activemodel

I have a Rails 3.0.9 app that, once it is deployed, suffers from a bunch of ActiveModel::MissingAttributeErrors that crop up causing 500s. The errors occur fairly randomly, sometimes a page will load, other times it won't, but the attributes are all existing attributes in the database and should be found. The strange part is that after a while, the errors go away. Suddenly, they stop causing an issue. I have searched about for a solution to this, but this error mostly occurs either when someone has done Model.all(:select => 'column_x,column_y') and are calling for column_z or when they are

How cat I get list of validations defined in model Example: class ModelName validates_presence_of :field_name validates_inclusion_of :sex, :in => %w(M F) end I need Hash like: {:field_name => 'required', :sex => 'Must be in: M, F'} You don't need a plugin for basic needs. You can do this to get a hash of all validators. ModelName.validators If you want to get the validators for a specific field : ModelName.validators_on(:attribute) This code yields an array of required fields. It should be adaptable to your needs. @required_fields = [] ModelName.validators.each do |v| @required_fields << v

The #new_record? function determines if a record has been saved. But it is always false in the after_save hook. Is there a way to determine whether the record is a newly created record or an old one from update? I'm hoping not to use another callback such as before_create to set a flag in the model or require another query into the db. Any advice is appreciated. Edit: Need to determine it in after_save hook, and for my particular use case, there is no updated_at or updated_on timestamp I was looking to use this for an after_save callback. A simpler solution is to use id_changed? (since it won

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 attr_accessor :user_id def initialize(id) self.user_id = id end delegate :username, :password, :to => :user delegate :address, :to => :account delegate :friends, :to => :friendship end By delegate, I want to be able to call Dashboard.address and get back Account.find_by_user_id(Dashboard.user_id).address . If Dashboard was an ActiveRecord class, then I could have declared Dashboard#belongs_to :account

I've configured my database.yml to point to my existing mysql database how can I generate models from it? rails generate model existing_table_name only gives an emty model.. A Rails model doesn't show your fields, but you can still use them. Try the following. Assuming you have a Model named ModelName and a field called "name", fire up the Rails console and type: ModelName.find_by_name('foo') Given a name that exists in the DB, you should see results. Rails doesn't infer relationships though, but if your database follows Rails conventions they are easily added. Update I've noticed this

I have the following validator: # Source: http://guides.rubyonrails.org/active_record_validations_callbacks.html#custom-validators # app/validators/email_validator.rb class EmailValidator < ActiveModel::EachValidator def validate_each(object, attribute, value) unless value =~ /^([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})$/i object.errors[attribute] << (options[:message] || "is not formatted properly") end end end I would like to be able to test this in RSpec inside of my lib directory. The problem so far is I am not sure how to initialize an EachValidator . Here's a quick spec I knocked up for that