Rails - Jul 2007 - single table inheritance problem

Hallo,

I am having a very strange Problem with STI in my application.

setup:
- two tables one called "wikis" on called "categories" with
a hbtm
relationship.
- the wikis table is the sti one with a model PageWiki being extended
from Wiki (and the correspondig type column)

Following happens:
- server restart
- get :wikis, :show_pages
- in show_pages the first line says PageWiki.find(:all)
! Now I get the following error

LoadError in WikisController#list_pages
app/models/page_wiki.rb to define PageWiki // (it is of course defined
there )

If i call the page again everythings works as it should be and the the
error message never appears again until the server restarts
BUT !
When I now try to add categories to my wikis with

@wiki = Wiki.find(params[:wiki])
@category = Category.find(params[:id])
@wiki.categories << @category unless
@wiki.categories.index(@category)

I get the VERY unhelpful error messages telling me

ActiveRecord::AssociationTypeMismatch
in WikisController#add_category
Category expected, got Category

This error does not appear if do not call the list_pages method
before.

If I change the line PageWiki.find(:all) to
Wiki.find(:all, :conditions =>"type=''PageWiki''")
it all works.

Does anybody have any ideas what happens here?
Thanks a lot for any help.

migo


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Hallo,

I am having a very strange Problem with STI in my application.

setup:
- two tables one called "wikis" on called "categories" with
a hbtm
relationship.
- the wikis table is the sti one with a model PageWiki being extended
from Wiki (and the correspondig type column)

Following happens:
- server restart
- get :wikis, :show_pages
- in show_pages the first line says PageWiki.find(:all)
! Now I get the following error

LoadError in WikisController#list_pages
app/models/page_wiki.rb to define PageWiki // (it is of course defined
there )

If i call the page again everythings works as it should be and the the
error message never appears again until the server restarts
BUT !
When I now try to add categories to my wikis with

@wiki = Wiki.find(params[:wiki])
@category = Category.find(params[:id])
@wiki.categories << @category unless
@wiki.categories.index(@category)

I get the VERY unhelpful error messages telling me

ActiveRecord::AssociationTypeMismatch
in WikisController#add_category
Category expected, got Category

This error does not appear if do not call the list_pages method
before.

If I change the line PageWiki.find(:all) to
Wiki.find(:all, :conditions =>"type=''PageWiki''")
it all works.

Does anybody have any ideas what happens here?
Thanks a lot for any help.

migo


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I have to correct myself here.
Although things work (dont work) in the order described the
 Category expected, got Category
Error message still appears after a while and then continues to be
there until a server restart.
Now this is really a problem! A bit of googling revealed that is has
to do with the plugins used.
So these are the plugins used:
acts_as_versioned
acts_as_tree
globalize

Any idea ?


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I am having trouble getting a single table inheritance to work. This is
what I tried I made a base model called Product, made the migration with
all columns for every type of product that I want to create. Also in my
migration I made a column called type to differentiate between classes.
Also, from what I read in AWD I put the :force -> true option after the
table name.
So now I ran the rake db migrate and it made the table. Then I made a
class called DealProduct and I put it in the models folder as
deal_product.rb. I also made it inherit the base class Product. So I
had:

DealProduct < Product
end

So then I made a controller called deal_product, and then I tried
generating the scaffolding for the controller and the DealProduct
controller, and it throws an error saying "Before updating scaffolding
from new DB schema, try creating a table for your model (DealProduct),"
but if I have it inherited from my base class Product, why is it
throwing me this error, shouldn''t it know that it already has one? And
am I even doing this right, is there anything that would make this not
work?
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OOOOO, I got it, so I wasn''t generating the model first, I was just 
creating a new class. So what I did was generate the model, then in the 
model I put self.inheritance_column = ''type'' (don;t know if I
needed
this, but I saw it in the rails API), and then I ran rake db:migrate 
again to create the table. Now I generated the scaffolding for the 
controller and model and it worked !!!! :)

But if anyone could tell me if I need that self.inheritance_column 
declaration in my child classes that would be great.

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