How to obtain and save IP address in the database request.client

db.define_table('page_comments', 

    Field('client_ip','string',readable=False, writable=False, default=request.client),

    Field('approved', 'boolean', default=True),

    Field('user_comment', 'text', default="",required=True,notnull=True, requires=[IS_NOT_EMPTY(), 

            IS_LENGTH(2**28)],label=T("Your comment")),

    Field('comment_on', 'datetime', default=request.now, writable=False, readable=False))

def my_comments():

    form=SQLFORM(db.page_comments, fields = ['user_comment'])

    show_all_comments = db(db.page_comments).select()

    if form.process().accepted:

        request.session='Thanks for your comment'

    return dict(form=form,show_all_comments=show_all_comments)

{{#extend 'layout.html'}}

<h1>Leave your comment...and your IP address</h1>



{{=form}}



{{for row in show_all_comments:}}

    <p>{{=row.id}}:  ({{=row.client_ip}}) {{=row.user_comment}}</p>

{{pass}}



<h2>   Standard display </h2>

    <p> {{=show_all_comments}} </p>