Rails - Aug 2006 - question about hashes in views that model a table?

if i have a table called cars with columns called year and type, and i 
create a model and do this

@mycars = Cars.find(:all)

in my view i have something like this

for cars in @mycars
 do something like print out cars.type


i know that @mycars in a hash where each key is a column name paired 
with its corresponding value right?

without the for loop, how can i access the 2nd record directly?
   @mycars[0].type = ?



how does the variables in the view know that cars relate to the Cars 
table?

is that for loop the same as something like this in c++

for (int i = 0; i < mycars.total; i++)









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

ive also wondered this.

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

baker1 wrote:
> if i have a table called cars with columns called year and type, and i 
> create a model and do this
> 
> @mycars = Cars.find(:all)
> 
> in my view i have something like this
> 
> for cars in @mycars
>  do something like print out cars.type
> 
> i know that @mycars in a hash where each key is a column name paired 
> with its corresponding value right?
@mycars will be an array of Car objects, each containing an attribute
hash with column name keys.
> without the for loop, how can i access the 2nd record directly?
>    @mycars[0].type = ?
@mycars[1].type = ?, though you probably will not know what car
this is unless you use an :order option in your find that is
some sort of consecutive sequence number.

-- 
We develop, watch us RoR, in numbers too big to ignore.

hi mark, thanks for the response

so it is an array of carobjects, where each car object is a hash with 
each key being a column name in a table.

Mark Reginald James wrote:
> baker1 wrote:
>> i know that @mycars in a hash where each key is a column name paired 
>> with its corresponding value right?
> 
> @mycars will be an array of Car objects, each containing an attribute
> hash with column name keys.
> 
>> without the for loop, how can i access the 2nd record directly?
>>    @mycars[0].type = ?
> 
> @mycars[1].type = ?, though you probably will not know what car
> this is unless you use an :order option in your find that is
> some sort of consecutive sequence number.
> 
> --
> We develop, watch us RoR, in numbers too big to ignore.

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

koloa wrote:
> hi mark, thanks for the response
> 
> so it is an array of carobjects, where each car object is a hash with 
> each key being a column name in a table.
A Car object is a proper Ruby object that contains many things.
One of these things is an @attributes instance variable (also
accessible through the "attributes" method), which is a hash with
column name keys.  But you usually don''t access this directly.
Rather you use either the attribute access square brackets operator,
or the automatic column-named attribute methods.  That is, the
following are equivalent ways to access the "make" column value
of the first Car object found:

         @mycars[0].attributes[''make'']
         @mycars[0][''make'']
         @mycars[0][:make]
         @mycars[0].make

-- 
We develop, watch us RoR, in numbers too big to ignore.