I have 3 models, class Host ref: string address: string, name: string primary_key='ref' has_many :rooms, :class_name=>"Room", :foreign_key=>'host_ref' Class Room ref :string host_ref: string capacity: integer primary_key='ref' has_many :bookings, :class_name=>"Booking", :foreign_key=>'room_ref' belongs_to :host Class Booking ref: string room_ref :string start_date: date end_date: string number_of_guests :integer primary_key='ref' belongs_to :room Here one should be able to see the vacancies against each host. A person when he enters the start date, end date and number of persons to book for a room, he must get the list of hosts who have rooms vacant and number of vacancies. How can I write the query in rails? for example: Suppose the records are Host ref name address host#1 Mr Allan 23, Camden Street host#2 Mr Tom 12, nassau Street host#3 Mr anice 34, Philip street Room ref host_ref capacity room#1 host#1 3 room#2 host#2 1 room#3 host#2 4 room#4 host#3 2 room#5 host#3 1 room#6 host#3 2 room#7 host#3 3 Booking ref room_ref start_date end_date no_of_guests b#1 room#1 10-02-2013 20-02-2013 2 b#2 room#2 05-02-2013 15-02-2013 1 b#3 room#1 01-02-2013 13-02-2013 1 b#4 room#3 15-02-2013 28-02-2013 1 b#5 room#5 10-03-2013 15-03-2013 1 b#6 room#7 15-02-2013 25-02-2013 1 I want to search for the number of vacancies against each host. suppose I want to search as start date: 15-02-2013 end date:18-02-2013 number of persons:2 I must get the result as: host#2 Mr Tom 12, nassau Street room#3 1 booked 3 free 4 total host#3 Mr anice 34, Philip street room#4 0 booked 2 free 2 total room#6 0 booked 2 free 2 total room#7 1 booked 2 free 3 total Example 2: If I want to search as start date: 01-02-2013 end date 13-02-2013 no of persons:1 I must get the result as host#1 Mr Allan 23, Camden Street room#1 2 booked 1 free 3 total host#2 Mr Tom 12, nassau Street room#2 0 booked 1 free 1 total host#3 room#4 0 booked 2 free 2 total room#5 0 booked 1 free 1 total room#6 0 booked 2 free 2 total room#7 1 booked 2 free 3 total How can I achieve this result in rails? Can I get the query for this or loop?
on 2013-02-26 14:25
on 2013-02-28 13:56
Hey, Test this code. Call Host.available(start_date,end_date) hope it will help you.
on 2013-02-28 15:48
Pardeep Dhingra wrote in post #1099533: > Hey, > Test this code. > Call > > Host.available(start_date,end_date) > > hope it will help you. But we search with number of persons.
on 2013-02-28 16:16
On 26 February 2013 11:47, Sajeev Zacharias <email@example.com> wrote: > ref :string > host_ref: string > capacity: integer > primary_key='ref' > has_many :bookings, :class_name=>"Booking", > :foreign_key=>'room_ref' > belongs_to :host You will need a foreign_key spec on the above. > > Class Booking > ref: string > room_ref :string > start_date: date > end_date: string Why is end_date a string? > number_of_guests :integer > primary_key='ref' > belongs_to :room You will need a foreign_key spec here also. Unless you are connecting to a legacy database that you /definitely/ cannot change then do not use unusual names for the keys, and do not use string types. With Rails your life will be much simpler if you stick to the Rails conventions. > > Here one should be able to see the vacancies against each host. > A person when he enters the start date, end date and number of persons to > book for a room, he must get the list of hosts who have rooms vacant and > number of vacancies. How can I write the query in rails? If you cannot see how to write the complete query then, for a start, just do what you can in the query and do the rest in code. Make sure that your automated tests check out the results and the tests pass. Then, if necessary, you can refactor the code and queries to make it more efficient, secure in the knowledge that your tests will show that it is correct. If you cannot even see how to make a start then the first thing is to write the requirement in pseudo code (something like find hosts where ..and ..). Once you can write that down clearly and unambiguously then you should be well on the way towards the solution. Colin
on 2013-02-28 17:41
So you can modified that given method with no of persons...