This is a very cool lib, allows to define dynamic serialized fields in your AR model, which acts as normal rails db columns. It give you full power of rails to your virtual columns: validations, rails forms, error messages, type casting (integer, date/time), type safety, :dirty? s, etc.. STI is supported! Basic associations is working too!
Example of usage
STI table def
create_table :documents do |t| t.string :type t.text :serialized_attributes # <--- here all your dynamic fields will be saved t.integer :reference_id # <--- you can also define any sql columns for your indexes t.timestamps end
STI base model
class Document < ActiveRecord::Base include SerializedAttributes end
class Post < Document attribute :title, String attribute :body, String attribute :is_published, Boolean, :default => false attribute :comment_ids, Array # <--- serialized Array of ids of associated comments has_references_to :comments validates_presence_of :title, :body end class Comment < Document attribute :body, String, :requied => true # <--- validates_presence_of :body attribute :post_id, Integer belongs_to :post end
post = Post.create(:title => "First Post", :body => "Lorem ...") assert !post.new_record? post.comments = [Comment.create(:body => "this is a comment")] post.comments << Comment.create(:body => "this is second comment") assert_equal Comment.all.map(&:id), post.comment_ids post.save assert post.reload.comments.length == 2
- has-references-to association dont update reverse association;
- serialized-attributes column saved every time you call :save without depending on what is actually changed.