Rails - Aug 2006 - passing hash from controller to view and pluralization?

hi,
i have 2 tables (counties and towns). counties has_many towns and towns 
belong_to counties.

now my question:

i thought i would need to do is say @counties = Counties.find(:all). 
should that not return to me all counties in the counties table WITH all 
towns associated with each county?


in my view i was getting error when doing this

 if(counties.has_towns?)

saying undefined has_towns methods...




another question about plurulization. if i were to say @county vs 
@counties, is there a difference? would RoR assume i just want 
information for 1 county? or does RoR treat it like the same variable?

-- 
Posted via http://www.ruby-forum.com/.

Also, your controller should be

  @counties = Counties.find(:all)

Then your view should have

  <% @counties.each do |county| %>
    <% if county.towns.any? %>
      <%= link_to county.name, :action => ''show'', :id
=> county %><br />
    <% end %>
  <% end %>

Or something similar.

Note that in your example you cant call any model specific methods on 
@counties because it is an array of County objects, not a county object 
itself.

-- 
Posted via http://www.ruby-forum.com/.

baker1 wrote:
> in my view i was getting error when doing this
> 
>  if(counties.has_towns?)
> 
> saying undefined has_towns methods...
If you have "has_many :towns" in your model definition, than
"towns" is
the methods you use to access the association.

  @county.towns #=> an array of Town objects

If you want to know if this county has any associated towns, remember 
that it returns an array.  So you can use any array methods on it.

  if @county.towns.any?
    do_stuff
  end
> another question about plurulization. if i were to say @county vs 
> @counties, is there a difference? would RoR assume i just want 
> information for 1 county? or does RoR treat it like the same variable?
It''s entirely up to you.  Rails doesn''t care what you name
your
variables.

  def index
    @foo = Something.find(1)
    @bar = Domething.find(:all)
  end

Now from index.rhtml @foo is a single Something object, and @bar is an 
array of Something objects.  However convention tell us it''s best to 
names arrays of things plural and single object singular.

-- 
Posted via http://www.ruby-forum.com/.

hello alex, i really appreciate your help!


if @county.towns contains the towns for the particular county, how can i 
now increment to the next county and show the next set of towns?


 basically id like to display something like this

    for county in @counties
        print county name

        for towns in @counties
            print town name
        end
    end

is this possible or do i need more than one data container passed to the 
view?





Alex Wayne wrote:
> baker1 wrote:
>> in my view i was getting error when doing this
>> 
>>  if(counties.has_towns?)
>> 
>> saying undefined has_towns methods...
> 
> If you have "has_many :towns" in your model definition, than
"towns" is
> the methods you use to access the association.
> 
>   @county.towns #=> an array of Town objects
> 
> If you want to know if this county has any associated towns, remember 
> that it returns an array.  So you can use any array methods on it.
> 
>   if @county.towns.any?
>     do_stuff
>   end
> 
>> another question about plurulization. if i were to say @county vs 
>> @counties, is there a difference? would RoR assume i just want 
>> information for 1 county? or does RoR treat it like the same variable?
> 
> It''s entirely up to you.  Rails doesn''t care what you
name your
> variables.
> 
>   def index
>     @foo = Something.find(1)
>     @bar = Domething.find(:all)
>   end
> 
> Now from index.rhtml @foo is a single Something object, and @bar is an 
> array of Something objects.  However convention tell us it''s best
to
> names arrays of things plural and single object singular.

-- 
Posted via http://www.ruby-forum.com/.

baker1 wrote:
> 
> hello alex, i really appreciate your help!
> 
> 
> if @county.towns contains the towns for the particular county, how can i 
> now increment to the next county and show the next set of towns?
> 
> 
>  basically id like to display something like this
> 
>     for county in @counties
>         print county name
> 
>         for towns in @counties
>             print town name
>         end
>     end
> 
> is this possible or do i need more than one data container passed to the 
> view?
you almost have it

<% for county in @counties %>
  <h1><%= county.name %></h1>
  <% for town in county.towns %>
    <p><%= town.name %></p>
  <% end %>
<% end %>

-- 
Posted via http://www.ruby-forum.com/.

hey Alex thanks, i will try this when i get home today.

coming from a c++ perspective, i am still having difficulty 
understanding how ruby and rails work. its like what are big no-no''s in
c++ is a.o.k. in ruby!

a few more questions if you dont mind:

now @counties is the object i declared in my controller that contains 
everything that my mySql counties table has? what is singular
''county''
in the for loop? is that the same as saying

for(int i = 0; i < number of counties in counties table; i++)
{
  do stuff to each county etc...?

}


Alex Wayne wrote:
> baker1 wrote:
>> 
>> hello alex, i really appreciate your help!
>> 
>> 
>> if @county.towns contains the towns for the particular county, how can
i
>> now increment to the next county and show the next set of towns?
>> 
>> 
>>  basically id like to display something like this
>> 
>>     for county in @counties
>>         print county name
>> 
>>         for towns in @counties
>>             print town name
>>         end
>>     end
>> 
>> is this possible or do i need more than one data container passed to
the
>> view?
> 
> you almost have it
> 
> <% for county in @counties %>
>   <h1><%= county.name %></h1>
>   <% for town in county.towns %>
>     <p><%= town.name %></p>
>   <% end %>
> <% end %>

-- 
Posted via http://www.ruby-forum.com/.

Hi,

Assuming that in your view the only hash you receive is @counties we can iterate
its members this way:

    for county in @counties
        print county.name

        for town in county.towns
            print town.name
        end
    end

--Romeu

-----Mensagem original-----
De: rails-bounces@lists.rubyonrails.org
[mailto:rails-bounces@lists.rubyonrails.org] Em nome de baker1
Enviada em: quinta-feira, 10 de agosto de 2006 17:22
Para: rails@lists.rubyonrails.org
Assunto: [Rails] Re: passing hash from controller to view and pluralization?


hello alex, i really appreciate your help!


if @county.towns contains the towns for the particular county, how can i 
now increment to the next county and show the next set of towns?


 basically id like to display something like this

    for county in @counties
        print county name

        for towns in @counties
            print town name
        end
    end

is this possible or do i need more than one data container passed to the 
view?





Alex Wayne wrote:
> baker1 wrote:
>> in my view i was getting error when doing this
>> 
>>  if(counties.has_towns?)
>> 
>> saying undefined has_towns methods...
> 
> If you have "has_many :towns" in your model definition, than
"towns" is
> the methods you use to access the association.
> 
>   @county.towns #=> an array of Town objects
> 
> If you want to know if this county has any associated towns, remember 
> that it returns an array.  So you can use any array methods on it.
> 
>   if @county.towns.any?
>     do_stuff
>   end
> 
>> another question about plurulization. if i were to say @county vs 
>> @counties, is there a difference? would RoR assume i just want 
>> information for 1 county? or does RoR treat it like the same variable?
> 
> It''s entirely up to you.  Rails doesn''t care what you
name your
> variables.
> 
>   def index
>     @foo = Something.find(1)
>     @bar = Domething.find(:all)
>   end
> 
> Now from index.rhtml @foo is a single Something object, and @bar is an 
> array of Something objects.  However convention tell us it''s best
to
> names arrays of things plural and single object singular.

-- 
Posted via http://www.ruby-forum.com/.
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