View Objects: Example View Object

studentGradeReportPresenter.js

var _ = require('underscore');
var DetermineStudentPassingStatus = require('./determineStudentPassingStatus');
var GetAverageGradeFromAssignments = require('./getAverageGradeFromAssignments');

var GradeReportPresenter = function(student) {
  this.student = student
}

GradeReportPresenter.prototype = _.extend(GradeReportPresenter.prototype, {

  present: function() {
    return _.compose(
      this.averageGrade,
      this.passingStatus,
      this.phoneNumber
    ).call(this, {})
  },

  averageGrade: function(presentedStudent) {
    // use a service object to determine average grade
    var assignments = this.student.assignments
    var averageGrade = new GetAverageGradeFromAssignments(assignments).run()
    presentedStudent.averageGrade = averageGrade
    
    return presentedStudent
  },

  passingStatus: function(presentedStudent) {
    // use a service object to determine passing status from assignments
    var id = this.student.id
    var determinePassingStatus = new DetermineStudentPassingStatus(id)
    var assignments = this.student.assignments
    var passingStatus = determinePassingStatus.fromAssignments(assignments)
    presentedStudent.isPassing = passingStatus

    return presentedStudent
  },

  phoneNumber: function(presentedStudent) {
    var phoneRegex = new RegExp(/(\d{3})(\d{3})(\d{4})/)
    var phone = this.student.phone
    presentedStudent.phone = phone.replace(phoneRegex, "$1-$2-$3")
    return presentedStudent
  }

})

module.exports = GradeReportPresenter;