Hello,
I''ve got three tables:
site {
id
name,
customer_id
}
building {
id,
site_id,
name
}
equipment {
id,
building_id,
name
}
In my building model I have "belongs_to :site" and in my equipment
model I have "belongs_to :building".
How do I find all pieces of equipment that belong to a particular
customer?
I tried something like Equipment.find(:all, :include =>
[ :building, :site ], :conditions => ''customer_id = 1''),
but of course
that doesn''t work because there''s nothing about :site in the
equipment
model. I also tried to put ":include => :site" in the
"belongs_to" in
the building model, but I got an error saying that the association
named ":site" wasn''t found.
Any ideas?
Thanks!
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On Jul 4, 2007, at 1:08 PM, surge wrote:> Hello, > > I''ve got three tables: > > site { > id > name, > customer_id > } > > building { > id, > site_id, > name > } > > equipment { > id, > building_id, > name > } >Where''s Customer?> In my building model I have "belongs_to :site" and in my equipment > model I have "belongs_to :building". > > How do I find all pieces of equipment that belong to a particular > customer?Do you also have: class Site has_many :buildings end and so on?> > I tried something like Equipment.find(:all, :include => > [ :building, :site ], :conditions => ''customer_id = 1''), but of course > that doesn''t work because there''s nothing about :site in the equipment > model. I also tried to put ":include => :site" in the "belongs_to" in > the building model, but I got an error saying that the association > named ":site" wasn''t found. > > Any ideas? > > Thanks!Your table names should be plural (e.g., ''sites'' and ''buildings'') unless you have overridden this with set_table_name in your model. You can also try: Equipment.find(:all, :include => { :building => :site }, :conditions => [ ''site.customer_id = ?'', some_customer ]) but even if that works as-is, you should consider the other parts (adding "has_many" associations to mirror your "belongs_to"; having a customer model and table; pluralizing your tables) as means to avoid future aggravation. -Rob Rob Biedenharn http://agileconsultingllc.com Rob-xa9cJyRlE0mWcWVYNo9pwxS2lgjeYSpx@public.gmane.org --~--~---------~--~----~------------~-------~--~----~ 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-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
> Where''s Customer?I tried to shorten my question, that''s why I didn''t show all the relevant relationships. I do have the customer model.> Your table names should be plural (e.g., ''sites'' and ''buildings'')They are. They aren''t in the example though. Good catch :)> Equipment.find(:all, :include => { :building => :site }This worked like a charm. I need to read about that variation of :include. Cool!> (adding "has_many" associations to mirror your "belongs_to"; having aWell, so far I haven''t needed to reverse. Is that a no-no not to mirror it? Thanks Rob. You saved me a lot of searching. Much appreciate. --~--~---------~--~----~------------~-------~--~----~ 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-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
> Well, so far I haven''t needed to reverse. Is that a no-no not toI meant to say "I haven''t needed the reverse relationship" --~--~---------~--~----~------------~-------~--~----~ 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-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---