chore(models): remove dead MongoDB Article, Comment, Tag models

Migration to MySQL is complete for these three entities — ArticleService,
CommentService, and TagService all use Sequelize exclusively. No remaining
references to the Mongoose versions anywhere in the codebase.

src/database/models/mongo/Article.js

@@ -1,60 +0,0 @@
-var mongoose = require('mongoose');
-var uniqueValidator = require('mongoose-unique-validator');
-var slug = require('slug');
-var User = mongoose.model('User');
-//var Membre = mongoose.model('Membre');
-
-var ArticleSchema = new mongoose.Schema({
-    slug: { type: String, lowercase: true, unique: true },
-    title: String,
-    description: String,
-    body: String,
-    membre: String,
-    // membre: Membre.schema,
-    // membre: { type: mongoose.Schema.Types.ObjectId, ref: 'Membre' },
-    author: { type: mongoose.Schema.Types.UUID, ref: 'User' },
-    comments: [{ type: mongoose.Schema.Types.ObjectId, ref: 'Comment' }],
-    favoritesCount: { type: Number, default: 0 },
-    tagList: [{ type: String }]
-}, { timestamps: true, toJSON: { virtuals: true } });
-
-ArticleSchema.plugin(uniqueValidator, { message: 'is already taken' });
-
-ArticleSchema.pre('validate', function (next) {
-    if (!this.slug) {
-        this.slugify();
-    }
-    next();
-});
-
-ArticleSchema.methods.slugify = function () {
-    this.slug = slug(this.title) + '-' + (Math.random() * Math.pow(36, 6) | 0).toString(36);
-};
-
-ArticleSchema.methods.updateFavoriteCount = function () {
-    var article = this;
-
-    return User.count({ favorites: { $in: [article._id] } }).then(function (count) {
-        article.favoritesCount = count;
-
-        return article.save();
-    });
-};
-
-ArticleSchema.methods.toJSONFor = function (user) {
-    return {
-        slug: this.slug,
-        title: this.title,
-        description: this.description,
-        body: this.body,
-        createdAt: this.createdAt,
-        updatedAt: this.updatedAt,
-        tagList: this.tagList,
-        membre: this.membre,
-        favorited: user ? user.isFavorite(this._id) : false,
-        favoritesCount: this.favoritesCount,
-        author: this.author.toProfileJSONFor(user)
-    };
-};
-
-mongoose.model('Article', ArticleSchema);

src/database/models/mongo/Comment.js

@@ -1,19 +0,0 @@
-var mongoose = require('mongoose');
-
-var CommentSchema = new mongoose.Schema({
-    body: String,
-    author: { type: mongoose.Schema.Types.UUID, ref: 'User' },
-    article: { type: mongoose.Schema.Types.ObjectId, ref: 'Article' }
-}, { timestamps: true, toJSON: { virtuals: true } });
-
-// Requires population of author
-CommentSchema.methods.toJSONFor = function (user) {
-    return {
-        id: this._id,
-        body: this.body,
-        createdAt: this.createdAt,
-        author: this.author.toProfileJSONFor(user)
-    };
-};
-
-mongoose.model('Comment', CommentSchema);

src/database/models/mongo/Tag.js

@@ -1,18 +0,0 @@
-const mongoose = require('mongoose');
-const uniqueValidator = require('mongoose-unique-validator');
-
-const TagSchema = new mongoose.Schema({
-    tagName: {
-        type: String,
-        required: true,
-        unique: true
-    },
-    articles: [{
-        type: mongoose.Schema.Types.ObjectId,
-        ref: 'Article'
-    }]
-})
-
-TagSchema.plugin(uniqueValidator);
-
-module.exports = mongoose.model('Tag', TagSchema);

src/database/models/mongo/index.js

@@ -10,9 +10,6 @@ exports.QcmCategory = require('./QcmCategory');
 exports.QcmQuestion = require('./QcmQuestion');
 exports.QcmChoice = require('./QcmChoice');
 exports.X2DataLog = require('./X2DataLog');
-exports.Article = require('./Article');
-exports.Comment = require('./Comment');
-exports.Tag = require('./Tag');
 exports.HWClan = require('./herowars/Clan');
 exports.HWMember = require('./herowars/Member');