On 21 January 2011 21:22, abdelkarim <[email protected]> wrote: > hello thank you for your reply
Please don't top post, it makes it difficult to follow the thread. Insert your reply at appropriate points in previous message. Thanks > > 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](" ") I suggest you use ruby-debug to break in here and inspect the variables to see what is going on. Have a look at the Rails Guide on debugging to find out how. Also have you tried running the code above in the ruby console to see what it generates? A secondary issue, but the rails convention for naming is @table_interfaces (all lower case). If you stick to the rails conventions your life will generally be simpler. Colin > > 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. > > -- 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.
