Rails - May 2010 - how to change one attribute (or a group of attributes) when another changes?

I have a hosts class with an ip_addresses class which has a host_id
attribute.  All hosts are associated with a data_center, and all
ip_addresses are associated with a network.  Networks have a standard
IP network definition (192.168.59.0/24) etc.  When a user changes that
network definition, I need to go through all ip_addresses in the
network and change them to agree with the new network definition.  For
example, if the network is defined as 192.168.59.0/24, and the user
changes it to 10.168.59.0/24 in the networks form, I need to change
all the ip_addresses in that network to match the new scheme.  So I
need to know when the network changes.  How do I do this?  Like, is
there a way to add code to the function that sets the network
definition?

-- 
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en.

On May 16, 2010, at 6:20 PM, chewmanfoo wrote:
> I have a hosts class with an ip_addresses class which has a host_id
> attribute.  All hosts are associated with a data_center, and all
> ip_addresses are associated with a network.  Networks have a standard
> IP network definition (192.168.59.0/24) etc.  When a user changes that
> network definition, I need to go through all ip_addresses in the
> network and change them to agree with the new network definition.  For
> example, if the network is defined as 192.168.59.0/24, and the user
> changes it to 10.168.59.0/24 in the networks form, I need to change
> all the ip_addresses in that network to match the new scheme.  So I
> need to know when the network changes.  How do I do this?  Like, is
> there a way to add code to the function that sets the network
> definition?
Add an ''after_save'' method to your Network model that checks
to see what''s changed and if appropriate goes through and changes all
of it''s IP_Address children...

-philip

-- 
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en.

On 17 May 2010 02:20, chewmanfoo
<chewmanfoo-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> I have a hosts class with an ip_addresses class which has a host_id
> attribute.  All hosts are associated with a data_center, and all
> ip_addresses are associated with a network.  Networks have a standard
> IP network definition (192.168.59.0/24) etc.  When a user changes that
> network definition, I need to go through all ip_addresses in the
> network and change them to agree with the new network definition.  For
> example, if the network is defined as 192.168.59.0/24, and the user
> changes it to 10.168.59.0/24 in the networks form, I need to change
> all the ip_addresses in that network to match the new scheme.  So I
> need to know when the network changes.  How do I do this?  Like, is
> there a way to add code to the function that sets the network
> definition?
I think you have redundant data in the db, as you are storing the ip
address and the network definition, where much of the data is common
between these two.  I suggest not storing the full ip address, just
the offset from that in the network definition, or something similar.
Then your problem will go away.

Colin

-- 
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk+unsubscribe@googlegroups.com.
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en.

Colin,

You''re right!  But I can''t go down that path right now.   In
the future I''ll
refactor the heck out of tis rats nest, but for now I have to make it work.

Jason

On Mon, May 17, 2010 at 4:20 PM, Colin Law
<clanlaw-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org> wrote:
> On 17 May 2010 02:20, chewmanfoo
<chewmanfoo-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> > I have a hosts class with an ip_addresses class which has a host_id
> > attribute.  All hosts are associated with a data_center, and all
> > ip_addresses are associated with a network.  Networks have a standard
> > IP network definition (192.168.59.0/24) etc.  When a user changes that
> > network definition, I need to go through all ip_addresses in the
> > network and change them to agree with the new network definition.  For
> > example, if the network is defined as 192.168.59.0/24, and the user
> > changes it to 10.168.59.0/24 in the networks form, I need to change
> > all the ip_addresses in that network to match the new scheme.  So I
> > need to know when the network changes.  How do I do this?  Like, is
> > there a way to add code to the function that sets the network
> > definition?
>
> I think you have redundant data in the db, as you are storing the ip
> address and the network definition, where much of the data is common
> between these two.  I suggest not storing the full ip address, just
> the offset from that in the network definition, or something similar.
> Then your problem will go away.
>
> Colin
>
> --
> You received this message because you are subscribed to the Google Groups
> "Ruby on Rails: Talk" group.
> To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
> To unsubscribe from this group, send email to
>
rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org<rubyonrails-talk%2Bunsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org>
> .
> For more options, visit this group at
> http://groups.google.com/group/rubyonrails-talk?hl=en.
>
>
-- 
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en.

Jason Michael wrote:
> Colin,
> 
> You''re right!  But I can''t go down that path right now.  
In the future
> I''ll
> refactor the heck out of tis rats nest, but for now I have to make it 
> work.
> 
> Jason
If it''s a "rats nest", it will probably be faster to refactor
than to
try to maintain it as it is.

Best,
--
Marnen Laibow-Koser
http://www.marnen.org
marnen-sbuyVjPbboAdnm+yROfE0A@public.gmane.org
-- 
Posted via http://www.ruby-forum.com/.

-- 
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en.