Rails - Jul 2005 - simple and frustrating... can you help a newbie

I have this application that I want to move to RoR. It is somewhat basic, 
but the inheritance always gets me (be patient, this is a newbie here, 
trying to learn this language, so go easy...) I have a table with customer 
data, with a primary key (id), I also have another table called
''vehicles''
which has a relationship to customer, where customer has many vehicles, and 
vehicles has one customer

What I want to do, and it seems my model is not configured right is to have 
my show screen ''show'' the customer information, and below, a
subform if you
will, display associated vehicle info, which could be 1 to say 5 cars....

I can''t seem to force ROR to return the associated vehicle that is 
associated with the customer id. no matter what I seem to do, it returns the 
customer id, or actually in this case, the primary key of the vehicles 
table.

Any suggestions? I also have a couple of more relations to deal with, but 
think once I can do this, I can take it to the next level...

Thanks for your help in advance, and thanks for all the good material that I 
have been able to gleam from this group.

Mike\


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Mike Buckley - wrote:
> 
> 
> I have this application that I want to move to RoR.   It is somewhat 
> basic, but the inheritance always gets me (be patient, this is a newbie 
> here, trying to learn this language, so go easy...)  I have a table with 
> customer data, with a primary key (id),  I also have another table 
> called ''vehicles''  which has a relationship to customer,
where customer
> has many vehicles, and vehicles has one customer
> 
> What I want to do, and it seems my model is not configured right is to 
> have my show screen ''show'' the customer information, and
below, a
> subform if you will, display associated vehicle info, which could be 1 
> to say 5 cars....
> 
> I can''t seem to force ROR to return the associated vehicle that is
> associated with the customer id.  no matter what I seem to do, it 
> returns the customer id, or actually in this case, the primary key of 
> the vehicles table.
> 
> Any suggestions?   I also have a couple of more relations to deal with, 
> but think once I can do this, I can take it to the next level...
> 
Hi Mike,

Have you set-up the relationships within the Models themselves?  If not, 
you will need to add the following to your Customer model

has_many :vehicles

and the following to your Vehicle model

belongs_to :customer

In the show action of your Customer controller, you should already be 
populating a @customer using something like Customer.find(params[:id]). 
  Because of the relationships set-up in the models, this Customer will 
have a vehicles method that returns an array of any vehicles associated 
with that Customer.  In your show view you already have access to your 
@customer and therefore also their vehicles.  You should be able to do 
something like this in your view to display a list of all vehicle makes.

<% @customer.vehicles.each { |vehicle| %>
   <%= vehicle.make %><br/>
<% } %>

In this instance, I am assuming  that you have a field in the vehicles 
db table called make but that can, of course, be changed to a valid 
field in your table.

Hope this helps,

Chris