Has_many sample code for maintaining the child records?

Rails
1

Hi all,

I need some guidance as to how to get all of the pieces working for
managing a set of children records.

In my case, the parent model is Users. The child model is Referrer
codes. One user can create many referrer codes and hand them out. If
someone signs up to the site with one of their referrer codes, they get
credit for that new user. So, I need a controller with a set of actions
where they can maintain their referral codes.

What is needed is a fairly simple CRUD, just limited to that user:

I need to list just the records for the user.

I need the user to be able to add/change/delete their own codes.

Anyone have a link to a simple tutorial to show how to manage the
children records? I’d like it to be plain old html, no AJAX stuff yet,
as I’d like to get a full understanding of basic rails, and you know,
walk before I run.

Many Thanks!

Regards,
Rich

2

Hi all,

I need some guidance as to how to get all of the pieces working for >managing a set of children records.

In my case, the parent model is Users. The child model is Referrer codes. >One user can create many referrer codes and hand them out. If someone >signs up to the site with one of their referrer codes, they get credit for >that new user. So, I need a controller with a set of actions where they >can maintain their referral codes.

What is needed is a fairly simple CRUD, just limited to that user:

I need to list just the records for the user.
I need the user to be able to add/change/delete their own codes.

Anyone have a link to a simple tutorial to show how to manage the children >records? I’d like it to be plain old html, no AJAX stuff yet, as I’d like >to get a full understanding of basic rails, and you know, walk before I >run.

Many Thanks!
Regards,
Rich

Am I asking the wrong questions? It seems like many questions here
don’t get answered…

Again, Thanks.

Regards,
Rich

3

Hi!

On Oct 13, 3:12 pm, “Duzenbury, Rich” [email protected] wrote:

RichAm I asking the wrong questions? It seems like many questions here don’t get answered…
Same here… I’m not sure on why… but there are a lot of unanswered
questios.

Anyway. About your question.

If you have the “has_many” relationship in place, you can access the
collection of associated objects, as simple as this:

@collection = object.child_object

In theory, you can even use paginate… but I hasn’t done that… I just
did this:

In the controller:

def mostrar
	@persona = Persona.find(params[:id], :include => [:contribuyentes])
	@contribuyentes_asoc = @persona.contribuyentes.find(:all,:order =>

‘nombre asc’)
rescue ActiveRecord::RecordNotFound
redirect_to :action => ‘index’
end

And in the view:

Empresas asociadas

<% par_impar = 1 for contribuyente in @contribuyentes_asoc par_impar = 1 - par_impar %> <% end %>
Nombre RIF
<%= h contribuyente.nombre %> <%= h contribuyente.rif %> <%= link_to 'Ver detalles', :controller => 'contribuyentes', :action => 'mostrar', :id => contribuyente %>

That’s for listing

As for adding, just read here:

Anyway… the basic idea is to create the “new” object, and then
associate it to the collection of the user you want it to belong.

I can’t explain longer now, got work to do,

Hope this helps,

Ildefonso Camargo

4

On Oct 13, 2006, at 12:31 PM, soulhunter wrote:

Hi!

On Oct 13, 3:12 pm, “Duzenbury, Rich” [email protected] wrote:

RichAm I asking the wrong questions? It seems like many
questions here don’t get answered…

Same here… I’m not sure on why… but there are a lot of unanswered
questios.

The questions that go unanswered here are either:

  1. Very difficult questions, of which there are very few

or

  1. Questions answered here:
    http://www.pragmaticprogrammer.com/titles/rails/index.html
    of which there are many, including yours.

–
– Tom M., CTO
– Engine Y., Ruby on Rails Hosting
– Reliability, Ease of Use, Scalability
– (866) 518-YARD (9273)

5

I am using backgroundrb and getting the following error in the
backgroundrb.log file. Can anyone point me in the right direction on
what’s happening here? All seems well on the machine…Postgresql is
running, backgroundrb server running, etc. The code from the worker is
pretty large, so I didn’t want to put it out unless necessary.

“druby://localhost:42531 - #<Errno::ECONNREFUSED: Connection refused -
connect(2)> - (DRb::DRbConnError)”

Thanks,
Nathan

6

On Oct 13, 2006, at 1:20 PM, Nathan L. wrote:

Thanks,
Nathan

It looks like you are just getting a connection refused error. Are

you sure the drb server is running on the port you want and that the
clietn is using the same port? Try restarting the drb server too.
That error is just because it cannot make a connection to the drb
server so there is something wrong with your setup.

-Ezra

7

On Fri, 2006-10-13 at 13:34 -0700, Ezra Z. wrote:

That error is just because it cannot make a connection to the drb
server so there is something wrong with your setup.

-Ezra

Ezra,

Thanks for taking the time to respond, I will look my setup to see if I
can find something out of place.

I have some logging happening in the worker, so I know the process is
being spawned. I am also running the background server in a console
window, so I know that it’s running. Should I be running the background
server with a port specified? Is there anything else I should be doing
to track this down? It seems like the process is dying after it has
already been kicked off.

Nathan

8

Hi!

On Oct 13, 3:12 pm, “Duzenbury, Rich” [email protected] wrote:

Hi all,
I need some guidance as to how to get all of the pieces working for
managing a set of children records.

