Gracias, Yeggeps, por la lista de requisitos.
Esta es una respuesta revisada basada en sus requisitos. Por supuesto, no hay un santo grial para los esquemas, pero me gustaría motivar mi respuesta antes de la revisión (mantener una estructura plana es fácil de consultar y mantener) con algunos datos de muestra + consultas basadas en su lista de requisitos. Reitero, no digo que esta sea la mejor solución, pero es a solución que es fácil de consultar y fácil de mantener (en mi humilde opinión).
El código es un poco rápido y sucio, disculpas. Los datos:
[
# library "lib1" open on wednesdays from 8:00 until 17:00
{"lib_id" => "lib1", "type" => "hours", "opening" => 800, "closing" => 1700, "day_of_week" => 3},
# library "lib1" open on wednesdays from 19:00 until 22:15
{"lib_id" => "lib1", "type" => "hours", "opening" => 1900, "closing" => 2215, "day_of_week" => 3},
{"lib_id" => "lib1", "type" => "hours", "opening" => 800, "closing" => 1700, "day_of_week" => 4},
{"lib_id" => "lib2", "type" => "hours", "opening" => 1100, "closing" => 1700, "day_of_week" => 3},
{"lib_id" => "lib2", "type" => "hours", "opening" => 1400, "closing" => 1700, "day_of_week" => 4},
{"lib_id" => "lib2", "type" => "hours", "opening" => 1900, "closing" => 2100, "day_of_week" => 4},
# library lib1 closed on wednesday december 7th 2011
{"lib_id" => "lib1", "type" => "closed_on", "reason" => "Rearranging the shelves", "closed_date" => Time.utc(2011, 12, 8)},
{"lib_id" => "lib2", "type" => "closed_on", "reason" => "We are closed for the holidays", "closed_date" => Time.utc(2011, 12, 7)}
].each do |schedule|
coll.save(schedule)
end
Mostrar horarios de apertura y fechas excepcionales por separado:
# List all the library id's distinctly
coll.distinct("lib_id").each do |lib_id|
puts "\nLibrary #{lib_id} opening hours:\n--- "
# I need to be able to show the opening hours in correlation with the Library
# Find all the opening hour information for current library
coll.find({"lib_id" => lib_id, "type" => "hours"}).each do |schedule|
puts " #{Date::DAYNAMES[schedule["day_of_week"]]}s: #{schedule["opening"]} - #{schedule["closing"]}" if schedule["type"] == "hours"
end
# I need to show an indication if it's open or closed in correlation with the Library.
puts "This library will be closed on: "
# Find all the exceptions for current lib_id -- introduce a time-period restriction using Date.utc (...)
coll.find({"lib_id" => lib_id, "type" => "closed_on"}).each do |closed|
puts " #{closed["closed_date"].strftime("%a %B%e, %Y")}: #{closed["reason"]}"
end
end
¿Qué bibliotecas están abiertas hoy?
# I need to be able to query on what's open right now or some time in the future with minute granularity
# here I'll also need to be able to exclude the Librarys that has added exceptions for the given time/day
puts "---"
qtime = (Time.now.hour * 100) + Time.now.min # minute granularity
qwday = Time.now.wday # this example only shows today
qclosed = Time.utc(Time.now.year, Time.now.mon, Time.now.mday)
# Query for all library ids which have opening times for this weekday, at this hour (+minutes)
coll.find({"opening" => {"$lte" => qtime}, "closing" => {"$gte" => qtime}, "day_of_week" => qwday}, {:fields => "lib_id"}).each do |lib|
# Check whether current library has an exception for this specific day
closed = coll.find_one({"lib_id" => lib["lib_id"], "closed_date" => qclosed})
if closed
# If an exception record was encountered, print the reason
puts "Library #{lib["lib_id"]} is normally open right now, but is now closed: '#{closed["reason"]}'"
else
# Else: the library is open
puts "Library #{lib["lib_id"]} is open right now! (#{Time.now.strftime("%a %B%e %Y, %H:%M")})"
end
end
Produce la salida de la siguiente manera:
Library lib1 opening hours:
---
Wednesdays: 800 - 1700
Wednesdays: 1900 - 2215
Thursdays: 800 - 1700
This library will be closed on:
Thu December 8, 2011: Rearranging the shelves
Library lib2 opening hours:
---
Wednesdays: 1100 - 1700
Thursdays: 1400 - 1700
Thursdays: 1900 - 2100
This library will be closed on:
Wed December 7, 2011: We are closed for the holidays
---
Library lib1 is open right now! (Wed December 7 2011, 13:12)
Library lib2 is normally open right now, but is now closed: 'We are closed for the holidays'
Es cierto que la desventaja de mi solución propuesta es que no captura todos los requisitos en one consulta.
