i want a error msg that the entry is already there in django forms for a particular field -

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I am using model forms. My form contains a code named tagged . If I enter tagged in the tagged field and then I am submitting the form if the entered tagis already exist in the database and It should say "Tag ID already exists" above the Tag ID field, then the form should not be stored in the database.

How Can I Do It

My Form 

  Class Inventory Items (Model Form): Class Meta: Model = Items   
 My item is getting an area in the table  tags  so if I am entering existing  tagid  and if I submit. It should throw up an indication or text or something like "the signal ID already exists"   
 
 
 Add it to your form method:  
  def clean_tagid (auto): data = self.cleaned_data ['tagid'] if item.objects.filter (tagid = data) .count (): Increase forms Validation error ("Tagged already exists") Return data

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