Next Record

Rails
1

Okay, I know this will probably be a very easy question. But I am
discovering that RonR makes just about everything easy. The problem is,
it takes me a few hours to figure out that I can do it the easy way.

I need to know how to move to the next record in a database. I want to
format my out put in a table. For example, I want a 3 by 3 table. So
record one goes in the first cell, record two goes in the middle top
cell, etc.

Thanks.

-Ross

2

Ross:

controller

@record = Model.find(:all) – record could have been ‘x’ or anything
else you like. :all can be limited using :conditions

in the view you put

@record.each do |r|

etc....

<%end%>

header
<%=r.name%>
3

Thanks for the reply, but that does not quite work. It puts everything
in one row. But I need multiple rows and columns, like this:

Record 1 Record 2 Record 3

Record 4 Record 5 Record 6

Record 7 Record 8 Record 9

In ASP I would use a MoveNext method and 2 For…Next loops to handle
this. So, what is the RonR equivalent of MoveNext?

Thanks.

-Ross

bruce balmer wrote:

Ross:

controller

@record = Model.find(:all) – record could have been ‘x’ or anything
else you like. :all can be limited using :conditions

in the view you put

@record.each do |r|

etc....

<%end%>

header
<%=r.name%>
4

Well, how about this:

@x = Model.find(:all)

This produces an array of objects, one object for each row you will
have pulled down.

in the cells respectively, I would place

Then each record you want would be in the appropriately numbered
array element. ie. first record would be in @x[0], next record in @x[1]

So I’d write two loops, one to go sideways ([0] [1] [2]) and one
to go vertically ie [0] [3] [6] et
voilà.
Two loops counting through the array elements where @x = the array.

bruce

5

Something like this would work with just one loop. Making it
prettier is left as an exercise for the reader.
-Rob

<% records = @Record.find(:all) per_row = 3 records.each_index { |position| if position.modulo(per_row).zero? -%> <% end -%> <% if position.next.modulo(per_row).zero? -%> <% end } if ! records.length.modulo(per_row).zero? -%> <% end -%>
Record <%= "#{position.next}: #{records[position].name}" %>
6

This is ugly, but lets you change the # of columns very easily:

<%

myCount = 0
numColumns = 3

@records.each do |record|
if myCount % numColumns == 0
%>

<%
end
%> <%= record %>
if myCount == numColumns
%><%
end
end
%>
7

Whoops… typo… make sure you increment the myCount variable before
the
end of the @records.each loop… sorry about that…

-Will

On 1/17/06, Will B. [email protected] wrote:

%><tr><%

end
%> <%= record %>
if myCount == numColumns
%><%
end

end

8

On 1/17/06, Ross M. [email protected] wrote:

In ASP I would use a MoveNext method and 2 For…Next loops to handle
this. So, what is the RonR equivalent of MoveNext?

Not sure if there is an equivalent, but something like this may work:

For m columns (assuming records/length is cleanly divisible by m)

<% 0.upto(@records.length/m-1) do |i| -%>

<% 0.upto(m-1) do |j| -%> <%= @records[m*i+j] %> <% end %> <% end %>
9

Ross M. wrote:

In ASP I would use a MoveNext method and 2 For…Next loops to handle
this. So, what is the RonR equivalent of MoveNext?

You could use each_index, but I prefer to shift elements off lists
because it’s so much more readable:

<% while @records.length > 0 -%> <% 3.times do -%> <% end -%> <% end -%>
<%= @records.shift.name %>