Rails - Mar 2006 - Displaying related tables in forms.. probably an easy question!

Hey All,

I have two tables.. One belongs to another. Why can''t I reference
table1.table2.attribute?

Specifically, using scaffolding:
property.rb - 
has_one :PropertyType

property_type.rb - 
has_many :Properties

property_controller - 
def list
  @property_pages, @properties = paginate :properties, :per_page => 10
end

list.html:
1. <% for property in @properties %>
2.   <tr>
3.     <% for column in Property.content_columns %>
4.       <td>
5.         <%=h property.send(column.name) %>
6.       </td>
7.     <% end %>
8.     <td><%=h property.propertytype.name %></td>
9. <% end %>

Two questions:
1) I get an error stating that I am trying to reference the propertytype
method on line #8.  I thought I was doing this right, I''m using the
local variable (not the instance variable which is an array of objects
in this case).
2) Am I doing my has_one and belongs_to statements right?  Some
documentation seems to say that you only need to use has_one and you
don''t need belongs to?  I thought you always needed them as a pair?

- Brian

You just have your associations setup wrong.
Property:
belongs_to :property_type

PropertyType:
has_many :properties

Try that and see how she flys!

On 3/8/06, Brian Corrigan <brian.corrigan@mm-games.com>
wrote:
>
> Hey All,
>
> I have two tables.. One belongs to another. Why can''t I reference
> table1.table2.attribute?
>
> Specifically, using scaffolding:
> property.rb -
> has_one :PropertyType
>
> property_type.rb -
> has_many :Properties
>
> property_controller -
> def list
>   @property_pages, @properties = paginate :properties, :per_page => 10
> end
>
> list.html:
> 1. <% for property in @properties %>
> 2.   <tr>
> 3.     <% for column in Property.content_columns %>
> 4.       <td>
> 5.         <%=h property.send(column.name) %>
> 6.       </td>
> 7.     <% end %>
> 8.     <td><%=h property.propertytype.name %></td>
> 9. <% end %>
>
> Two questions:
> 1) I get an error stating that I am trying to reference the propertytype
> method on line #8.  I thought I was doing this right, I''m using
the
> local variable (not the instance variable which is an array of objects
> in this case).
> 2) Am I doing my has_one and belongs_to statements right?  Some
> documentation seems to say that you only need to use has_one and you
> don''t need belongs to?  I thought you always needed them as a
pair?
>
> - Brian
> _______________________________________________
> Rails mailing list
> Rails@lists.rubyonrails.org
> http://lists.rubyonrails.org/mailman/listinfo/rails
>
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The fact that you named property_type the way you did with an underscore 
makes it especially important that you understand how Rails deals with 
names. I''m not 100% sure, but try referencing property.property_type, 
with the underscore. Rails will know it as PropertyType and 
property_type depending on the context, but not as propertytype.


Brian Corrigan wrote:
> Hey All,
> 
> I have two tables.. One belongs to another. Why can''t I reference
> table1.table2.attribute?
> 
> Specifically, using scaffolding:
> property.rb -
> has_one :PropertyType
> 
> property_type.rb -
> has_many :Properties
> 
> property_controller -
> def list
>   @property_pages, @properties = paginate :properties, :per_page => 10
> end
> 
> list.html:
> 1. <% for property in @properties %>
> 2.   <tr>
> 3.     <% for column in Property.content_columns %>
> 4.       <td>
> 5.         <%=h property.send(column.name) %>
> 6.       </td>
> 7.     <% end %>
> 8.     <td><%=h property.propertytype.name %></td>
> 9. <% end %>
> 
> Two questions:
> 1) I get an error stating that I am trying to reference the propertytype
> method on line #8.  I thought I was doing this right, I''m using
the
> local variable (not the instance variable which is an array of objects
> in this case).
> 2) Am I doing my has_one and belongs_to statements right?  Some
> documentation seems to say that you only need to use has_one and you
> don''t need belongs to?  I thought you always needed them as a
pair?
> 
> - Brian

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