#!/usr/local/bin/ruby
class OReport
attr_accessor :id, :name
def initialize(id, name, desc)
@id = id
@name = name
@desc = desc
end
end
reports = Array.new
reports << OReport.new(1, 'One', 'One Desc')
reports << OReport.new(2, 'Two', 'Two Desc')
reports << OReport.new(3, 'Three', 'Three Desc')
How do I now search "Reports" for 2, so that I can extract name and description from it?
Use find to get an object from a collection given a condition:
reports.find { |report| report.id == 2 }
#=> => #<OReport:0x007fa32c9e85c8 @desc="Two Desc", @id=2, @name="Two">
If you expect more than one object to meet the condition, and want all of them instead of the first matching one, use select.
If the primary use for reports is to retrieve by id, then consider using a hash instead:
reports = {}
reports[1] = OReport.new(1, 'One', 'One Desc')
reports[2] = OReport.new(2, 'Two', 'Two Desc')
reports[3] = OReport.new(3, 'Three', 'Three Desc')
p reports[2].name # => "Two"
Hash lookup is usually faster than array lookup, but more important, it's simpler.
@id from OReport instance and use reports.key(report) when you need to refer an id, or is it better to leave it as in your answer?
You can get reports for 2 by the following syntax.
reports[1].name
reports[1].id
it will surely work for you.
