(valid_site_attributes)
      <span class="no">23</span> <span class="r">end</span>
      <span class="no">24</span> ..
      <span class="no">25</span> it <span class="s"><span class="dl">&quot;</span><span class="k">should not allow use of reserved subdomains</span><span class="dl">&quot;</span></span> <span class="r">do</span>
      <span class="no">26</span>   <span class="co">Site</span>::<span class="co">ReservedSubdomains</span>.each <span class="r">do</span> |reserved|
      <span class="no">27</span>     <span class="iv">site.subdomain = reserved

      28     site</span>.save
      <span class="no">29</span>     <span class="iv">site.should_not be_valid

      30   end

      31 end

      

      
      
      
        
      
      
        
          
        
        
          
        
        
          
        
        
          
        
      
      
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