Class: LSECourses::Course

Inherits:
Object
  • Object
show all
Defined in:
lib/lse_courses/course.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(opts = {}) ⇒ Course

Returns a new instance of Course.



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# File 'lib/lse_courses/course.rb', line 8

def initialize(opts = {})
  opts.each { |k, v| instance_variable_set("@#{k}", v) }
end

Instance Attribute Details

#code ⇒ Object (readonly)

Returns the value of attribute code.



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# File 'lib/lse_courses/course.rb', line 5

def code
  @code
end

#name ⇒ Object (readonly) Also known as: title

Returns the value of attribute name.



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# File 'lib/lse_courses/course.rb', line 5

def name
  @name
end

#type ⇒ Object (readonly)

Returns the value of attribute type.



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# File 'lib/lse_courses/course.rb', line 5

def type
  @type
end

#url ⇒ Object

Returns the value of attribute url.



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# File 'lib/lse_courses/course.rb', line 6

def url
  @url
end

Class Method Details

.all(options = {}) ⇒ Object 



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# File 'lib/lse_courses/course.rb', line 198

def self.all(options = {})
  defaults = { preload: false }
  options = defaults.merge(options)

  results = []

  course_lists.each_pair do |type, url|
    document = fetch_and_parse(url)
    document.css('table tr td p a').each do |link|
      abstract = link.text.split(" ")

      course_code = abstract.shift
      name = abstract.join(" ")
      course_url = URI.join(URI.parse(url), URI.parse(link['href'])).to_s

      results << self.new(
        url: course_url,
        name: name,
        code: course_code,
        type: type
      )
    end
  end

  results.each(&:fetch_attributes) if options[:preload]
  results
end

.course_lists ⇒ Object

Class methods



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# File 'lib/lse_courses/course.rb', line 190

def self.course_lists
  {
    "Undergraduate" => "http://www.lse.ac.uk/resources/calendar/courseGuides/undergraduate.htm",
    "Graduate" => "http://www.lse.ac.uk/resources/calendar/courseGuides/graduate.htm",
    "Research" => "http://www.lse.ac.uk/resources/calendar/courseGuides/research.htm"
  }
end

.fetch_and_parse(url) ⇒ Object 



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# File 'lib/lse_courses/course.rb', line 258

def self.fetch_and_parse(url)
  Nokogiri::HTML(open(url, &:read), 'UTF-8')
end

.find_by_code(code) ⇒ Object 



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# File 'lib/lse_courses/course.rb', line 226

def self.find_by_code(code)
  course_lists.each_pair do |type, url|
    document = fetch_and_parse(url)
    document.css('table tr td p a').each do |link|
      abstract = link.text.split(" ")

      course_code = abstract.shift
      name = abstract.join(" ")
      course_url = URI.join(URI.parse(url), URI.parse(link['href'])).to_s

      if code == course_code
        return self.new(
          url: course_url,
          name: name,
          code: course_code,
          type: type
        ).fetch_attributes
      end
    end
  end

  nil
end

.general_course_page ⇒ Object 



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# File 'lib/lse_courses/course.rb', line 254

def self.general_course_page
  @general_course_page ||= open("http://www.lse.ac.uk/resources/calendar/GeneralCourse/coursesNotAvailableToGeneralCStudents.htm").read
end

.join_p_tags(elements) ⇒ Object 



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# File 'lib/lse_courses/course.rb', line 250

def self.join_p_tags(elements)
  elements.map(&:text).join("\n").strip
end

Instance Method Details

#assessments ⇒ Object 



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# File 'lib/lse_courses/course.rb', line 84

def assessments
  if @assessments
    @assessments
  else
    fetch_attributes
    @assessments
  end
end

#availability ⇒ Object 



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# File 'lib/lse_courses/course.rb', line 102

def availability
  if @availability
    @availability
  else
    fetch_attributes
    @availability
  end
end

#average_class_size ⇒ Object 



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# File 'lib/lse_courses/course.rb', line 66

def average_class_size
  if @average_class_size
    @average_class_size
  else
    fetch_attributes
    @average_class_size
  end
end

#content ⇒ Object 



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# File 'lib/lse_courses/course.rb', line 120

def content
  if @content
    @content
  else
    fetch_attributes
    @content
  end
end

#department ⇒ Object 



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# File 'lib/lse_courses/course.rb', line 48

def department
  if @department
    @department
  else
    fetch_attributes
    @department
  end
end

