ruby on rails - Checking a hash for the existence of a matching value -

i'm building school calendar lists classes ("sections") , displays semester , exam dates classes. calendar fed hash defined in 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 , exam objects have name, start_date , end_date.

when looping through each day of calendar, how can check if there's semester or exam a start_date or end_date for day of loop?

if there semester or exam either start_date or end_date matches calendar date, display name.

the calendar dates , start_date , end_date fields use date class (link).

i sincerely appreciate help. can clarify question if needed :)

thank you!

maybe should re-think hash, , use way:

def get_calendar   semesters = self.semesters   exams = self.exams    events = { }    (semesters + exams).each |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 presence of event in loop constructs calendar:

dates_of_calendar.each |date|   if @events[date.to_s].present?     # well, there event happening date! treat wishes!   end   # etc... end