var mongoose = require('mongoose');

var QcmQuestionSchema = new mongoose.Schema({
    num: Number,
    libelle: String,
    choices: [
        { type: mongoose.Schema.Types.ObjectId, ref: 'QcmChoice' }
    ]
}, {timestamps: true, toJSON: {virtuals: true}});

QcmQuestionSchema.methods.addChoice = function (id) {
    if (this.choices.indexOf(id) === -1) {
        this.choices.push(id);
    }
    return this.save();
};

QcmQuestionSchema.methods.removeChoice = function (id) {
    this.choices.remove(id);
    return this.save();
};

QcmQuestionSchema.methods.toJSONFor = function() {
    return {
        num: this.num,
        libelle: this.libelle,
        choices: this.choices.map(choice => choice.toJSONFor())
    };
};

mongoose.model('QcmQuestion', QcmQuestionSchema);