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comp.lang.ruby

Add dynamic instance methods in a controller class

Luc Juggery

11/4/2006 3:04:00 PM

Hello All,

I have a problem while developping an application using rails.
In fact, this is more a general question on Ruby methods.
I'd like to add some methods to my controller depending upon some
parameters read from an xml file during initialisation (I hope I am
quite clear :-) )
Below is the code I am using:

----------------
require 'rexml/Document'
include REXML

class MyController < ApplicationController

def index
# Xsd is a model (not ActiveRecord that is used to get
values from an XML file
xsd = Xsd.new("myfile.xsd")

# Get main section
@main_sections = xsd.get_main_sections

# Get item for first section
@item = xsd.get_items_per_section(@main_sections[0].to_s)

# Dynamically create method for to retrieve list of fields for each
main sections
# THIS PART IS NOT WORKING
@main_sections.each do |section|
self.instance_eval{ define_method("get_item_for_#{section}") {"toto"}}
end
end
end
-----------------


While testing this, I have an error message saying that the
define_method does not exist !!!!
Why is this method not found ???
I am still not sure about the instance_eval, class_eval, define_method
I need to use.
Do you have any clues regarding this problem ?

Thanks a lot,

Luc
3 Answers

Gavin Kistner

11/4/2006 3:24:00 PM

0

Luc Juggery wrote:
> I have a problem while developping an application using rails.
[snip]

You might have better luck asking this question on the Rails group:
http://groups.google.com/group/rubyon...

Gabriele Marrone

11/4/2006 3:45:00 PM

0


Il giorno 04/nov/06, alle ore 16:03, Luc Juggery ha scritto:

> # THIS PART IS NOT WORKING
> @main_sections.each do |section|
> self.instance_eval{ define_method("get_item_for_#{section}")
> {"toto"}}
> end

I suggest something like:

@main_sections.each do |section|
eval %Q(
def get_item_for_#{section}
"toto"
end
)
end

I didn't try it but I think it should work.

Luc Juggery

11/4/2006 11:38:00 PM

0

Thanks a lot, I have post it in rubyonrails-talk.
Sorry for this but I though this was more linked to ruby than to rails.
Luc