i get an error message ''you might have expexted an instance of Array,
error occurred while evaluating nil
i have created @selected_team = Array.new in a previous def that has
been called.
if i put @selected_team in the def below, it works but it also zeros
all the data each time it is called.
am i missing something basic here. arn''t instance variable available
thru all def in a controller as well as the views?
the instance variable is working in the view via partial!
def roster_selection
if params[:cvalue]
@selected_team << [ params[:full_name], params[:user_id] ]
else
# take out name
end
render :partial => "selected"
end
--~--~---------~--~----~------------~-------~--~----~
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On 18 Apr 2008, at 23:13, rushnosh wrote:> > i get an error message ''you might have expexted an instance of Array, > error occurred while evaluating nil > > i have created @selected_team = Array.new in a previous def that has > been called. > if i put @selected_team in the def below, it works but it also zeros > all the data each time it is called. > am i missing something basic here. arn''t instance variable available > thru all def in a controller as well as the views? > the instance variable is working in the view via partial! >I think you''re going to have to show us a little more than this. Fred> def roster_selection > if params[:cvalue] > @selected_team << [ params[:full_name], params[:user_id] ] > else > # take out name > end > render :partial => "selected" > end > > > >--~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
def show
@club = Club.find params[:id]
rosternew(@club.id, params[:sort_by] )
@selected_team = Array.new # @selected_array
variable.
end
everything works well.
i have a onclick on a checkbox, when clicked it calls
roster_selection, the name and the user_id is passed and i can see
them in the logs.
but i get a nil error when @selected_array << [ x , y] as in the
code.
if i directly put @selected = Array.new in the def called everything
runs but of course my array is initialized and contains only one name.
let me know if there is something specific you need to see. i have
even tried rjs, but i have now narrowed that out as well because the
error is the same.
i can not fill this array for some reason.
On Apr 18, 3:54 pm, Frederick Cheung
<frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:> On 18 Apr 2008, at 23:13, rushnosh wrote:
>
>
>
> > i get an error message ''you might have expexted an instance
of Array,
> > error occurred while evaluating nil
>
> > i have created @selected_team = Array.new in a previous def that has
> > been called.
> > if i put @selected_team in the def below, it works but it also zeros
> > all the data each time it is called.
> > am i missing something basic here. arn''t instance variable
available
> > thru all def in a controller as well as the views?
> > the instance variable is working in the view via partial!
>
> I think you''re going to have to show us a little more than this.
>
> Fred
>
> > def roster_selection
> > if params[:cvalue]
> > @selected_team << [ params[:full_name], params[:user_id] ]
> > else
> > # take out name
> > end
> > render :partial => "selected"
> > end
--~--~---------~--~----~------------~-------~--~----~
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To post to this group, send email to
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-~----------~----~----~----~------~----~------~--~---
On 19 Apr 2008, at 00:59, rushnosh wrote:> > def show > @club = Club.find params[:id] > rosternew(@club.id, params[:sort_by] ) > @selected_team = Array.new # @selected_array > variable. > end > > everything works well. > i have a onclick on a checkbox, when clicked it calls > roster_selection, the name and the user_id is passed and i can see > them in the logs. > but i get a nil error when @selected_array << [ x , y] as in the > code.That''s because each action is handled by a separate controller instance (which could be in a separate mongrel, or even on a different machine if your app is deployed across multiple machines). setting an instance variable in your show action has no effect on whether what exists when your roster_selection action is called. Fred> > > if i directly put @selected = Array.new in the def called everything > runs but of course my array is initialized and contains only one name. > let me know if there is something specific you need to see. i have > even tried rjs, but i have now narrowed that out as well because the > error is the same. > i can not fill this array for some reason. > > On Apr 18, 3:54 pm, Frederick Cheung <frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> > wrote: >> On 18 Apr 2008, at 23:13, rushnosh wrote: >> >> >> >>> i get an error message ''you might have expexted an instance of >>> Array, >>> error occurred while evaluating nil >> >>> i have created @selected_team = Array.new in a previous def that has >>> been called. >>> if i put @selected_team in the def below, it works but it also zeros >>> all the data each time it is called. >>> am i missing something basic here. arn''t instance variable available >>> thru all def in a controller as well as the views? >>> the instance variable is working in the view via partial! >> >> I think you''re going to have to show us a little more than this. >> >> Fred >> >>> def roster_selection >>> if params[:cvalue] >>> @selected_team << [ params[:full_name], params[:user_id] ] >>> else >>> # take out name >>> end >>> render :partial => "selected" >>> end > >--~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
