Escape percent sign in QuerySet.extra()

Hi,
I want use postgresql pg_trgm module in django. pg_trgm defines special operator percent sign. How should I escape it in django query extra method?

# Pure SQL
SELECT content, similarity(content, 'text') AS sml
  FROM table
  WHERE content % 'text'
  ORDER BY sml DESC, content;

# Extra throws IndexError 'tuple index out of range'
# I tried escape % with %%, or \%, but it throws same exception
objects = MyModel.objects.extra(
    select={'rank': 'similarity(content, %s)'},
    select_params=[content],
    where='content % %s',
    params=[content],
    order_by=['-rank']
)

# Raw query works fine
objects = MyModel.objects.raw('''SELECT *, similarity(content, %s) AS rank FROM table WHERE content %% %s ORDER BY rank DESC LIMIT 1''', [content, content])

How should I escape persent sign in extra() method?

Thank you!

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