I am still somewhat new to rails and I am not getting the results I am
expecting with my models.. perhapse I do not understand something, or
just didn''t set something up right.
I have three models:
class Coordinator < ActiveRecord::Base
belongs_to :county
belongs_to :state
end
class State < ActiveRecord::Base
has_many :counties
has_many :coordinators, :through => :counties
accepts_nested_attributes_for :counties, :coordinators
end
class County < ActiveRecord::Base
belongs_to :state
has_one :coordinator
accepts_nested_attributes_for :coordinator
scope :returncounty, lambda {|state| where(:state_id => state)}
end
When I try and do something like this in my view
<% @states.each do |state| %>
<% state.counties.each do |county| %>
<p><%= county.name %> <%= county.coordinator.name %></p>
<% end %>
<% end %>
I am getting:this error. I have tried several variations on this
theme.. so I feel like I am stuck in my understanding of how rails
associations work. Can someone point me in the right direction?
undefined method `name'' for "#<Coordinator:
0x00000003a83128>":Coordinator
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On 26 May 2011 07:07, Aaron Mills <aaron-Q5vuKM0lUFF2nkLVYnoq1mXnswh1EIUO@public.gmane.org> wrote:> I am getting:this error. I have tried several variations on this > theme.. so I feel like I am stuck in my understanding of how rails > associations work. Can someone point me in the right direction? > undefined method `name'' for "#<Coordinator: > 0x00000003a83128>":CoordinatorThat''s a fairly straightforward, self-explanatory error, that''s got nothing to do with associations. It''s telling you that Coordinator has no method "name". Have you created and run a migration to add a field called "name" to that table? Can you check in your DB management tool to check the field is there. Can you open a console and execute "Coordinator.new" (or just "Coordinator") and see the list of available attributes/field names. Let us know the result. Regards, -- 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 26 May 2011 07:07, Aaron Mills <aaron-Q5vuKM0lUFF2nkLVYnoq1mXnswh1EIUO@public.gmane.org> wrote:> I am still somewhat new to rails and I am not getting the results I am > expecting with my models.. perhapse I do not understand something, or > just didn''t set something up right. > > I have three models: > > class Coordinator < ActiveRecord::Base > belongs_to :county > belongs_to :state > end > > class State < ActiveRecord::Base > has_many :counties > has_many :coordinators, :through => :counties > accepts_nested_attributes_for :counties, :coordinators > end > > class County < ActiveRecord::Base > belongs_to :state > has_one :coordinator > accepts_nested_attributes_for :coordinator > scope :returncounty, lambda {|state| where(:state_id => state)} > endProbably not associated with your problem but there is something not right above, you have two routes to coordinator from state. You have coordinator belongs to state (implying coordinator has a state_id column) and so you should also have state has many coordinators (which you have not specified). You also have coordinator belongs to county and county has one coordinator, but then in state you also have state belongs_to county and state has_many coordinators through counties. So when you say @state.coordinators it will get the coordinators from the counties, in which case you should not have coordinator belongs to state. 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.
Woops in all my changes I put name instead of firstname on my coordinators.. This is now correct but the original issue is still there.. which is when I try and call state.county.name or coordinator.state.name or county.state.name. I am quite sure that county.name exists and that state.name exists. I ran some commands in the console, here is what I get: examplestate = State.find(1) => #<State id: 1, name: "Alabama", abreviation: "AL", created_at: "2011-04-04 16:32:08", updated_at: "2011-04-04 16:32:08"> examplestate.name => "Alabama" examplecounties = examplestate.counties => [#<County id: 3, name: "Baldwin County", state_id: 1, created_at: "2011-04-04 16:32:32", updated_at: "2011-04-04 16:32:32">, #<County id: 4, name: "Cherokee County", state_id: 1, created_at: "2011-04-04 16:32:32", updated_at: "2011-04-04 16:32:32">, #<County id: 5, name: "Chilton County", state_id: 1, created_at: "2011-04-04 16:32:33", updated_at: "2011-04-04 16:32:33">, #<County id: 6, name: "Clarke County", state_id: 1, created_at: "2011-04-04 16:32:33", updated_at: "2011-04-04 16:32:33">, #<County id: 7, name: "Colbert County", state_id: 1, created_at: "2011-04-04 16:32:33", updated_at: "2011-04-04 16:32:33">, #<County id: 8, name: "Crenshaw County", state_id: 1, created_at: "2011-04-04 16:32:33", updated_at: "2011-04-04 16:32:33">, #<County id: 9, name: "Cullman County", state_id: 1, created_at: "2011-04-04 16:32:33", updated_at: "2011-04-04 16:32:33">, #<County id: 10, name: "DeKalb County", state_id: 1, created_at: "2011-04-04 16:32:33", updated_at: "2011-04-04 16:32:33">,etc.. etc.. examplecounties.each do |county| puts county.coordinator.firstname end Jessica Ron P. Dale Gerry Garry Tami Samuel etc. etc. So when I call a coordinators firstname from a county, from a state.. it seems to work.. but then when I try that in the view for instance: My state controller calls @state.all and in the state index view I have: <% @states.each do |state| %> <strong><%= state.name %></strong> <% state.counties.each do |county| %> <p><%= county.coordinator.firstname %> </p> <% end %> <% end %> I get this error: undefined method `firstname'' for nil:NilClass On May 26, 3:42 am, Michael Pavling <pavl...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:> On 26 May 2011 07:07, Aaron Mills <aa...-Q5vuKM0lUFF2nkLVYnoq1mXnswh1EIUO@public.gmane.org> wrote: > > > I am getting:this error. I have tried several variations on this > > theme.. so I feel like I am stuck in my understanding of how rails > > associations work. Can someone point me in the right direction? > > undefined method `name'' for "#<Coordinator: > > 0x00000003a83128>":Coordinator > > That''s a fairly straightforward, self-explanatory error, that''s got > nothing to do with associations. > It''s telling you that Coordinator has no method "name". Have you > created and run a migration to add a field called "name" to that > table? Can you check in your DB management tool to check the field is > there. Can you open a console and execute "Coordinator.new" (or just > "Coordinator") and see the list of available attributes/field names. > > Let us know the result. > Regards,-- 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.
