similar to: define_method vs module_eval

Rails extends Ruby with mattr_accessor (Module accessor). As Ruby''s attr_accessor generates getter/setter methods for instances, mattr_accessor provide getter/setter methods at the module level. In below example, you see that mattr_accessor declared in the class context of LookupContext. It''s declared in class, not module. However, modules are defined in LookupContext, for

When trying to understand a piece of code from the Ruby-On-Rails framework, I found that I''m still lacking knowledge about scope issues in Ruby. Here is a stripped down version of the code I''m trying to understand (in case you happen to use Rails: This is from file scaffolding.rb): module ActionController module Scaffolding .. module ClassMethods def

Hi, I''m trying to write a macro which defines methods. One of these should have a parameter, but I can''t get that to work. Something like: define_method("printstuff") do puts "blabla" end works fine. But, how do I use define_method to create something like: def printstuff(the_stuff) puts the_stuff end Thanks in advance.

class A def initialize setup_b setup_c end def b_and_c "#{@b} and #{@c}" end private def setup_b @b = ''b'' end def setup_c @c = ''c'' end def setup_d @d = ''d'' end end a = A.new a.instance_variable_get("@b") # => "b" a.instance_variable_get("@c") # =>

Yehuda has a nice article on implementing a custom renderer for PDF at http://www.engineyard.com/blog/2010/render-options-in-rails-3/ I''ve tried to follow the example and I''m not sure I see how to get it to work. If I understand things correctly, the format(s) usable in this render call respond_with(@resource) do |format| format.xyz { render :xyz => ... } end

>> reload! Reloading... => true >> puts Class < Module true => nil >> puts Module < Class false => nil >> puts Module < Object true => nil >> puts Object < Module false => nil >> Object.parent => Object The above indicates that the Class object instance inherits from the Module object instance and the Module object instance

How do you evaluate text as code in Ruby? I''m sure there''s a technical term for this... Thanks Chris -- Posted via http://www.ruby-forum.com/.

Say the user first enters "ruby" for search and gets 1000 results. Then he can search "rails" just in the 1000 results just returned. The common scenario is some kind of advanced search. User can incrementally add criteria and the program will narrow the results step by step. I know that at least I can use all the criteria as a whole to do the searching, but this is a waste

I was looking at my controller code and the edit/create/update/new for each are practically identical. So first I DRY''d the four methods in each controller to just one and then I decided to write a single macro for all my controllers. This is the macro: def self.edit_action_for(model, options = {}) model_class = Object.const_get(model) define_method(:edit) do

Hello, I needed to add custom cache field for one of my application. I thought I will share the code showing how to do this. This code below creates and maintain a custom cache field, for keeping track of totals. Say, you have accounts, and for each account there are transactions (either deposit/withdrawal), and one will like to keep track of the total balance for an account. So, let there be a

This introduces support to run P2V without X server. Runtime parameters are specified via kernel command line making it hopefully suitable for automated migration with a little help of PXE boot. Patchset is not squashed and represents dev. history.

I have a an STI table which acts_as_tree, that has a large number of classes/types. My common fields are: id parent_id name description with 4 more text fields, I could cover most of my classes if I could redefine the name of the field like this. text1 AS address1 text2 AS address2 text3 AS zipcode For one class and text 1 AS model_number text2 AS vendor Is there a construct that will allow

Hello,I get this message and I don''t know how to interprete this.I think it has to do with plural tables and singular referencesThanks for any help!Jim======================================================================================uninitialized constant SubjectRAILS_ROOT: ./script/../config/.. Application Trace | Framework Trace | Full Trace

Hi All, I have a problem with the stemming(?) in rails. I have a table cookie and a Cookie model which I have generated a scaffold for. The problem is that rails starts looking for a file that it calls "cooky.rb", this must be some kind of misunderstanding between me and rails, but how do I correct it? Other scaffolds work just fine. /Hugo NameError in Cookie#index uninitialized

Hi.. Im a brand new ruby on rails developer, and when i make a scaffold and navigate to the it, i get an error that looks like this. ----------------------------------------------------------------- NameError in PagesController#list uninitialized constant Page RAILS_ROOT: ./script/../config/.. Application Trace | Framework Trace | Full Trace

Hi all, So far as I know, while using acts_as_ferret, we should add the following declaration in the ActiveRecord model which is going to be indexed: acts_as_ferret({:fields => @@ferrect_fields}) in which @@ferrect_fields is a hash containing all the field to be indexed. This is pretty much for some simple situations. But I got a more complex situation that I want to define the fields to be

Hi All, Yesterday wrote about my troubles with naming a table and model cookies and cookie respectively. I know that everybody hates the newbie screaming bug as soon as he encounters behaviour he doesn''t understand. But I''ve reproduced the error in the simplest application possible, and dare therefore say that this quite possible could be a bug in Rails. Database: CREATE TABLE

Hello, I''m writting some helper methods to write forms, so I have this working code: class TableFormBuilder < ActionView::Helpers::FormBuilder ["file_field", "password_field", "text_field"].each do |name| define_method(name) do |label, *args| @template.content_tag(:tr, @template.content_tag(:td, @template.content_tag(:label,

Hi All, I am new to Ruby and ROR I were trying to create small DSL for conditional validations valid_with_cond :bypass_validation do if self.addresses > 3 errors[:base] << "Can not have more than 3 addresses". end end By this I wanted to create array of method and call them all in custom validation method. this above code I wanted to do attr_accessor

I am attempting to get a working Rails programming environment setup working under XP with MySQL, RadRails and Webrick. I have been using my PowerBook but need to working on Windows environment too. I have basic functions of Ruby and Rails going. I created a really simple table and generated the scaffolding. The server starts just fine. I can browse the database succesfully in RadRails. The issue