I have a table called routes within my database where each route has an origin and destination. Given any origin, I want to be able to return a list of destinations that can be reached directly from this origin OR from any destination that links with this origin. How can I do this in Ruby?
def find_available_routes(origin)
routes = Array.new
#each row in routes has 'origin' and 'destination'
end
You mean essentially any destination that can be reached with at most one "layover"?
def find_available_routes(origin)
order_0_routes = Routes.where(:origin => origin)
destinations = order_0_routes.map(&:destination)
order_1_routes = Routes.where(:origin => [origin, *destinations])
end
This won't exactly be fast, but depending on the needs of your application, it should be acceptable. Caching would be a simple option.
I have a table called routes within my database where each route has an origin and destination. Given any origin, I want to be able to return a list of destinations that can be reached directly from this origin OR from any destination that links with this origin. How can I do this in Ruby?
def find_available_routes(origin)
#each row in routes has 'origin' and 'destination'
Routes.where(:origin => origin)
end
I suggest, you should go though this guides.rubyonrails - association_basics.
