Function _makeVariant

lib/question.js:89–128

* Internal function, do not call directly. Create a variant object, do not write to DB. * @protected * * @param {Object} question - The question for the variant. * @param {Object} course - The course for the variant. * @param {Object} options - Options controlling the creati

(question, course, options, callback)

     * @param {function} callback - A callback(err, courseIssues, variant) function.
     */
    _makeVariant(question, course, options, callback) {
        debug('_makeVariant()');
        var variant_seed;
        if (_(options).has('variant_seed') && options.variant_seed != null) {
            variant_seed = options.variant_seed;
        } else {
            variant_seed = Math.floor(Math.random() * Math.pow(2, 32)).toString(36);
        }
        debug(`_makeVariant(): question_id = ${question.id}`);
        questionServers.getModule(question.type, (err, questionModule) => {
            if (ERR(err, callback)) return;
            questionModule.generate(question, course, variant_seed, (err, courseIssues, data) => {
                if (ERR(err, callback)) return;
                const hasFatalIssue = _.some(_.map(courseIssues, 'fatal'));
                var variant = {
                    variant_seed: variant_seed,
                    params: data.params || {},
                    true_answer: data.true_answer || {},
                    options: data.options || {},
                    broken: hasFatalIssue,
                };
                if (variant.broken) {
                    return callback(null, courseIssues, variant);
                }
                questionModule.prepare(question, course, variant, (err, extraCourseIssues, data) => {
                    if (ERR(err, callback)) return;
                    courseIssues.push(...extraCourseIssues);
                    const hasFatalIssue = _.some(_.map(courseIssues, 'fatal'));
                    var variant = {
                        variant_seed: variant_seed,
                        params: data.params || {},
                        true_answer: data.true_answer || {},
                        options: data.options || {},
                        broken: hasFatalIssue,
                    };
                    callback(null, courseIssues, variant);
                });
            });
        });
    },

    /**
    * Get a file that is generated by code.