Plugin: create instance methods dynamically in ClassMethods?

Rails
1

Hi all

I have the following plugin code:

module IncenseCrud
def self.included(base_class)
base_class.extend(ClassMethods)
end

module ClassMethods
def performs_incense_crud
def index
list
return render(:action => ‘list’)
end
end
end
end

In init.rb I have the following:

require File.dirname(FILE) + ‘/lib/incense_crud’
ActionController::Base.send(:include, IncenseCrud)

So far so good. In any controller I can put now

class AnyController < ApplicationController
performs_incense_crud
end

and the performs_incense_crud method is invoked. Cool - the class method
has been added to the controller through the plugin.
But strangely the instance method index does not seem to have been
added! It’s just disappeared when trying to reach

www.xxx.yyy/any_controller/index

What’s wrong here? Can’t I add these methods dynamically this way?

Thanks
Josh

2

define_method usually does the trick when trying to define methods
dynamically :slight_smile:

Fred

3

Frederick C. wrote:

define_method usually does the trick when trying to define methods
dynamically :slight_smile:

Fred

Thank you, this works well.

Now I’ve got another question…

In fact, my method performs_incense_crud accepts an option parameter:

def performs_incense_crud(options = {}) … end

Now I’d like to use this options parameter in another method called
list:

module IncenseCrud
def self.included(base_class)
base_class.extend(ClassMethods)
end

module ClassMethods
def performs_incense_crud(options = {})
define_method(:index) do
list
return render(:action => ‘list’)
end

  define_method(:list) do
    @pages, @objects = paginate :sessions, :per_page =>

(options[:items_per_page] || 10)
end
end
end
end

When using…

performs_incense_crud :items_per_page => 5

…it works great. But when omitting this option…

performs_incense_crud

…it returns the following error:

NameError in XxxController#index
undefined local variable or method ` 10’ for
#LinksController:0x32a896c

The same happens when using ? : …

:per_page => (options[:items_per_page] ? options[:items_per_page] : 10)

instead of ||.

Can anybody tell why this doesn’t work here? Thanks a lot,
Josh