#fetch_attributes ⇒ Object 



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# File 'lib/lse_courses/course.rb', line 12

def fetch_attributes
  page = self.class.fetch_and_parse(url)
  key_facts = page.css('#keyFacts-Content p')

  @survey = if page.css('#survey-Label').any?
    SurveyResult.new(
      response_rate: page.css('#survey-Label-2 span').text.gsub("Response rate: ", "").gsub("%", "").to_f,
      recommended_by: page.css('#survey-Content-Recommend p')[1].text.gsub("%", "").to_f,
      reading_list: page.css('#survey-Content table tbody td')[1].text.to_f,
      materials: page.css('#survey-Content table tbody td')[3].text.to_f,
      satisfied: page.css('#survey-Content table tbody td')[5].text.to_f,
      lectures: page.css('#survey-Content table tbody td')[7].text.to_f,
      integration: page.css('#survey-Content table tbody td')[9].text.to_f,
      contact: page.css('#survey-Content table tbody td')[11].text.to_f,
      feedback: page.css('#survey-Content table tbody td')[13].text.to_f,
    )
  end

  @code =  page.css('#courseCode').text
  @name = page.css('span#title').text
  @department = key_facts[0].text.gsub("Department: ", "")
  @students = key_facts[1].text.gsub("Total students 2012/13:", "").to_i
  @average_class_size = key_facts[2].text.gsub("Average class size 2012/13: ", "").to_i
  @value = key_facts[3].text.gsub("Value: ", "")
  @assessments = self.class.join_p_tags(page.css('#assessment-Content p'))
  @teachers = self.class.join_p_tags(page.css('#teacherResponsible-Content p'))
  @availability = self.class.join_p_tags(page.css('#availability-Content p'))
  @prerequisites = self.class.join_p_tags(page.css('#preRequisites-Content p'))
  @content = self.class.join_p_tags(page.css('#courseContent-Content p'))
  @teaching = self.class.join_p_tags(page.css('#teaching-Content p'))
  @formative_coursework = self.class.join_p_tags(page.css('#formativeCoursework-Content p'))
  @reading = self.class.join_p_tags(page.css('#indicativeReading-Content p'))

  self
end

#formative_coursework ⇒ Object 



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# File 'lib/lse_courses/course.rb', line 138

def formative_coursework
  if @formative_coursework
    @formative_coursework
  else
    fetch_attributes
    @formative_coursework
  end
end

#general_course? ⇒ Boolean Also known as: available_on_general_course?

Checks if this module is available to General Course students

Returns:

  • (Boolean) 


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# File 'lib/lse_courses/course.rb', line 178

def general_course?
  !self.class.general_course_page.include? code
end

#graduate? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/lse_courses/course.rb', line 169

def graduate?
  type == "Graduate"
end

#prerequisites ⇒ Object 



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# File 'lib/lse_courses/course.rb', line 111

def prerequisites
  if @prerequisites
    @prerequisites
  else
    fetch_attributes
    @prerequisites
  end
end

#reading ⇒ Object 



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# File 'lib/lse_courses/course.rb', line 147

def reading
  if @reading
    @reading
  else
    fetch_attributes
    @reading
  end
end

#research? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/lse_courses/course.rb', line 173

def research?
  type == "Research"
end

#students ⇒ Object 



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# File 'lib/lse_courses/course.rb', line 57

def students
  if @students
    @students
  else
    fetch_attributes
    @students
  end
end

#survey ⇒ Object 



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# File 'lib/lse_courses/course.rb', line 156

def survey
  if @survey
    @survey
  else
    fetch_attributes
    @survey
  end
end

#survey? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/lse_courses/course.rb', line 182

def survey?
  !!survey
end

#teachers ⇒ Object 



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# File 'lib/lse_courses/course.rb', line 93

def teachers
  if @teachers
    @teachers
  else
    fetch_attributes
    @teachers
  end
end

#teaching ⇒ Object 



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# File 'lib/lse_courses/course.rb', line 129

def teaching
  if @teaching
    @teaching
  else
    fetch_attributes
    @teaching
  end
end

#undergraduate? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/lse_courses/course.rb', line 165

def undergraduate?
  type == "Undergraduate"
end

#value ⇒ Object 



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# File 'lib/lse_courses/course.rb', line 75

def value
  if @value
    @value
  else
    fetch_attributes
    @value
  end
end