772 def to_csv(survey):

   772 def to_csv(survey_view):

   774   """

   774 

   775 

   775   Args:

   776   # get header and properties

   776       survey_view: instance of the SurveyView

   777   header = _get_csv_header(survey)

   777   """

   778   leading = ['user', 'created', 'modified']

   778 

   779   properties = leading + survey.survey_content.orderedProperties()

   779   def wrapper(survey):

   780 

   780     """Wrapper function.

   781   try:

   781     """

   782     first = survey.getRecords().run().next()

   782     survey_logic = survey_view.getParams()['logic']

   783   except StopIteration:

   783     record_logic = survey_logic.getRecordLogic()

   784     # bail out early if survey_records.run() is empty

   784 

   785     return header, survey.link_id

   785     # get header and properties

   786 

   786     header = _get_csv_header(survey)

   787   # generate results list

   787     leading = ['user', 'created', 'modified']

   788   recs = survey.getRecords().run()

   788     properties = leading + survey.survey_content.orderedProperties()

   789   recs = _get_records(recs, properties)

   789 

   790 

   790     # retrieve the query of the data to export

   791   # write results to CSV

   791     fields = {'survey': survey}

   792   output = StringIO.StringIO()

   792     record_query = record_logic.getQueryForFields(fields)

   793   writer = csv.writer(output)

   793 

   794   writer.writerow(properties)

   794     try:

   795   writer.writerows(recs)

   795       first = record_query.run().next()

   796 

   796     except StopIteration:

   797   return header + output.getvalue(), survey.link_id

   797       # bail out early if survey_records.run() is empty

   798       return header, survey.link_id

   799   

   800     # generate results list

   801     recs = record_query.run()

   802     recs = _get_records(recs, properties)

   803   

   804     # write results to CSV

   805     output = StringIO.StringIO()

   806     writer = csv.writer(output)

   807     writer.writerow(properties)

   808     writer.writerows(recs)

   809   

   810     return header + output.getvalue(), survey.link_id

   811   return wrapper