> That''s because each action is handled by a separate controller > instance (which could be in a separate mongrel, or even on a different > machine if your app is deployed across multiple machines). setting an > instance variable in your show action has no effect on whether what > exists when your roster_selection action is called.i read this a couple of times, both def are in the same controller. both actions as you refer to it. i even tried this inside the view <%= @team << [ ''hello'', ''goodbye''] same error message. i am going to look a little bit closer at the local variable in partials. i have a feeling it has something to do with that. this is a trivial problem so i can''t believe that it can not be done in ruby using javascript/ajax. On Apr 18, 5:09 pm, Frederick Cheung <frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:> On 19 Apr 2008, at 00:59, rushnosh wrote: > > > > > def show > > @club = Club.find params[:id] > > rosternew(@club.id, params[:sort_by] ) > > @selected_team = Array.new # @selected_array > > variable. > > end > > > everything works well. > > i have a onclick on a checkbox, when clicked it calls > > roster_selection, the name and the user_id is passed and i can see > > them in the logs. > > but i get a nil error when @selected_array << [ x , y] as in the > > code. > > That''s because each action is handled by a separate controller > instance (which could be in a separate mongrel, or even on a different > machine if your app is deployed across multiple machines). setting an > instance variable in your show action has no effect on whether what > exists when your roster_selection action is called. > > Fred > > > > > if i directly put @selected = Array.new in the def called everything > > runs but of course my array is initialized and contains only one name. > > let me know if there is something specific you need to see. i have > > even tried rjs, but i have now narrowed that out as well because the > > error is the same. > > i can not fill this array for some reason. > > > On Apr 18, 3:54 pm, Frederick Cheung <frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> > > wrote: > >> On 18 Apr 2008, at 23:13, rushnosh wrote: > > >>> i get an error message ''you might have expexted an instance of > >>> Array, > >>> error occurred while evaluating nil > > >>> i have created @selected_team = Array.new in a previous def that has > >>> been called. > >>> if i put @selected_team in the def below, it works but it also zeros > >>> all the data each time it is called. > >>> am i missing something basic here. arn''t instance variable available > >>> thru all def in a controller as well as the views? > >>> the instance variable is working in the view via partial! > > >> I think you''re going to have to show us a little more than this. > > >> Fred > > >>> def roster_selection > >>> if params[:cvalue] > >>> @selected_team << [ params[:full_name], params[:user_id] ] > >>> else > >>> # take out name > >>> end > >>> render :partial => "selected" > >>> end--~--~---------~--~----~------------~-------~--~----~ 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@googlegroups.com For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
On 19 Apr 2008, at 01:36, rushnosh wrote:> >> That''s because each action is handled by a separate controller >> instance (which could be in a separate mongrel, or even on a >> different >> machine if your app is deployed across multiple machines). setting an >> instance variable in your show action has no effect on whether what >> exists when your roster_selection action is called. > > i read this a couple of times, both def are in the same controller. > both actions as you refer to it. >The code runs in response to separate http requests (unless i''ve completely misunderstood your requests). Instance variables are not preserved across requests. Fred> i even tried this inside the view <%= @team << [ ''hello'', ''goodbye''] > same error message. > i am going to look a little bit closer at the local variable in > partials. i have a feeling it has something to do with that. > > this is a trivial problem so i can''t believe that it can not be done > in ruby using javascript/ajax. > > > On Apr 18, 5:09 pm, Frederick Cheung <frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> > wrote: >> On 19 Apr 2008, at 00:59, rushnosh wrote: >> >> >> >>> def show >>> @club = Club.find params[:id] >>> rosternew(@club.id, params[:sort_by] ) >>> @selected_team = Array.new # @selected_array >>> variable. >>> end >> >>> everything works well. >>> i have a onclick on a checkbox, when clicked it calls >>> roster_selection, the name and the user_id is passed and i can see >>> them in the logs. >>> but i get a nil error when @selected_array << [ x , y] as in the >>> code. >> >> That''s because each action is handled by a separate controller >> instance (which could be in a separate mongrel, or even on a >> different >> machine if your app is deployed across multiple machines). setting an >> instance variable in your show action has no effect on whether what >> exists when your roster_selection action is called. >> >> Fred >> >> >> >>> if i directly put @selected = Array.new in the