The table definition:
db.define_table('student',
Field('admission_number', 'integer', notnull=True, unique=True),
Field('name', 'string', length=255, notnull=True))
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))
The controller
def add_student_to_session():
form = FORM(INPUT(_name='admission_number', requires=IS_NOT_EMPTY()),INPUT
(_type='submit'))
if form.accepts(request.vars, session):
admission_number = form.vars.admission_number
row = db.student(db.student.admission_number==admission_number)
if not row:
session.flash ='Admission number does not exist. Please check
and retry.'
redirect(URL(r=request, f='add_student_to_session'))
else:
db.school_session.admission_number.writable = False
db.school_session.admission_number.default = admission_number
form = crud.create(db.school_session)
student = db.student(row.id)
student_details = crud.update(db.student, student, readonly=True
)
return locals()The first form takes the input 'admission_number' and
checks the student database to see if that record exist.
If it does, it creates two forms 'form' and 'student_details'.
'student_details' is read only to show the user that the details being
entered in the second form is indeed for the required student, to avoid
problems that may arise due to the fact that the admission_number may exist
in the database but the user entered the wrong one.
In the view 'add_student_to_session.html', the following code is there
{{extend 'layout.html'}}
{{=form}}
{{=BEAUTIFY(response._vars)}}
it works file and the 'student_details' variable form show up due to the
BEAUTIFY keyword.
However, when I modify the code to
{{extend 'layout.html'}}
{{=student_details}}
{{=form}}
{{=BEAUTIFY(response._vars)}}
I get an error report saying that 'student_details not defined'. How can
that happen when it shows up when BEAUTIFY keyword displays the content of
the 'student_details' variable just fine?
--
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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