Hello, All. I'm trying to consuming an xml file and map it to a Ruby object that would describe that xml file. What would be the best way to implement the following scenario. Let's say I have several classes: Student, Course, Person, Tuition Xml for this would look like this: <Record> <Student status="good"> <Person> <Name>Alice</Name> <BirthPlace>WonderLand</BirthPlace> </Person> <Course difficulty="> <CourseName>Math III</CourseName> <Grade>B+</Grade> </Course> <dt:Tuition> <dt:Currency>USD</dt:Currency> <dt:Amount>500</dt:Amount> <dt:Period>3 months</dt:Period> </dt:Tuition> </Student> </Record> So basically I can parse the xml file using rexml and access all of my xml tags and stuff. Here is the Object I want to map it to: class Student @status @person - access Person end class Person end class Course end class Tution end So the question is how do I access from class Student - class Person? So that when I down the line later when I parse the file and do: r = Record.new I want to be able to do things like: r.student.person.name ???? Thank you
on 2009-05-04 23:39
on 2009-05-04 23:42
Also to clarify xml tag like <Course> can be repeated in my xml file, so: r.student.course could return an array of objects of class Course.
on 2009-05-05 00:05
To clarify Futhre I'm doing somethign like this right now: class Base attr_accessor :name, :value def initialize @name @value end end class Student attr_accessor :person, :tuition def initialize @person = Person.new @tuition = Tuition.new end end ... define Tuition & Person class. I'm just looking for a better way to do it. Also how would I properly define :course within Student, considering that I might have a single Course or multiple - depending on the record. Thank you
on 2009-05-05 00:08
> Also to clarify xml tag like <Course> can be repeated in my xml file, > so: > > r.student.course > could return an array of objects of class Course. > -- > Hi Nick, There are some good libraries to accomplish this. You may want to have a look at one of these (ordered by my own preferences): xml-object: http://github.com/jordi/xml-object/tree/master happy-mapper: http://happymapper.rubyforge.org/ xml-mapping: http://xml-mapping.rubyforge.org/ Hope it helps Cheers
on 2009-05-05 00:40
Thank you Alex, but no go :-( I looked into all of them - they all lack in some respect: happy-mapper - can't build xml & handle namespaces xml-object can't handle namespaces - and some other issue - can't remember xml-mapping - same thing roxml - same problem. So the solution is to just do it myself. However that wasn't my question - it was more a of generic ruby class question.
on 2009-05-05 08:33
On 04.05.2009 23:39, Nick da G wrote: > <Student status="good"> > <dt:Amount>500</dt:Amount> > class Student > class Tution > r.student.person.name You can define attributes via attr_accessor, e.g. class Student attr_accessor :person end class Person attr_accessor :name end st = Student.new pe = Person.new pe.name = "Nick" st.person = pe etc. As a shortcut you can as well use Struct: Student = Struct.new :person Person = Struct.new :name Kind regards robert