def called >>> everything >>> runs but of course my array is initialized and contains only one >>> name. >>> let me know if there is something specific you need to see. i have >>> even tried rjs, but i have now narrowed that out as well because the >>> error is the same. >>> i can not fill this array for some reason. >> >>> On Apr 18, 3:54 pm, Frederick Cheung <frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> >>> wrote: >>>> On 18 Apr 2008, at 23:13, rushnosh wrote: >> >>>>> i get an error message ''you might have expexted an instance of >>>>> Array, >>>>> error occurred while evaluating nil >> >>>>> i have created @selected_team = Array.new in a previous def that >>>>> has >>>>> been called. >>>>> if i put @selected_team in the def below, it works but it also >>>>> zeros >>>>> all the data each time it is called. >>>>> am i missing something basic here. arn''t instance variable >>>>> available >>>>> thru all def in a controller as well as the views? >>>>> the instance variable is working in the view via partial! >> >>>> I think you''re going to have to show us a little more than this. >> >>>> Fred >> >>>>> def roster_selection >>>>> if params[:cvalue] >>>>> @selected_team << [ params[:full_name], params[:user_id] ] >>>>> else >>>>> # take out name >>>>> end >>>>> render :partial => "selected" >>>>> end > >--~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
fredirick, i don''t think i have explained my self. i have used instance variables across def without a problems. this has something to do with the call from javascript. i wanted the user to be able to click on a check box and that item appear in a div (and i need to keep track of the items selected). i think i will have to back to the old way doing this, user clicks all the check box wanted then press a button, then the items appear in a div. it would have been really nice to do this with ajax. i am missing something fundamental here. On Apr 18, 5:39 pm, Frederick Cheung <frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:> On 19 Apr 2008, at 01:36, rushnosh wrote: > > > > >> That''s because each action is handled by a separate controller > >> instance (which could be in a separate mongrel, or even on a > >> different > >> machine if your app is deployed across multiple machines). setting an > >> instance variable in your show action has no effect on whether what > >> exists when your roster_selection action is called. > > > i read this a couple of times, both def are in the same controller. > > both actions as you refer to it. > > The code runs in response to separate http requests (unless i''ve > completely misunderstood your requests). Instance variables are not > preserved across requests. > > Fred > > > i even tried this inside the view <%= @team << [ ''hello'', ''goodbye''] > > same error message. > > i am going to look a little bit closer at the local variable in > > partials. i have a feeling it has something to do with that. > > > this is a trivial problem so i can''t believe that it can not be done > > in ruby using javascript/ajax. > > > On Apr 18, 5:09 pm, Frederick Cheung <frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> > > wrote: > >> On 19 Apr 2008, at 00:59, rushnosh wrote: > > >>> def show > >>> @club = Club.find params[:id] > >>> rosternew(@club.id, params[:sort_by] ) > >>> @selected_team = Array.new # @selected_array > >>> variable. > >>> end > > >>> everything works well. > >>> i have a onclick on a checkbox, when clicked it calls > >>> roster_selection, the name and the user_id is passed and i can see > >>> them in the logs. > >>> but i get a nil error when @selected_array << [ x , y] as in the > >>> code. > > >> That''s because each action is handled by a separate controller > >> instance (which could be in a separate mongrel, or even on a > >> different > >> machine if your app is deployed across multiple machines). setting an > >> instance variable in your show action has no effect on whether what > >> exists when your roster_selection action is called. > > >> Fred > > >>> if i directly put @selected = Array.new in the def called > >>> everything > >>> runs but of course my array is initialized and contains only one > >>> name. > >>> let me know if there is something specific you need to see. i have > >>> even tried rjs, but i have now narrowed that out as well because the > >>> error is the same. > >>> i can not fill this array for some reason. > > >>> On Apr 18, 3:54 pm, Frederick Cheung <frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> > >>> wrote: > >>>> On 18 Apr 2008, at 23:13, rushnosh wrote: > > >>>>> i get an error message ''you might have expexted an instance of > >>>>> Array, > >>>>> error occurred while evaluating nil > > >>>>> i have created @selected_team = Array.new in a previous def that > >>>>> has > >>>>> been called. > >>>>> if i put @selected_team in the def below, it works but it also > >>>>> zeros > >>>>> all the data each time it is called. > >>>>> am i missing something basic here. arn''t instance variable > >>>>> available > >>>>> thru all def in a controller as well as the views? > >>>>> the instance variable is working in the view via partial! > > >>>> I think you''re going to have to show us a little more than this. > > >>>> Fred > > >>>>> def roster_selection > >>>>> if params[:cvalue] > >>>>> @selected_team << [ params[:full_name], params[:user_id] ] > >>>>> else > >>>>> # take out name > >>>>> end > >>>>> render :partial => "selected" > >>>>> end--~--~---------~--~----~------------~-------~--~----~ 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@googlegroups.com For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
