Class: Grade

Inherits:
ActiveRecord::Base
  • Object
show all
Defined in:
app/models/grade.rb

Constant Summary collapse

FIRST_GRADE_ROW = 
2
FIRST_GRADE_COL = 
4

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.export_grade_book_to_spreadsheet(course, file_path) ⇒ Object

To export the grades in spreadheet for offline grading.



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# File 'app/models/grade.rb', line 160

def self.export_grade_book_to_spreadsheet(course, file_path)
  Spreadsheet.client_encoding = 'UTF-8'
  grade_book = Spreadsheet::Workbook.new
  grade_sheet = grade_book.create_worksheet
  grade_sheet.name = "#{course.short_name}"

  # print course id and assignment id
  grade_sheet[0, 0] = course.id
  course.assignments.each_with_index do |assignment, i|
    grade_sheet[0, FIRST_GRADE_COL+i] = assignment.id
  end
  assignment_count = course.assignments.count
  grade_sheet[0, FIRST_GRADE_COL+assignment_count] = -1
  grade_sheet.row(0).hidden = true

  # print details
  grade_sheet[1, 1] = "First Name"
  grade_sheet[1, 2] = "Last Name"
  grade_sheet[1, 3] = "Team Name"

  grade_sheet.column(0).hidden=true
  course.assignments.each_with_index do |assignment, j|
    grade_sheet[1, FIRST_GRADE_COL+j] = assignment.name
  end
  grade_sheet[1, FIRST_GRADE_COL+assignment_count] = "Final Grade"

  # print students' names and grades
  students = course.registered_students_or_on_teams.sort do |x, y|
    r = (self.find_student_team(course.id, x.id).try(:name) || "")<=> (self.find_student_team(course.id, y.id).try(:name) || "")
    r = x.first_name <=> y.first_name if r == 0
    r = x.last_name <=> y.last_name if r == 0
    r
  end
  students.each_with_index do |student, i|
    grade_sheet[FIRST_GRADE_ROW+i, 0] = student.id
    grade_sheet[FIRST_GRADE_ROW+i, 1] = student.first_name
    grade_sheet[FIRST_GRADE_ROW+i, 2] = student.last_name
    grade_sheet[FIRST_GRADE_ROW+i, 3] = self.find_student_team(course.id, student.id).try(:name)
    course.assignments.each_with_index do |assignment, j|
      score=Grade.get_grade(course.id, assignment.id, student.id).try(:score) || ""
      if !course.grading_rule.validate_letter_grade(score)
        unless score.blank?
          score=score.to_f
        end

      end
      grade_sheet[FIRST_GRADE_ROW+i, FIRST_GRADE_COL+j] = score
    end
    grade_sheet[FIRST_GRADE_ROW+i, FIRST_GRADE_COL+assignment_count] = Grade.get_final_grade(course.id, student.id)
  end
  grade_book.write(file_path)
end

.get_final_grade(course_id, student_id) ⇒ Object

To get the final grade of the student for a particular course.



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# File 'app/models/grade.rb', line 68

def self.get_final_grade(course_id, student_id)
  grade = Grade.where(course_id: course_id).where(student_id: student_id).where(:assignment_id => -1).first
  if grade.nil? || !grade.is_student_visible?
    ""
  else
    Grade.decrypt_score(grade.score, grade.course_id, grade.student_id)
  end
end

.get_grade(course_id, assignment_id, student_id) ⇒ Object

To fetch the entry with matching course, assignment and student.



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# File 'app/models/grade.rb', line 63

def self.get_grade(course_id, assignment_id, student_id)
  grade = Grade.where(course_id: course_id).where(student_id: student_id).where(:assignment_id => assignment_id).first
end

.get_grades_for_student_per_course(course, student) ⇒ Object

To fetch the grade of student.



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# File 'app/models/grade.rb', line 49

def self.get_grades_for_student_per_course (course, student)
  grades = {}
  Grade.where(course_id: course.id).where(student_id: student.id).each do |grade|
    if grade.assignment_id < 0
      grade.score = Grade.decrypt_score(grade.score, grade.course_id, grade.student_id)
      grades["final"] = grade
    else
      grades[grade.assignment.id] = grade
    end
  end
  grades
end

.give_grade(course_id, assignment_id, student_id, score, is_student_visible = nil, last_graded_by = nil) ⇒ Object

To returns a specific grade for one assignment of given course_id, student_id and assignment_id. This function is

useful for controller to test whether the score is exists or not.



