Examples of of a controller and view for the web2py + GAE + AMT application I wrote.

grade6.py

# Details here: http://nathanvan.wordpress.com/2011/02/09/general-purpose-amt-webapp-based-on-web2py/

# I realize that this approach creates a lot of boilerplate code, but 
# it gives me the flexibility I need to make a bunch of different versions
# without bloating a large assignment function. At this point, I just
# need the darn thing to work!
# -- nathanvan 1/20/2011
 
import urllib

def grade6_test2_problem35_partA_version1():
    ######################
    # build the form 
    ######################
    
    # Only have one image for this rubric. 
    studentImage = "../static/locationOfImage/%s.png" % request.get_vars.studentIds
    
    likertExplanation = ['Everything is correct.', 
                         'Minor errors are present.', 
                         'The explanation is wrong.', 
                         'The explanation is either blank or can\'t be read.']
    
    likertRightAnswer = ['Yes', 'No', 'Impossible to tell']
    
    form = SQLFORM.factory(
        Field('explanation', 
              widget=SQLFORM.widgets.radio.widget,
              requires=IS_IN_SET(likertExplanation,
                         error_message=T('Please choose a rating for the explanation.'))
              ),
        Field('rightAnswer',
              widget=horizontal_radios, 
              requires=IS_IN_SET(likertRightAnswer,
                                 error_message=T('Please choose a response.'))),
        Field('comment', widget=SQLFORM.widgets.text.widget),
        hidden={'timestart':request.get_vars.timestart,
                'assignmentId':request.get_vars.assignmentId,
                'experimentId':request.get_vars.experimentId,
                'workerId':request.get_vars.workerId,
                'studentIds':request.get_vars.studentIds,
                'rubricCode':request.get_vars.rubricCode,
                'studentIds':request.get_vars.studentIds,
                'width':'tmp',
                'height':'tmp', 
                'element':'tmp',
                'value':'tmp'}
        )

            
    if form.accepts(request.vars): #, session):
        ######################
        # do the grading and send the results to the commit step 
        ######################
        rightAnswer = request.post_vars.rightAnswer
        explanation = request.post_vars.explanation
        
        subscore1 = 0
        if  rightAnswer == likertRightAnswer[0]:
            #Yes 
            subscore1 = 1     
        elif rightAnswer == likertRightAnswer[1]:
            #No 
            subscore1 = 0
        elif rightAnswer == likertRightAnswer[2]:
            #Impossible to tell  
            subscore1 = None
        
        if  explanation == likertExplanation[0]:
            #'Everything is correct.', 
            subscore2 = 1     
        elif explanation == likertExplanation[1]:
            #'Minor errors are present.', 
            subscore2 = .5
        elif explanation == likertExplanation[2]:
            #'The explanation is wrong.', 
            subscore2 = 0
        elif explanation == likertExplanation[3]:
            #'The explanation is either blank or can\'t be read.']
            subscore2 = None
        else:
            return BEAUTIFY('The explanation "%s" did not match an entry on the likert scale.'%explanation)
        
        if subscore1 != None and subscore2 != None:
            subscore = subscore1 + subscore2 
        else:
            subscore = None 
            
        #Build the forwarding packet. See the bottom of landing(): for an explanation of this coding pattern. 
        # the following lists just have single entries since this rubric did not repeat students.  
        extraURLvariables = {'studentIds':request.post_vars.studentIds,
                             'rawAnswers':"%s:%s" % (rightAnswer, explanation),
                             'subscores':subscore,
                             }
        extraURLvariables.update(request.post_vars)
        form_data = urllib.urlencode(extraURLvariables)
        redirect( '../default/commitRubric?%s' % form_data )        
        
    elif form.errors:
        #response.flash = 'form has errors <\br>%s' % BEAUTIFY(form.errors)
        response.flash = 'Please correct the errors in the form.'
        
    return dict(form=form,studentImage=studentImage)

grade6_test2_problem35_partA_version1.html

{{extend 'rubricShell.html'}}

<h3>Please grade the following math question</h3>
<p><img alt="" border=2 src="{{=studentImage}}" /></p>

{{=form.custom.begin}}
{{ ## The following three calls set up the tracking of users clicking on form elements. }}
{{form.element(_name='rightAnswer')['_onClick']='tracktime("rightAnswer");'}}
{{form.element(_name='explanation')['_onClick']='tracktime("explanation");'}}
{{form.element(_name='comment')['_onClick']='tracktime("comment");'}}

{{# The <b>{{=prevMode}}</b> are for the informed consent during preview mode.}}
<b>{{=prevMode}}</b>Did the student give the correct answer (XX pieces of ribbon)?
<div>{{=form.custom.widget.rightAnswer}}</div>

<br /><b>{{=prevMode}}</b>Rate the quality of the student's explanation.
<div>{{=form.custom.widget.explanation}}</div>

<br /><b>{{=prevMode}}</b>Please provide any comments you may have below, we appreciate your input!
<div>{{=form.custom.widget.comment}}</div>
{{ if request.get_vars.assignmentId != 'ASSIGNMENT_ID_NOT_AVAILABLE':}}
{{=form.custom.submit}}
{{else:}}
<input type='submit' value='Submit' disabled>
{{pass}}

{{=form.custom.end}}