On 19 Apr 2008, at 01:56, rushnosh wrote:> > fredirick, i don''t think i have explained my self. i have used > instance variables across def without a problems. this has something > to do with the call from javascript. i wanted the user to be able to > click on a check box and that item appear in a div (and i need to keep > track of the items selected). > > i think i will have to back to the old way doing this, user clicks all > the check box wanted then press a button, then the items appear in a > div. > > it would have been really nice to do this with ajax. i am missing > something fundamental here. >I think you need to read up on some of your object oriented programming. Instance variables are specific to one instance (that''s why they''re called what they are). If you''ve got an instance then all the the methods of that object can see its instance variables (which is what underpins your " i have used instance variables across def"). However 2 different instances of an object have completely separate instance variables. The instance of controller that handles your show action and the one that handles your ajax request are different and thus cannot see each other''s instance variables. If you want to preserve state across requests then you need to stick it somewhere like the database, the session, or just manage it all client side Fred --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
On 19 Apr 2008, at 02:05, Frederick Cheung wrote:> > On 19 Apr 2008, at 01:56, rushnosh wrote: > >> >> fredirick, i don''t think i have explained my self. i have used >> instance variables across def without a problems. this has something >> to do with the call from javascript. i wanted the user to be able to >> click on a check box and that item appear in a div (and i need to >> keep >> track of the items selected). >> >> i think i will have to back to the old way doing this, user clicks >> all >> the check box wanted then press a button, then the items appear in a >> div. >> >> it would have been really nice to do this with ajax. i am missing >> something fundamental here. >> > I think you need to read up on some of your object oriented > programming. Instance variables are specific to one instance (that''s > why they''re called what they are). If you''ve got an instance then > all the the methods of that object can see its instance variables > (which is what underpins your " i have used instance variables > across def"). > > However 2 different instances of an object have completely separate > instance variables. The instance of controller that handles your > show action and the one that handles your ajax request are different > and thus cannot see each other''s instance variables. If you want to > preserve state across requests then you need to stick it somewhere > like the database, the session, or just manage it all client sideAll that said, an easier way here might be a Form observer that will send all of your checkboxes to your app whenever any of them are toggled Fred --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
thanks for your help. you cleared up a lot for me here. hopefully other newbies will gain from it as well. On Apr 18, 6:19 pm, Frederick Cheung <frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:> On 19 Apr 2008, at 02:05, Frederick Cheung wrote: > > > > > > > On 19 Apr 2008, at 01:56, rushnosh wrote: > > >> fredirick, i don''t think i have explained my self. i have used > >> instance variables across def without a problems. this has something > >> to do with the call from javascript. i wanted the user to be able to > >> click on a check box and that item appear in a div (and i need to > >> keep > >> track of the items selected). > > >> i think i will have to back to the old way doing this, user clicks > >> all > >> the check box wanted then press a button, then the items appear in a > >> div. > > >> it would have been really nice to do this with ajax. i am missing > >> something fundamental here. > > > I think you need to read up on some of your object oriented > > programming. Instance variables are specific to one instance (that''s > > why they''re called what they are). If you''ve got an instance then > > all the the methods of that object can see its instance variables > > (which is what underpins your " i have used instance variables > > across def"). > > > However 2 different instances of an object have completely separate > > instance variables. The instance of controller that handles your > > show action and the one that handles your ajax request are different > > and thus cannot see each other''s instance variables. If you want to > > preserve state across requests then you need to stick it somewhere > > like the database, the session, or just manage it all client side > > All that said, an easier way here might be a Form observer that will > send all of your checkboxes to your app whenever any of them are toggled > > Fred--~--~---------~--~----~------------~-------~--~----~ 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@googlegroups.com For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---