This is the table definition:

db.define_table('school_session',
    Field('school_session', 'reference session_master'),
    Field('admission_number', 'integer', notnull=True),
    Field('class_name', 'reference class_master'),
    Field('roll_number', 'integer', notnull=True))


This is the controller
            db.school_session.admission_number.writeable = False
            db.school_session.admission_number.default = admission_number
            form = crud.create(db.school_session)

I want to prevent the user from changing the field 'admission number' when 
the form is displayed as it is already being supplied with a validated 
default value. 

I thought that this code would work.
db.school_session.admission_number.writeable = False

How do I go about it?

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