I've been using plain Ruby form objects in rails, but to keep my code organized, I've ended up having to add a ton of namespaces to them. So I'll have a form like: class User::Registration::NewFor...

I've got three models. Sales, items, and images. I'd like to validate that when a sale is created there are at least three photos per sale and one or more items. What would be the best way to achie...

I have the following code, which works fine with no errors but the models never get saved... myarray.each do |item| r = MyModel.unscoped.where(:site_id => @site.id, :url => item['permalink...

I have some problems with one of gem supporting ActiveModel caching. When I'm using observer for cached model, during application initialization it tries to describe table to get all fields names. ...

In Bryan Helmkamp's excellent blog post called "7 Patterns to Refactor Fat ActiveRecord Models", he mentions using Form Objects to abstract away multi-layer forms and stop using accepts_nested_attr...

In my Rails 3.2.11 and "development" environment when I try to have an active model: class DisponibilityApi include ActiveModel::Model attr_accessor :start_time, :end_time validates :start_ti...

When using autocomplete in the console, I often see "_was" postpended to my attributes. But I can't find any documentation or best practices for usage. What does it do and how should it be used? E...

I have a callback of a model that needs to create a dependent object based on another field entered in the form. But params is undefined in the callback method. Is there another way to access it? W...

I have a very generic validator and I want to pass it arguments. Here is an example model: class User include Mongoid::Document field :order_type has_many :orders, inverse_of :user validate...

Using the ActiveAttr: class Filter include ActiveAttr::Model attribute term # Overriding to_key, to_param, model_name, param_key etc doesn't help :( end class SpecialFilter < Filter end H...

Summary: I'm trying to alter an attribute's value within a custom ActiveModel::EachValidator validator. Given the following prototype: def validate_each(record, attribute, value) trying to set va...

As a preface to this question: I am brand new to Rails development (and web-development in general), and some of my concerns may be unfounded, so any feedback would be very helpful. I am attemptin...

I have some troubles with rails 3.2.0 & ruby 1.9.3, I only created a new app with rails new command and I'm trying to deploy to heroku. I'm having the following app error: An error occurred in ...

Should I extend or include ActiveModel:Validations:Callbacks:ClassMethods or ActiveModel:Validations:Callbacks?

I am trying to get ActiveModel::Callbacks to work with ActiveResource (specifically after_initialize) for a Rails 3 app, but I can't seem to get it to work. I don't get any errors, but the callback...

I want to ensure users can't create usernames that clash with my existing routes. I would also like the ability to deny future routes I may define. I am thinking of accomplishing this like so: In ...

I am wondering how to do the association in Rails correct. First I create a City model and an Organisation. Now I want to have an Organisation have a City... this is done by adding the has_many and...

I would like to have a Dashboard to display summary of multiple models, and I implemented it using Presenter without its own data. I use an ActiveModel class (without data table): class Dashboard ...

With a regular ActiveRecord/SQL setup in Rails, in console when I execute commands *.where, *.all etc., I get back the actual array of record items. However, after switching to Mongoid, I instead g...

I use Rails 3.0.4 and RSpec 2.5. In my controllers I use named scopes heavily, for example @collection = GuestbookEntry.nonreplies.bydate.inclusive.paginate( :page => params[:page], :conditions...

I try to follow http://api.rubyonrails.org/classes/ActiveModel/Validator.html , but where should I put the class MyValidator < ActiveModel::Validator def validate(record) if some_complex_lo...

Where are the default validation error messages in Rails 3.0? What is the equivalent of ActiveRecord::Error.default_error_messages[:taken], for example? I have gotten as far as finding that ActiveM...