hello thank you for your reply i will explain to you a little more the problem :
i created a scafold : ./script/generate scaffold Zone name:string interface:string description:string all works fine . than i changed <%= f.text_field :interface %> to <%= f.select :interface , @table_Interfaces %> @table_interfaces is an array witch contains all network interface in the linux machine . in my controller i have : @interfaces=%x[ifconfig|grep Link|cut -d " " -f 1] @[email protected](" ") and at this step all works fine . i can make all the operation on my object Zone. then i wanted to make some validation in the model . i aded this in my model file Zone.rb : class Zone < ActiveRecord::Base validates_presence_of :name end Now when i want to create a new zone : if i enter all the attribute it works fine . if i don't enter the name i have this error : Showing app/views/zones/new.html.erb where line #12 raised: You have a nil object when you didn't expect it! You might have expected an instance of Array. The error occurred while evaluating nil.inject Extracted source (around line #12): <%= f.select :interface , @table_Interfaces %> witch mean that the model don't know the object @table_Interfaces witch is declared only on the controller no ? should I add something in my model file related to @table_Interfaces ? thank you very much for your help . i am a newbie in ROR world but i have searched a lot without result . On 20 jan, 09:29, Colin Law <[email protected]> wrote: > On 19 January 2011 23:58, abdelkrim fitouri <[email protected]> wrote: > > > > > hello every body ! > > > i have a little problem > > > i have created a scaffold Zone witch contain : name , interface and > > description as attribute > > > all works fine but when i add this line to my model : > > > class Zone < ActiveRecord::Base > > > validates_presence_of :name, :message => "Missing name " > > > end > > > i have an error when the name is empty ! > > > this is the error : > > > You have a nil object when you didn't expect it! > > You might have expected an instance of Array. > > The error occurred while evaluating nil.inject > > Look carefully at the error and if necessary the stack trace and you > should find an indication of where it is failing in your code. Look > at that line and you will likely find a call of inject, the error is > telling you that the object you are calling inject on is nil. > > Colin > > > > > any help please i have searched a lot but i don't found any solution :( > > have i forgot any step ? > > > thanks a lot > > > -- > > Cordialement > > Abdelkarim Fitouri > > Membre Securinets :http://www.securinets.com > > Élève ingénieur . > > Technicien Réseaux et Systèmes : Agence Universitaire de la Francophonie > > (AUF) > > Cnf Tunis . > > > -- > > 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 [email protected]. > > To unsubscribe from this group, send email to > > [email protected]. > > 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 [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.
