stories must have at least one tag

app/models/story.rb

@@ -16,7 +16,7 @@ class Story < ActiveRecord::Base
   MAX_EDIT_MINS = 30
 
   attr_accessor :vote, :story_type, :already_posted_story, :fetched_content
-  attr_accessor :tags_to_add, :tags_to_delete
+  attr_accessor :new_tags, :tags_to_add, :tags_to_delete
 
   after_save :deal_with_tags
   before_create :assign_short_id
@@ -35,7 +35,12 @@ class Story < ActiveRecord::Base
         errors.add(:url, "is not valid")
       end
     elsif self.description.to_s.strip == ""
-      self.errors(:description, "must contain text if no URL posted")
+      errors.add(:description, "must contain text if no URL posted")
+    end
+
+    if !(self.new_tags || []).reject{|t| t.to_s.strip == "" }.any?
+      errors.add(:base, "Must have at least one tag.  If no tags apply to " +
+        "your content, it probably doesn't belong here.")
     end
   end
 
@@ -138,6 +143,7 @@ class Story < ActiveRecord::Base
   def tags_a=(new_tags)
     self.tags_to_delete = []
     self.tags_to_add = []
+    self.new_tags = new_tags
 
     self.tags.each do |tag|
       if !new_tags.include?(tag.tag)

spec/models/story_spec.rb

@@ -28,6 +28,11 @@ describe Story do
     expect { Story.make!(:title => ("hello" * 100)) }.to raise_error
   end
 
+  it "must have at least one tag" do
+    expect { Story.make!(:tags_a => nil) }.to raise_error
+    expect { Story.make!(:tags_a => [ "", " " ]) }.to raise_error
+  end
+
   it "checks for invalid urls" do
     expect { Story.make!(:title => "test", :url => "http://gooses.com/")
       }.to_not raise_error

spec/support/blueprints.rb

@@ -11,6 +11,7 @@ Story.blueprint do
   user_id { User.make }
   title { "story title #{sn}" }
   url { "http://example.com/#{sn}" }
+  tags_a { [ "tag1", "tag2" ] }
 end
 
 Tag.blueprint do