CODEWITHSUNDEEP
ruby-on-railsrubyhash
Andrew
Andrew

Reputation: 1126

Checking a hash for the existence of a matching value

I'm building a school calendar that lists classes ("sections") and displays semester and exam dates for those classes. The calendar is fed a hash that is defined in the Section.rb model:

  def get_calendar

    calendar = {}
    calendar[:semesters] = Semester.where(section_id: self.id)
    calendar[:exams] = Exam.where(section_id: self.id)

    { :calendar => calendar }

  end

The Semester and Exam objects have a name, start_date and end_date.

When looping through each day of the calendar, how can I check if there's a semester or exam with a start_date or end_date for that day of the loop?

If there is a semester or exam with either a start_date or end_date that matches the calendar date, I would to display the name.

The calendar dates and the start_date and end_date fields all use the Date class (link).

I sincerely appreciate the help. I can clarify the question if needed :)

Thank you!

Upvotes: 1

Views: 156

Answers (2)

bhattamer
bhattamer

Reputation: 121

Would the enumberable detect method work? http://ruby-doc.org/core-1.9.3/Enumerable.html#method-i-detect

So as your looping through your condition could be...

semesters.detect{|s| s.begin_date > cal_begin_date ... //more conditions here} && 
exams.detect{|e| e.begin_date > cal_begin_date ... //more conditions here}

Upvotes: 1

MrYoshiji
MrYoshiji

Reputation: 54882

Maybe you should re-think your hash, and use it this way:

def get_calendar
  semesters = self.semesters
  exams = self.exams

  events = { }

  (semesters + exams).each do |event|
    start_date = event.start_date.to_s
    events[start_date] ||= []
    events[start_date] << event

    end_date = event.end_date.to_s
    events[end_date] ||= []
    events[end_date] << event
  end

  events
end

And test the presence of an event in the loop that constructs the Calendar:

dates_of_calendar.each do |date|
  if @events[date.to_s].present?
    # well, there is an event happening for this date! treat it as your wishes!
  end
  # etc...
end

Upvotes: 1

Related Questions