Hi,
I have a simple program that tries to do something really basic.
First, I have a company Model :
class Company < ActiveRecord::Base
has_one :billingAddress, :foreign_key=>“id”, :class_name=>“Address”
end
Then I have the address Model :
class Address< ActiveRecord::Base
belongs_to :company
end
I’ve created manually an entry in the DB for Address and Company and
I’ve linked them (Company table has a “billingAddress_id” row)
In my views “company/_form”(scaffold generated), I want to display the
address form. So I added (following Rails Guides) the following line to
my view :
<%= render :partial => “addresses/edit”, :locals => { :shippingAddress
=> @address} %>
It keeps saying : "undefined method `model_name’ for NilClass:Class "
tried this :
<%= render :partial => “addresses/edit”, :locals => {
@company.shippingAddress => @address} %>
with the same result
I’ve tried with :
<%= render :partial => “addresses/form”, :object => @billingAddress%>
and I got the same result (this is normal I think since I don’t have a
billingAddress object but a Company object.
Finally, I’ve tried :
<%= :partial => “addresses/form”, :object => @company.shippingAddress %>
and the error I got was :
syntax error, unexpected tASSOC, expecting ')
When I load the Company with rails console, it loads perfectly. However
I cannot manage to call the aggregated object view since the name of the
variable is not the same name as the class name… at least, that what I
think it is 
Can someone help me to figure this out ? I thought that this will be a
simple task but it figures that it is not…
Thank you very much for your time !
On 10 May 2010 13:49, Greg R. [email protected] wrote:
class Address< ActiveRecord::Base
<%= render :partial => “addresses/edit”, :locals => { :shippingAddress
=> @address} %>
It keeps saying : "undefined method `model_name’ for NilClass:Class "
tried this :
In the partial have you got something.model_name? If so then
‘something’ is nil.
In the traceback when you get the error message you should be able to
see the line that is failing.
Colin
Colin L. wrote:
On 10 May 2010 13:49, Greg R. [email protected] wrote:
class Address< ActiveRecord::Base
<%= render :partial => “addresses/edit”, :locals => { :shippingAddress
=> @address} %>
It keeps saying : "undefined method `model_name’ for NilClass:Class "
tried this :
In the partial have you got something.model_name? If so then
‘something’ is nil.
In the traceback when you get the error message you should be able to
see the line that is failing.
Colin
Thanks Colin for the fast answer :
In the partial I have the “standard” scaffolded code for my Address
class
So it’s a “form_for @address” just like Rails 3 is generates…
so I don’t understand why I can go to /addresses/1 and see the form but
I cant view the same info via a partial.
On May 10, 2:49 pm, Greg R. [email protected] wrote:
Hi,
I have a simple program that tries to do something really basic.
First, I have a company Model :
class Company < ActiveRecord::Base
has_one :billingAddress, :foreign_key=>“id”, :class_name=>“Address”
end
I think your problem is in :foreign_key=>“id” part. This means that
foreign key to address is named ‘id’ which is actually id column for
Company model. Remove this part if your foreign key column is
‘address_id’ or use real column name, i.e. ‘billing_address_id’
otherwise
Regards,
Bosko
On 10 May 2010 14:04, Greg R. [email protected] wrote:
In the traceback when you get the error message you should be able to
see the line that is failing.
Colin
Thanks Colin for the fast answer :
In the partial I have the “standard” scaffolded code for my Address
class
So it’s a “form_for @address” just like Rails 3 is generates…
You did not say you are using Rails 3 (unless I missed it). I have no
experience of Rails 3, which is still under development. You did not
answer the question as to whether you are accessing
something.model_name, nor whether the trace shows the failing line.
You do not specify your knowledge level, if you are just starting I
would not recommend rails 3. You will never know whether a problem is
down to your experience or a problem with rails itself.
Colin
You did not say you are using Rails 3 (unless I missed it). I have no
experience of Rails 3, which is still under development. You did not
answer the question as to whether you are accessing
something.model_name, nor whether the trace shows the failing line.
You do not specify your knowledge level, if you are just starting I
would not recommend rails 3. You will never know whether a problem is
down to your experience or a problem with rails itself.
Colin
Hi Colin,
Yes I’m using Rails 3. My knowledge level is … well, begginer since
I’m not able to make this thing works 
My years of experience are
with PHP and .Net. I’m trying Rails because it looks interesting and
promising (once I’ll get a solid grip on basic things like this!)
Here is my partial view for the Address class.
1<%= form_for(@address) do |f| %>
2
3 <%= f.label :city %>
4 <%= f.text_field :city %>
5
6
7<% end %>
The failling line is #3. I’m able to load the partial if I put in it a
string and no code (like "
TEST
"). I’m not sure that I
understand what you meant by “something.model_name” … As for Rails 3,
they said on guides.rails.info :
“But if you’re starting development on a new application and you don’t
mind getting wind in your hair, please do jump on board!” I’m starting
a new app and I’m eager to learn so that’s what I’ve done… is it a
choice that bad ?
Thank you for you replies !
Greg
On 10 May 2010 14:31, Greg R. [email protected] wrote:
4 <%= f.text_field :city %>
5
6
7<% end %>
The failling line is #3. I’m able to load the partial if I put in it a
string and no code (like “
TEST
”). I’m not sure that I
understand what you meant by “something.model_name”
I think Bosko may well have the answer. I was assuming that one of
your models had a file model_name but I see now that this is the rails
model it is talking about.
… As for Rails 3,
they said on guides.rails.info :
“But if you’re starting development on a new application and you don’t
mind getting wind in your hair, please do jump on board!” I’m starting
a new app and I’m eager to learn so that’s what I’ve done… is it a
choice that bad ?
I think this may have been intended for experienced users starting a
new app rather than beginners. You will not find many tutorials and
guides for rails 3 yet. I would consider going back to 2.3.x and
starting with the guides at http://guides.rubyonrails.org/
Colin
@Bosko : I’ll try your suggestion tonight and keeps you posted.
@Collin : Thanks for your time… I’ll check for rails 2.3.x and if I’m
not able to make this work, I may roll back
Thank you guys for your help !
