Optimal way for django template to get random line from included file

I want to add a random slogan to my base template. I realize the easy way to do this is to have a db table with my slogans, get a random one, and pass it to the template.

The question is, how do I do it without using the db? In my base template, I want to include a file with a bunch of slogans, one on each line, and have the template randomly pick one. I know the random filter will pick a random value from a list, so somehow,开发者_如何学编程 I need to include the slogan file, but as a list.

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Two options I see:

1) Use a context-processor to load this random quote (i.e. from a flat file), then insert into context. Example:

# create your own context-processor file (myutils/context_processors.py)
def my_random_quote_processor(request):
    context = {}

    # generate your string you want in template
    # ....
    context['RANDOM_QUOTE'] = my_random_quote

    return context


# in settings.py, tell django to include your processor
TEMPLATE_CONTEXT_PROCESSORS = (
    # ...,
    'myutils.context_processors.my_random_quote_processor'
)


# in your base template, just include the template var
<p>quote: {{ RANDOM_QUOTE }}</p>


# make sure in your views, you set the context_instance
def my_view(request):
    # ...
    return render_to_response('myapp/mytemplate.html', c, 
                              context_instance=RequestContext(request))

2) Create a custom template-tag where you load the quote from a flat file, etc.: http://docs.djangoproject.com/en/dev/howto/custom-template-tags/

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I would vote for a template tag. Store the random quote in a text file with each quote on a separate line. Then in the template tag read in a line at random, a nice explanation of how to do that here: http://www.regexprn.com/2008/11/read-random-line-in-large-file-in.html. Reproduced below:

import os,random

filename="averylargefile" file =
open(filename,'r')

#Get the total file size file_size = os.stat(filename)[6]

while 1:
  #Seek to a place in the file which is a random distance away
  #Mod by file size so that it wraps around to the beginning
  file.seek((file.tell()+random.randint(0,file_size-1))%file_size)

  #dont use the first readline since it may fall in the middle of a line
  file.readline()
  #this will return the next (complete) line from the file
  line = file.readline()

  #here is your random line in the file
  print line

Finally return the line so your template tag can print it out.

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If your slogans base is pretty small you can use pickle module. And operate your base like a normal list. http://docs.python.org/library/pickle.html

But i think the best solution is to keep your slogans database in real db

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Just found out this snippet: http://djangosnippets.org/snippets/2121/ will solve it.