This is an approach I have used in the past: In app/models/tableless.rb class Tableless < ActiveRecord::Base def self.columns @columns ||= []; end def self.column(name, sql_type = nil, default = nil, null = true) columns << ActiveRecord::ConnectionAdapters::Column.new(name.to_s, default, sql_type.to_s, null) end # Override the save method to prevent exceptions. def save(validate = true) validate ? valid? … Read more
activerecord-import implements AR#import activerecord-import is a library for bulk inserting data using ActiveRecord. see how it works: books = [] 10.times do |i| books << Book.new(:name => “book #{i}”) end Book.import books Project’s home is on Github and it’s wiki.
No, you can’t do that, there’s no such thing as a polymorphic has_and_belongs_to_many association. What you can do is create a middle model. It would probably be something like this: class Subscription < ActiveRecord::Base belongs_to :attendee, :polymorphic => true belongs_to :event end class Event < ActiveRecord::Base has_many :subscriptions end class User < ActiveRecord::Base has_many :subscriptions, … Read more
Credits to http://moeffju.net/blog/using-bigint-columns-in-rails-migrations class CreateDemo < ActiveRecord::Migration def self.up create_table :demo, :id => false do |t| t.integer :id, :limit => 8 end end end See the option :id => false which disables the automatic creation of the id field The t.integer :id, :limit => 8 line will produce a 64 bit integer field
Rails supports Single Table Inheritance. From the AR docs: Active Record allows inheritance by storing the name of the class in a column that by default is named “type” (can be changed by overwriting Base.inheritance_column). This means that an inheritance looking like this: class Company < ActiveRecord::Base; end class Firm < Company; end class Client … Read more
This is because attributes/associations are actually methods(getters/setters) and not local variables. When you state “parent = value” Ruby assumes you want to assign the value to the local variable parent. Somewhere up the stack there’s a setter method “def parent=” and to call that you must use “self.parent = ” to tell ruby that you … Read more
In Rails 3.1 you can just class Form < ActiveRecord::Base serialize :column, JSON end
where(‘archived IS NOT NULL’, null, false)
Bah, found it here: https://stackoverflow.com/a/5570221/417872 City.includes(:photos).where(photos: { city_id: nil })
I think you can simply do this: @cust = Customer.new(params[:customer]) @cust.houses << House.find(params[:house_id]) Or when creating a new house for a customer: @cust = Customer.new(params[:customer]) @cust.houses.create(params[:house]) You can also add via ids: @cust.house_ids << House.find(params[:house_id])