I have a query where I need to modify the selected data and I want to limit my results of that data. For instance: SELECT table_id, radians( 25 ) AS rad FROM test_table WHERE rad < 5 ORDER BY rad ...

I have model represent association rule (Body => Head) def Item has_many :heads has_many :bodies ... end def Rule has_many :heads has_many :bodies ... end def Body belongs_to :item belongs_to :rule ...

Today we had a lot more activity than normal between our Ruby on Rails application and our remote legacy SQL Server 2005 database, and we started getting the error below intermittently. What is is? ...

I am trying to run an active record migration but am receiving the following error: undefined method info for nil:NilClass Here is the 2 lines of code in my rake task that runs the migration ...

While playing around with one-to-one associations in castle activerecord I stumbled upon the following problem: I m trying to model a one-to-one relationship (user-userprofile in this case). I ...

I have an Event model, which stores an event feed for each user. I also need to email the updates to users which have enabled email notifications in their profile. From an architectural point of view,...

I have a these 3 models: class User < ActiveRecord::Base has_many :permissions, :dependent => :destroy has_many :roles, :through => :permissions end class Permission < ActiveRecord::...

How to do that with ActiveRecord? My code: p = Product.create l = Label.create p.labels.add << l But I get l.parent == nil create_table "labels", :force => true do |t| t.integer "...