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
···
--
Posted via http://www.ruby-forum.com/.
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.
···
--
Posted via http://www.ruby-forum.com/.
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
···
On 04.05.2009 23:39, Nick da G wrote:
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
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
···
--
Posted via http://www.ruby-forum.com/.
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
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.
···
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