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# File 'app/models/grade.rb', line 79

def self.give_grade(course_id, assignment_id, student_id, score, is_student_visible = nil, last_graded_by = nil)
  if assignment_id > 0
    if Assignment.find(assignment_id).nil?
      return false
    end
  end

  grading_result = false
  student = User.find(student_id)
  course = Course.find(course_id)
  if course.registered_students_or_on_teams.include?(student)
    grade = Grade.get_grade(course_id, assignment_id, student_id)
    if grade.nil?
      grade = Grade.new({:course_id => course_id, :assignment_id => assignment_id, :student_id => student_id,
                         :score => score, :is_student_visible => is_student_visible, :last_graded_by => last_graded_by})
    end

    if course.grading_rule.validate_score(score)
      grade.score = score.upcase
      unless is_student_visible.nil?
        grade.is_student_visible = is_student_visible
      end
      unless last_graded_by.nil?
        if grade.last_graded_by.nil?
          grade.last_graded_by = last_graded_by
        end
      end
      grading_result = grade.save
    else
      grading_result = false
    end
  end
  grading_result
end

.give_grades(grades, last_graded_by = nil) ⇒ Object

To assign grades for to multiple students.



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# File 'app/models/grade.rb', line 115

def self.give_grades(grades, last_graded_by = nil)
  grades.each do |grade_entry|
    # FIXME: error handling for update failure
    self.give_grade(grade_entry[:course_id], grade_entry[:assignment_id], grade_entry[:student_id], grade_entry[:score], grade_entry[:is_student_visible], last_graded_by)
  end
end

.import_grade_book_from_spreadsheet(file_path, current_course_id) ⇒ Object

To import the grades into the gradebook from spreadsheet.



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# File 'app/models/grade.rb', line 147

def self.import_grade_book_from_spreadsheet(file_path, current_course_id)
  Spreadsheet.client_encoding = 'UTF-8'
  grade_book = Spreadsheet.open(file_path)
  grade_sheet = grade_book.worksheet(0)
  if validate_sheet(grade_sheet, current_course_id)
    import_scores(grade_sheet)
    return true
  else
    return false
  end
end

.mail_drafted_grade(course_id, hostname, faculty_email = nil) ⇒ Object

To notify students about the grade that were drafted by professor till now.



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# File 'app/models/grade.rb', line 123

def self.mail_drafted_grade(course_id, hostname, faculty_email=nil)
  draft_grades = Grade.find_all_by_is_student_visible_and_course_id(false, course_id)
  draft_grades.each do |grade|
    grade.is_student_visible = true
    grade.save
    unless (grade.score.blank?)
      grade.send_feedback_to_student(hostname, faculty_email)
    end
  end
end

.mail_final_grade(course_id, hostname, faculty_email = nil) ⇒ Object

To send the final grade mail to students



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# File 'app/models/grade.rb', line 135

def self.mail_final_grade(course_id, hostname, faculty_email=nil)
  final_grades = Grade.find_all_by_course_id_and_assignment_id(course_id, -1)
  final_grades.each do |grade|
    unless (grade.score.blank?)
      grade.is_student_visible = true
      grade.save
      grade.send_feedback_to_student(hostname, faculty_email)
    end
  end
end

Instance Method Details

#decrypt_score ⇒ Object

To decrpyt the score if it is a final grade.



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# File 'app/models/grade.rb', line 42

def decrypt_score
  if self.assignment_id < 0
    self.score = Grade.decrypt_score(self.score, self.course_id, self.student_id)
  end
end

#format_score ⇒ Object

To format and encrypt the score in correct format before saving into the database.



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# File 'app/models/grade.rb', line 34

def format_score
  self.score = GradingRule.format_score(self.course.id, self.score)
  if self.assignment_id < 0
    self.score = Grade.encrypt_score(self.score, self.course_id, self.student_id)
  end
end

#make_feedback_for_final_grade ⇒ Object

To make the email body for the final grade awarded by the professor



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# File 'app/models/grade.rb', line 230

def make_feedback_for_final_grade
  feedback = "Final grade has been assigned for "
  feedback += self.course.name + "\n"
end

#make_feedback_for_one_assignment ⇒ Object

To make the email body for the assignment graded by professor



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# File 'app/models/grade.rb', line 214

def make_feedback_for_one_assignment
  feedback = "Grade has been submitted for "
  if !self.assignment.task_number.nil? and self.assignment.task_number != "" and !self.assignment.name.nil? and self.assignment.name !=""
    feedback += "#{self.assignment.name} (#{self.assignment.task_number}) of "
  end
  feedback +=self.course.name
  feedback += "\nGrade earned for this "
  feedback += self.course.nomenclature_assignment_or_deliverable
  feedback += " is: "
  feedback += self.score.to_s
  feedback += " / "
  feedback += self.assignment.formatted_maximum_score
  feedback += "\n"
end

#send_feedback_to_student(hostname, faculty_email = nil) ⇒ Object

To send the feedback to the student.



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# File 'app/models/grade.rb', line 236

def send_feedback_to_student(hostname, faculty_email=nil)
  if assignment_id > 0
    feedback = make_feedback_for_one_assignment
  else
    feedback = make_feedback_for_final_grade
  end
  url = hostname + "/courses/#{self.course.id}/student_grades"
  options = {:to => self.student.email,
             :cc => faculty_email,
             :subject => "Grade for " + self.course.name,
             :message => feedback,
             :url_label => "Click here to view grade",
             :url => url
  }

  GenericMailer.email(options).deliver
end