Multiply and format with thousands separator

Rails
1

I have just started with Ruby and Rails and am still greatly confuse,
finding the usual tutorials not much help.

What I want to do is take two numbers from my database, multiply them
together and display them in a list with a comma for the thousands
separator. This would be very easy to do in a spreadsheet, so I assumed
it would be easy to do in Ruby on Rails but I can’t work out how.

I have a list.rhtml with a code snipet like

<%=h mytable.send(:value1)*mytable.send(:value2) %>

which does the multiply, but how do I do the formating?

I found this link to some Ruby code that might do this, but where would
I put it and how would I use it?

http://wiki.rubygarden.org/Ruby/page/show/NumericFormat

Thanks

Alan

2

On May 11, 6:43 pm, Alan C. [email protected]
wrote:

<%=h mytable.send(:value1)*mytable.send(:value2) %> Alan

–
Posted viahttp://www.ruby-forum.com/.

there’s this helper which lets you set the separator and delimiter,
i.e. what the comma and period does.

http://railsmanual.org/module/ActionView::Helpers::NumberHelper/number_with_delimiter/

3

[email protected] wrote:

On May 11, 6:43 pm, Alan C. [email protected]
wrote:

<%=h mytable.send(:value1)*mytable.send(:value2) %> Alan

–
Posted viahttp://www.ruby-forum.com/.

there’s this helper which lets you set the separator and delimiter,
i.e. what the comma and period does.

http://railsmanual.org/module/ActionView::Helpers::NumberHelper/number_with_delimiter/

Thanks.

I put

<%=h number_with_delimiter(mytable.send(:value1)*mytable.send(:value2)) %> in my list.rhtml and that works.

As I am new to both Ruby and Rails, I am still getting things straight.
I have two follow-up questions, if I may.

1 . Can I do an assignment

myvalue=number_with_delimiter(mytable.send(:value1)*mytable.send(:value2))

somewhere and use

<%=h myvalue %>

If so, what is the syntax and in which file do I put the assignment?

  1. I thought Ruby was OO and used methods. number_with_delimiter looks
    like a function. Is it? Shouldn’t I be using it as a method? If it’s a
    method, what is its object?

Alan

4

Alan C. wrote:

there’s this helper which lets you set the separator and delimiter,
%> in my list.rhtml

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

I think to work with rails, you have to understand mixins, class
variables vs. class instnace variables, open classes, topics like
that. I recommend David Blacks “Ruby for Rails” book. I don’t have
it in front of me, but it covers all of these, and many others,
really well,

5

[email protected] wrote:

Alan C. wrote:

there’s this helper which lets you set the separator and delimiter,
%> in my list.rhtml

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

I think to work with rails, you have to understand mixins, class
variables vs. class instnace variables, open classes, topics like
that. I recommend David Blacks “Ruby for Rails” book. I don’t have
it in front of me, but it covers all of these, and many others,
really well,

Wow. I guess I was sucked in by how easy it was to get started. This
sounds like I have to learn a lot of stuff to do anything beyond the
mere basics with Ruby on Rails.

Thanks anyway.

Alan