Rails - Jan 2008 - Basic Rails... one-to-many and "filtering" using foreign key

Hi everyone,

my apologies in advance since this is a rather trivial question, I
believe. But although I have the Pragmatic Programmers book laying on
my desk, I cant quite find a clear answer to the following question:

I have two tables - genes and organisms (therefore the models gene and
organism). Using the normal procedure, I created both models and a
controller (interface_controller) for my application.
The genes table holds information on genes, using ''id'',
''organism_id'',
and some other information. Obviously, an organism has many genes. I
thus created "belongs_to" in the gene model and "has_many"
in the
organism model. genes.organism_id references to organisms.id in the
database.

The main page displays a list of organisms in the database, but what I
have failed to figure out thus far is the following:

How do I link an organism to all its genes (via organism_id). Meaning:
How do I pass the organism_id to a method in the controller and
thereby deciding which genes are then shown in a new page
(list_genes.rhtml).  I hope that is kind of clear ;) I believe I have
to write a method in the controller "def list-genes", but I dont know
quite how.
Any advice would be greatly appreciated.

Cheers,
Marc
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pass @genes from your controller. you can fill it like this.

@organism = Organism.find(params[:id])
@genes = @organism.genes

so in your view you can do....

<% for gene in @genes %>
<%= g.name %> blah blah.

<% end %>

On Jan 22, 4:27 am, MarcHoeppner
<m...-EakUmDV/mUUVQbUkktcQLw@public.gmane.org>
wrote:
> Hi everyone,
>
> my apologies in advance since this is a rather trivial question, I
> believe. But although I have the Pragmatic Programmers book laying on
> my desk, I cant quite find a clear answer to the following question:
>
> I have two tables - genes and organisms (therefore the models gene and
> organism). Using the normal procedure, I created both models and a
> controller (interface_controller) for my application.
> The genes table holds information on genes, using ''id'',
''organism_id'',
> and some other information. Obviously, an organism has many genes. I
> thus created "belongs_to" in the gene model and
"has_many" in the
> organism model. genes.organism_id references to organisms.id in the
> database.
>
> The main page displays a list of organisms in the database, but what I
> have failed to figure out thus far is the following:
>
> How do I link an organism to all its genes (via organism_id). Meaning:
> How do I pass the organism_id to a method in the controller and
> thereby deciding which genes are then shown in a new page
> (list_genes.rhtml).  I hope that is kind of clear ;) I believe I have
> to write a method in the controller "def list-genes", but I dont
know
> quite how.
> Any advice would be greatly appreciated.
>
> Cheers,
> Marc
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