Merge commit 'ce195302' into develop

@@ -2,34 +2,24 @@ const mongoose = require("mongoose");
 
 const { Schema } = mongoose;
 
-const GroupSchema = new Schema({
-  members: { type: [String] },
-});
-
-const ChallengeSchema = new Schema({
+const ChallengeSchema = new Schema(
+  {
     challengeName: { type: String, required: true },
     startDate: { type: Object, required: true },
     endDate: { type: Object, required: true },
     durationPerSession: { type: String, required: true }, // '1d' means one day per session, '2w' means 2 weeks per session, '3m' means 3 months per session.
     goalPerSession: { type: Number, required: true }, // number of problems for one session
-  groups: { type: [GroupSchema], required: true }, // groups attending challenge, group of only one member supposed to be single
-});
+    isOpen: { type: Boolean },
+  },
+  {
+    collection: "challenge",
+  }
+);
 
 ChallengeSchema.statics.findByChallengeName = function (challengeName) {
   return this.findOne({ challengeName: challengeName });
 };
 
-ChallengeSchema.methods.addNewGroup = function (group) {
-  this.groups.push(group);
-  return this.save();
-};
-
-ChallengeSchema.methods.removeGroup = function (group_id) {
-  const idx = this.groups.findIndex((item) => item._id === group_id);
-  this.groups.splice(idx, 1);
-  return this.save();
-};
-
 ChallengeSchema.methods.getChallengeName = function () {
   return this.challengeName;
 };
@@ -50,10 +40,6 @@ ChallengeSchema.methods.getGoalPerSession = function () {
   return this.goalPerSession;
 };
 
-ChallengeSchema.methods.getGroups = function () {
-  return this.groups;
-};
-
 ChallengeSchema.methods.serialize = function () {
   return this.toJSON();
 };

+const mongoose = require("mongoose");
+
+const { Schema } = mongoose;
+
+const GroupSchema = new Schema({
+    members: [{ type: Schema.Types.ObjectId, ref: 'User' }]
+},{
+    collection: 'group'
+});
+
+const Group = mongoose.model('Group',GroupSchema);
+module.exports = Group;
\ No newline at end of file

+const mongoose = require("mongoose");
+
+const { Schema } = mongoose;
+
+const ParticipationSchema = new Schema({
+    sessionId: { type: Schema.Types.ObjectId, ref: 'Session' },
+    groupId: { type: Schema.Types.ObjectId, ref: 'Group' }
+},{
+    collection: 'particiaption'
+});
+
+const Participation = mongoose.model('Participation', ParticipationSchema);
+module.exports = Participation;
\ No newline at end of file

@@ -10,6 +10,8 @@ const ProblemSchema=new Schema({
     correctNum: {type: Number, required: true},
     count: { type: Number },
     category: {type:[String]}
+},{
+    collection: 'problem'
 });
 
 ProblemSchema.statics.findByProblemNum=function(problemNum){
@@ -59,5 +61,5 @@ ProblemSchema.methods.serialize=function(){
     return this.toJSON();
 }
 
-const Problem=mongoose.model('Problem',ProblemSchema);
-module.exports=Problem;
\ No newline at end of file
+const Problem = mongoose.model('Problem',ProblemSchema);
+module.exports = Problem;
\ No newline at end of file

+const mongoose = require("mongoose");
+
+const { Schema } = mongoose;
+
+const SessionSchema = new Schema({
+    challengeId: { type: Schema.Types.ObjectId, ref: 'Challenge' },
+    sessionStartDate: { type: Object },
+    sessionEndDate: { type: Object },
+    isOpen: { type: Boolean  }
+},{
+    collection: 'session'
+});
+
+const Session = mongoose.model('Session', SessionSchema);
+module.exports = Session;
\ No newline at end of file

@@ -10,9 +10,11 @@ const UserSchema = new Schema({
   userBJID: String,
   sovledBJ: Object,
   solvedBJ_date: Object,
-  friendList: [String],
+  friendList: [{ type: Schema.Types.ObjectId, ref: 'User' }],
   slackWebHookURL: String,
   goalNum: Number,
+},{
+  collection: 'user'
 });
 
 UserSchema.statics.findByUsername = function (username) {