In my case, the parent model is Users. The child model is Referrer
codes. >One user can create many referrer codes and hand them out.
If
someone >signs up to the site with one of their referrer codes, they
get
credit for >that new user. So, I need a controller with a set of
actions
where they >can maintain their referral codes.
What is needed is a fairly simple CRUD, just limited to that user:
I need to list just the records for the user.
I need the user to be able to add/change/delete their own codes.
Anyone have a link to a simple tutorial to show how to manage the
children >records? I’d like it to be plain old html, no AJAX stuff
yet,
as I’d like >to get a full understanding of basic rails, and you know,
walk before I >run.
Many Thanks!
Regards,
RichAm I asking the wrong questions? It seems like many questions
here
@collection = object.child_object

In theory, you can even use paginate… but I hasn’t done that… I
just
rescue ActiveRecord::RecordNotFound

<%= link_to ‘Ver detalles’,

http://api.rubyonrails.org/classes/ActiveRecord/Associations/ClassMethod
s.

Many thanks. I’ll continue working on this.

Regards
Rich

9

Hi!

On Oct 13, 3:12 pm, “Duzenbury, Rich” [email protected] wrote:

RichAm I asking the wrong questions? It seems like many
questions here don’t get answered…

Same here… I’m not sure on why… but there are a lot of
unanswered
of which there are many, including yours.
Sigh. I have a copy of Rails Recipes. I have a copy of Ruby for Rails.
I have an old v1 copy of AWDWR. Especially, my AWDWR is well worn. The
examples and text in these books cover the simplest cases, for example
scaffolding. They do an excellent job explaining how to build the
model. They DO NOT, in my opinion, do a good enough job to cover how to
glue things together correctly on a more-than-toy type of scale.

I don’t mind digging around in the books. I don’t mind digging around
in google. I have done so. If you have a particular page number in a
particular book in mind, by all means, tell me, and I’ll go do more
reading.

Thanks.

Regards,
Rich

10

You could have something within the dowork() method that is killing
backgroundrb, however it doesn’t seem all too likely. I would verify
with
‘netstat -anp’ that backgroundrb is listening. I’ve been using
backgroundrb
for 2 months now and I’ve only encountered this if indeed the server is
not
running.

11

Hi!

On Oct 13, 3:41 pm, Tom M. [email protected] wrote:

questios.The questions that go unanswered here are either:

  1. Very difficult questions, of which there are very few

or

  1. Questions answered here:
    http://www.pragmaticprogrammer.com/titles/rails/index.html
    of which there are many, including yours.

Including… mine?, please, give me the page number, or at least the
chapter, I got the v1 book (still hasn’t got the v2):

http://groups-beta.google.com/group/rubyonrails-talk/browse_thread/thread/90bfa34beb62beb4/a002279e8a74ad85?lnk=gst&q=soulhunter&rnum=1#a002279e8a74ad85

You can get to it doing a search for: auto_complete_for
reimplementation in this forum.

Please read correctly: I don’t want an custom “auto_complete_for” for
just one autocomplete, but for MANY, and thus I don’t want to write
the same code, or copy and paste, and replace, and then maintain 20 or
copies of the function.

If you assure that the answer to that question is answered in v2
book, and not in v1… I will go and buy it.

I found the book to be too basic, and too “toy-like”… for real apps
you can’t depend on scaffolds and such things… yes, you use them, but
they are not the “whole” app.

I ended up learning a lot more doing everything from “scratch”, and not
using the code generators.

Please, be more carefull when you use the “RTFM” answer to some
question,

c-ya!

Ildefonso Camargo

12

Tom M. wrote:

questios.

–
– Tom M., CTO
– Engine Y., Ruby on Rails Hosting
– Reliability, Ease of Use, Scalability
– (866) 518-YARD (9273)

So if you are looking for Ruby on Rails hosting whose version of tech
support is, “Go read the manual.” here’s a good choice!

Ron

13
  1. Questions answered here:
    http://www.pragmaticprogrammer.com/titles/rails/index.html
    of which there are many, including yours.

So if you are looking for Ruby on Rails hosting whose version of tech
support is, “Go read the manual.” here’s a good choice!

I’m really very sorry if that response sounded negative. I was answering
the question “why are many questions unanswered” as factually as I knew
how. Rails is a wonderful thing, but it’s very difficult to grok it’s
subtle beauty without reading the book, as it’s the de-facto manual at
this point in time.

I certainly didn’t mean to imply any negativity in the response, either
toward any previous poster, or the list in general.

After many years on mailing lists I should have recognized that the tone
of that message could be easily misinterpreted.

My most sincere apologies to any and all offended parties. I was really
trying to be helpful and answer the question at hand.

Readers of list will hopefully recognize that Ezra and I both put in
quite
a bit of time answering questions on this list. Hopefully our history
will speak louder than any misunderstanding over the intent of a single
message.

–
– Tom M., CTO
– Engine Y., Ruby on Rails Hosting
– Reliability, Ease of Use, Scalability
– (866) 518-YARD (9273)

14

Hi!

I just remember that this exists:

http://rorsublist.rubyforge.org/

Looks pretty usefull, I’ll use part of it in a part of my project that
needs to do almost the same you need.

Hope this helps,

Ildefonso Camargo