When I do this I obtain nil:
current_shipment = current_entry.shipment
The models look like this:
class CaCustomsShipment < ActiveRecord::Base
has_one :ca_customs_entry
has_one :entry,
:class_name => ''CaCustomsEntry'' #short form
def to_param
shipment_identifier
end
class CaCustomsEntry < ActiveRecord::Base
belongs_to :ca_customs_shipment
belongs_to :shipment, :class_name => ''CaCustomsShipment''
def to_param
cctn
end
If I fetch the rows individually via .first then I see this:
--- !ruby/object:CaCustomsEntry
attributes:
. . .
created_at: 2011-02-22 16:40:49.085782
. . .
ca_customs_shipment_id: "111"
and
--- !ruby/object:CaCustomsShipment
attributes:
. . .
lock_version: "0"
id: "111"
. . .
However, If I do this:
puts( CaCustomsShipment.first.entry.to_yaml )
puts( CaCustomsEntry.first.shipment.to_yaml )
The first puts displays the entry I expect but the second returns nil. I
also discovered that this fails:
CaCustomsShipment( CaCustomsEntry.first.ca_customs_shipment_id )
but this succeeds
CaCustomsShipment.find_by_id(
CaCustomsEntry.first.ca_customs_shipment_id )
This gave rise to the thought that perhaps I was handling the to_param
methods incorrectly. I tried removing the to_param definitions from the
respective models but the program behaviour does not appear to change.
Clearly I am missing something or other in the association method call
but I cannot seem to find what that something is.
Does anyone here see what I am doing wrong?
--
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.
James Byrne wrote in post #983156:> When I do this I obtain nil: > > current_shipment = current_entry.shipment >. . .> > Clearly I am missing something or other in the association method call > but I cannot seem to find what that something is. > > Does anyone here see what I am doing wrong?What I did was to change the association call named #shipment to: current_shipment = current_entry.ca_customs_shipment and things worked. So, now my question is: what is wrong with this code? # #shipment returns nil always belongs_to :shipment, :class_name => ''CaCustomsShipment'' # returns ca_customs_shipment belongs_to :ca_customs_shipment -- 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.
On 22 February 2011 18:34, James Byrne <lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote:> James Byrne wrote in post #983156: >> When I do this I obtain nil: >> >> current_shipment = current_entry.shipment >> > . . . >> >> Clearly I am missing something or other in the association method call >> but I cannot seem to find what that something is. >> >> Does anyone here see what I am doing wrong? > > What I did was to change the association call named #shipment to: > > current_shipment = current_entry.ca_customs_shipment > > and things worked. So, now my question is: what is wrong with this > code? > > # #shipment returns nil always > belongs_to :shipment, :class_name => ''CaCustomsShipment''Perhaps you need :foreign_key here also. Colin> > # returns ca_customs_shipment > belongs_to :ca_customs_shipment > > -- > 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@googlegroups.com. > 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@googlegroups.com. For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.
Colin Law wrote in post #983199:> > Perhaps you need :foreign_key here also. > > ColinI will try this if I ever go back to that idiom. Based on your suggestion I discover that this parameter is required only for the belongs_to method. The API documentation does not give an explicit example of this usage early up in the introduction where I think it might be very helpful. -- 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.
On 22 February 2011 21:23, James Byrne <lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote:> Colin Law wrote in post #983199: > >> >> Perhaps you need :foreign_key here also. >> >> Colin > > I will try this if I ever go back to that idiom. Based on your > suggestion I discover that this parameter is required only for the > belongs_to method. The API documentation does not give an explicit > example of this usage early up in the introduction where I think it > might be very helpful.Sometimes you need it on the has_many association also. So if Foo has_many :bars and the key in bars is not foo_id then you will need Foo has_many :bars, :foreign_key => ''whatever_id'' In your case if the key is ca_customs_shipment_id then you should not need it on the has_many. 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.