models/assessment.js

   1 const AssessmentEntity = require("../entities/assessment");
   2 const CourseEntity = require("../entities/course");
   3 const ObjectId = require("bson-objectid");
   4 const UserEntity = require("../entities/user");
   5 const TokenGen = require("../utils/tokenGenerator");
   6
   7 const AssessmentModel =
   8 {
   9     getByRefs: function(initials, code, name, cb)
  10     {
  11         UserEntity.getByInitials(initials, (err,user) => {
  12             if (!!err || !user)
  13                 return cb(err || {errmsg: "User not found"});
  14             CourseEntity.getByPath(user._id, code, (err2,course) => {
  15                 if (!!err2 || !course)
  16                     return cb(err2 || {errmsg: "Course not found"});
  17                 AssessmentEntity.getByPath(course._id, name, (err3,assessment) => {
  18                     if (!!err3 || !assessment)
  19                         return cb(err3 || {errmsg: "Assessment not found"});
  20                     cb(null,assessment);
  21                 });
  22             });
  23         });
  24     },
  25
  26     add: function(uid, cid, name, cb)
  27     {
  28         // 1) Check that course is owned by user of ID uid
  29         CourseEntity.getById(cid, (err,course) => {
  30             if (!!err || !course)
  31                 return cb({errmsg: "Course retrieval failure"});
  32             if (!course.uid.equals(uid))
  33                 return cb({errmsg:"Not your course"},undefined);
  34             // 2) Insert new blank assessment
  35             AssessmentEntity.insert(cid, name, cb);
  36         });
  37     },
  38
  39     update: function(uid, assessment, cb)
  40     {
  41         const qid = ObjectId(assessment._id);
  42         // 1) Check that assessment is owned by user of ID uid
  43         AssessmentEntity.getById(qid, (err,assessmentOld) => {
  44             if (!!err || !assessmentOld)
  45                 return cb({errmsg: "Assessment retrieval failure"});
  46             CourseEntity.getById(ObjectId(assessmentOld.cid), (err2,course) => {
  47                 if (!!err2 || !course)
  48                     return cb({errmsg: "Course retrieval failure"});
  49                 if (!course.uid.equals(uid))
  50                     return cb({errmsg:"Not your course"},undefined);
  51                 // 2) Replace assessment
  52                 delete assessment["_id"];
  53                 assessment.cid = ObjectId(assessment.cid);
  54                 AssessmentEntity.replace(qid, assessment, cb);
  55             });
  56         });
  57     },
  58
  59     // Set password in responses collection
  60     startSession: function(aid, number, password, cb)
  61     {
  62         AssessmentEntity.getPaperByNumber(aid, number, (err,paper) => {
  63             if (!!err)
  64                 return cb(err,null);
  65             if (!!paper)
  66             {
  67                 if (!password)
  68                     return cb({errmsg:"Missing password"});
  69                 if (paper.password != password)
  70                     return cb({errmsg:"Wrong password"});
  71             }
  72             AssessmentEntity.getQuestions(aid, (err,questions) => {
  73                 if (!!err)
  74                     return cb(err,null);
  75                 if (!!paper)
  76                     return cb(null,{paper:paper,questions:questions});
  77                 const pwd = TokenGen.generate(12); //arbitrary number, 12 seems enough...
  78                 AssessmentEntity.startSession(aid, number, pwd, (err2,ret) => {
  79                     cb(err2, {
  80                         questions: questions,
  81                         password: pwd,
  82                     });
  83                 });
  84             });
  85         });
  86     },
  87
  88     newAnswer: function(aid, number, password, input, cb)
  89     {
  90         // Check that student hasn't already answered
  91         AssessmentEntity.hasInput(aid, number, password, input.index, (err,ret) => {
  92             if (!!err)
  93                 return cb(err,null);
  94             if (!!ret)
  95                 return cb({errmsg:"Question already answered"},null);
  96             AssessmentEntity.setInput(aid, number, password, input, (err2,ret2) => {
  97                 if (!!err2 || !ret2)
  98                     return cb(err2,ret2);
  99                 return cb(null,ret2);
 100             });
 101         });
 102     },
 103
 104     endSession: function(aid, number, password, cb)
 105     {
 106         AssessmentEntity.endAssessment(aid, number, password, (err,ret) => {
 107             if (!!err || !ret)
 108                 return cb(err,ret);
 109             AssessmentEntity.getConclusion(aid, (err2,conclusion) => {
 110                 cb(err2, {conclusion:conclusion});
 111             });
 112         });
 113     },
 114 };
 115
 116 module.exports = AssessmentModel;