dipth/heritage

A gem for using Multiple Table Inheritance with rails 3

heritage's Issues

Question: heritage and ActiveRecord associations

Hi,

Thanks for the great gem.

I couldn't figure out how to implement associations when the type of the heir is unknown.
Example: I want to do something like:

class Post < ActiveRecord::Base
  acts_as_predecessor
  belongs_to :site
end

class BlogPost < ActiveRecord::Base
  acts_as_heir_of :post
end

class ImagePost < ActiveRecord::Base
  acts_as_heir_of :post
end

class Site < ActiveRecord::Base
  has_many :posts #could be BlogPost or ImagePost 

  def create_some_posts
      post1 = BlogPost.create
      posts << post1
      post2 = ImagePost.create
      posts << post2
  end
end

How should I fix this code? Please advise. Thanks!

Error in acts_as_heir.rb

NameError: uninitialized constant Heritage::ActiveRecord::ActsAsHeir::Post

Question: Predecessor destruction on heir.destroy

Hi,
and thank for your gem. I've 2 classes : Media (predecessor) and Image(heir). I'm trying to destroy a media's instance (destroy) through the Image.destroy method.
Actually, the "predecessor" class is destroyed by "heir".destroy but the reciprocal isn't working.

Could you indicate me how could I fix this issue ?

Thx

Error using acts_as_heir_of when use underscore '_' in a model filename

Hi,

When i try use your software to inherit my im_image table from im_file model, i received the following error

Expected /Users/hsobral/sistemas/imager/app/models/im_file.rb to define Im_file

I founded this two lines using capitalize. I think the right would be to use the camelize

self._predecessor_klass = Object.const_get(predecessor_symbol.to_s.capitalize)
...
has_one :predecessor, :as => :heir, :class_name => predecessor_symbol.to_s.camelize, :autosave => true, :dependent => :destroy

Thanks.
Henrique

Stack Level too deep with 'Resque'

Hello,

First, thank you for this tool which is very easy to use.

I met a problem with 'Resque' and 'Heritage' -> https://github.com/defunkt/resque

I have a class SoapMonitor which inherites Monitor.

require 'snmp'

class SoapMonitor < ActiveRecord::Base

        attr_accessible :name, :description, :host, :port, :wsdl_filename

        acts_as_heir_of :monitor

        validates_presence_of :name, :host
end

A class with a perform method ( Job that worker have to execute)

require 'resque'
require 'soapmonitor'

class Update_SoapMonitor

@queue = :SoapMonitor_queue


        def self.perform(webio_id)
                ActiveRecord::Base.verify_active_connections!
                soapm = SoapMonitor.find(webio_id)
                puts soapm.wsdl_filename #This is OK (Attribute from SoapMonitor)
                puts soapm.host #This is not OK (Attribute from Monitor)
        end

end

soapm.host returns me :

Class
    Update_SoapMonitor
Arguments
    "1"

Exception
    SystemStackError
Error
    stack level too deep

    /usr/lib/ruby/gems/1.8/gems/heritage-0.3.1/lib/heritage/active_record/acts_as_heir.rb:57:in `predecessor_without_build'
    /usr/lib/ruby/gems/1.8/gems/heritage-0.3.1/lib/heritage/active_record/acts_as_heir.rb:58:in `predecessor'
    /usr/lib/ruby/gems/1.8/gems/heritage-0.3.1/lib/heritage/active_record/acts_as_heir.rb:20:in `host'
    /usr/lib/ruby/gems/1.8/gems/savon-0.9.9/lib/savon/client.rb:165:in `send'
    /usr/lib/ruby/gems/1.8/gems/savon-0.9.9/lib/savon/client.rb:165:in `method_missing'
    /var/www/html/MyApp/app/models/soapMonitor.rb:32:in `create_soap_client'
    /usr/lib/ruby/gems/1.8/gems/savon-0.9.9/lib/savon/client.rb:159:in `instance_eval'
    /usr/lib/ruby/gems/1.8/gems/savon-0.9.9/lib/savon/client.rb:159:in `evaluate'
    /usr/lib/ruby/gems/1.8/gems/savon-0.9.9/lib/savon/client.rb:147:in `process'
    /usr/lib/ruby/gems/1.8/gems/savon-0.9.9/lib/savon/client.rb:34:in `initialize'
    /var/www/html/MyApp/app/models/soapMonitor.rb:31:in `new'
    /var/www/html/MyApp/app/models/soapMonitor.rb:31:in `create_soap_client'
    /var/www/html/MyApp/app/models/soapMonitor.rb:80:in `get_value'
    /var/www/html/MyApp/app/models/soapMonitor.rb:41:in `version'
    /var/www/html/MyApp/app/workers/Update_SoapMonitor.rb:28:in `perform'

Do you have any suggestions to help me ?

Bests Regards,

Heirs not respecting predecessor validation?

I'm able to create child objects without satisfying the validation on the parent object.

When I try to create the parent object directly without the required field, I get the validation error like I'm supposed to. However, no complaints when I create the child object without the required parent field set.

Cyclic update

It's a perfomance issue.
It sends cyclic update request on model update,
I have Product model as a predecessor and Movie as a heir.
When I update movie it sends 4 request to DB instead of 2.
Here is a simple example to reproduce:

mov.name = 'a_new_name'
mov.save
(0.2ms)  UPDATE "products" SET "name" = 'one', "updated_at" = '2011-09-01 14:17:55.933125' WHERE "products"."id" = 2
SQL (0.1ms)  UPDATE "movies" SET "updated_at" = '2011-09-01 14:17:55.934588' WHERE "movies"."id" = 2
SQL (0.0ms)  UPDATE "products" SET "updated_at" = '2011-09-01 14:17:55.935150' WHERE "products"."id" = 2
SQL (0.0ms)  UPDATE "movies" SET "updated_at" = '2011-09-01 14:17:55.935528' WHERE "movies"."id" = 2

Environment:
DB: SQLIte3
Rails: 3.1

Ordering by

Just trying to order by a predecessor column. Is there an easy way to do this? cause I keep getting the "no such column" error.

Thanks!

problem accessing parent attributes

Just downloaded the gem and made some test on the console.
I get an error when I try to get values of attributes of the parent table (posts).
I launch the following command: @posts = BlogPost.where("posts.title = 'test'") and here is the error message I get:

ERROR: missing FROM-clause entry for table "posts"
LINE 1: SELECT "blog_posts".* FROM "blog_posts" WHERE (posts.title ...

Is that a known issue?