As another example I can also put in the same view: <% @states.each do |state| %> <% state.coordinators.each do |coordinator| %> <p><%= coordinator.county.name %> </p> <% end %> <% end %> and I get undefined method `name'' for nil:NilClass On May 26, 10:09 am, Aaron Mills <aa...-Q5vuKM0lUFF2nkLVYnoq1mXnswh1EIUO@public.gmane.org> wrote:> Woops in all my changes I put name instead of firstname on my > coordinators.. This is now correct but the original issue is still > there.. which is when I try and call state.county.name or > coordinator.state.name or county.state.name. > > I am quite sure that county.name exists and that state.name exists. > > I ran some commands in the console, here is what I get: > > examplestate = State.find(1) > => #<State id: 1, name: "Alabama", abreviation: "AL", created_at: > "2011-04-04 16:32:08", updated_at: "2011-04-04 16:32:08"> > > examplestate.name > => "Alabama" > > examplecounties = examplestate.counties > => [#<County id: 3, name: "Baldwin County", state_id: 1, created_at: > "2011-04-04 16:32:32", updated_at: "2011-04-04 16:32:32">, #<County > id: 4, name: "Cherokee County", state_id: 1, created_at: "2011-04-04 > 16:32:32", updated_at: "2011-04-04 16:32:32">, #<County id: 5, name: > "Chilton County", state_id: 1, created_at: "2011-04-04 16:32:33", > updated_at: "2011-04-04 16:32:33">, #<County id: 6, name: "Clarke > County", state_id: 1, created_at: "2011-04-04 16:32:33", updated_at: > "2011-04-04 16:32:33">, #<County id: 7, name: "Colbert County", > state_id: 1, created_at: "2011-04-04 16:32:33", updated_at: > "2011-04-04 16:32:33">, #<County id: 8, name: "Crenshaw County", > state_id: 1, created_at: "2011-04-04 16:32:33", updated_at: > "2011-04-04 16:32:33">, #<County id: 9, name: "Cullman County", > state_id: 1, created_at: "2011-04-04 16:32:33", updated_at: > "2011-04-04 16:32:33">, #<County id: 10, name: "DeKalb County", > state_id: 1, created_at: "2011-04-04 16:32:33", updated_at: > "2011-04-04 16:32:33">,etc.. etc.. > > examplecounties.each do |county| > puts county.coordinator.firstname > end > > Jessica > Ron > P. Dale > Gerry > Garry > Tami > Samuel > etc. etc. > > So when I call a coordinators firstname from a county, from a state.. > it seems to work.. but then when I try that in the view for instance: > > My state controller calls @state.all > > and in the state index view I have: > > <% @states.each do |state| %> > <strong><%= state.name %></strong> > <% state.counties.each do |county| %> > <p><%= county.coordinator.firstname %> </p> > <% end %> > <% end %> > > I get this error: > undefined method `firstname'' for nil:NilClass > > On May 26, 3:42 am, Michael Pavling <pavl...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote: > > > > > > > > > On 26 May 2011 07:07, Aaron Mills <aa...-Q5vuKM0lUFF2nkLVYnoq1mXnswh1EIUO@public.gmane.org> wrote: > > > > I am getting:this error. I have tried several variations on this > > > theme.. so I feel like I am stuck in my understanding of how rails > > > associations work. Can someone point me in the right direction? > > > undefined method `name'' for "#<Coordinator: > > > 0x00000003a83128>":Coordinator > > > That''s a fairly straightforward, self-explanatory error, that''s got > > nothing to do with associations. > > It''s telling you that Coordinator has no method "name". Have you > > created and run a migration to add a field called "name" to that > > table? Can you check in your DB management tool to check the field is > > there. Can you open a console and execute "Coordinator.new" (or just > > "Coordinator") and see the list of available attributes/field names. > > > Let us know the result. > > Regards,-- 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.
On 26 May 2011 15:09, Aaron Mills <aaron-Q5vuKM0lUFF2nkLVYnoq1mXnswh1EIUO@public.gmane.org> wrote:> This is now correct but the original issue is still > there.. which is when I try and call state.county.name or > coordinator.state.name or county.state.name. > > I get this error: > undefined method `firstname'' for nil:NilClassThat''s a *different* error to what you had before. That''s telling you that the thing you''re trying to call ".firstname" on is nil. ie: there is no coordinator for the given county. You can guard against this error any number of ways, an easy one being: <%= county.coordinator.firstname if county.coordinator %> -- 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.
Great.. I knew it had to be something so simple.. You helped me get past the brick wall! I had not even considered that nearly 70% of my counties have no coordinator!!!! DOH! thanks for your help On May 26, 10:13 am, Michael Pavling <pavl...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:> On 26 May 2011 15:09, Aaron Mills <aa...-Q5vuKM0lUFF2nkLVYnoq1mXnswh1EIUO@public.gmane.org> wrote: > > > This is now correct but the original issue is still > > there.. which is when I try and call state.county.name or > > coordinator.state.name or county.state.name. > > > I get this error: > > undefined method `firstname'' for nil:NilClass > > That''s a *different* error to what you had before. > That''s telling you that the thing you''re trying to call ".firstname" > on is nil. ie: there is no coordinator for the given county. > > You can guard against this error any number of ways, an easy one being: > <%= county.coordinator.firstname if county.coordinator %>-- 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.