Help. I cannot find any help by searching...
I''m slowly creating an application using tutorial examples, etc, but I
think I''m missing something real basic:
Here''s the error message:
NameError in Mindreadr#display_images_from_mindreadr
undefined local variable or method `mindreadr_open_socket'' for
#<#<Class:0x37c3b08>:0x37c3a30>
Here are what I think are the key files:
display_images_from_mindreadr.rhtml (The "<%=" is the source of the
error)
<!-- This is eventually just an html fragment -->
I need to Open a Socket to MindReadr
<%= mindreadr_open_socket %>
Then Request some images
Then display the images
(without the <%= line, I get the other lines as text as I expected)
mindreadr_open_socket (I don''t think this is the problem...never gets
here...if you can see a problem with this code, let me know!)
<!-- This is to create a connection to MindReader server -->
<!-- Right now the code doesn''t matter, because I cannot -->
<!-- get this section of code even called. -->
require "socket"
STDOUT.flush
s = TCPSocket.open("192.168.107.10", 9000)
result = "MindReadr Request called"
mindreadr_controller.rb (mindreader_open_socket is defined here)
class MindreadrController < ApplicationController
def index
end
def display_images_from_mindreadr
# Basic action which calls _open_socket, _request, and _read
render(:layout => false)
end
def mindreadr_open_socket
# Connect to MindReader server/port
render(:layout => false)
end
def mindreadr_request
# Ask MindReadr for some images
render(:layout => false)
end
def mindreadr_read
# Read output from MindReadr
render(:layout => false)
end
def ajax_example
render(:layout => false)
end
index.rhtml (partial- this all works fine until I hit the action button)
<!-- Section that displays images -->
<div id="mindreadrread_results">The images should go
here
after clicking "click here"</div>
<%= link_to_remote("Click here for images for images to appear
above",
:update => ''mindreadrread_results'',
:url => { :action =>
:display_images_from_mindreadr }) %>
Something tells me I haven''t declared something in the right place.
Suggestions for debugging?
Thanks,
Dave
--
Posted via http://www.ruby-forum.com/.
Your error is saying that the variable (mindreadr_open_socket) you''re using is not set so when you try to display it it says that there is a "undefiined local variable or method" You should also use: @mindreadr_open_socket I''m not sure if this is convention or necessary but I''d do it :) As a quick test just add: @mindreadr_open_socket = ''hello world'' as the first line in your "def display_images_from_mindreadr" method. Don''t forget to update your code to: <%= @mindreadr_open_socket %> in the rhtml - Byron On 2/13/06, David T-L <dtl@stanfordalumni.org> wrote:> > Help. I cannot find any help by searching... > > I''m slowly creating an application using tutorial examples, etc, but I > think I''m missing something real basic: > > Here''s the error message: > NameError in Mindreadr#display_images_from_mindreadr > undefined local variable or method `mindreadr_open_socket'' for > #<#<Class:0x37c3b08>:0x37c3a30> > > Here are what I think are the key files: > > display_images_from_mindreadr.rhtml (The "<%=" is the source of the > error) > <!-- This is eventually just an html fragment --> > I need to Open a Socket to MindReadr > <%= mindreadr_open_socket %> > Then Request some images > Then display the images > (without the <%= line, I get the other lines as text as I expected) > > mindreadr_open_socket (I don''t think this is the problem...never gets > here...if you can see a problem with this code, let me know!) > <!-- This is to create a connection to MindReader server --> > <!-- Right now the code doesn''t matter, because I cannot --> > <!-- get this section of code even called. --> > require "socket" > STDOUT.flush > s = TCPSocket.open("192.168.107.10", 9000) > result = "MindReadr Request called" > > > > mindreadr_controller.rb (mindreader_open_socket is defined here) > class MindreadrController < ApplicationController > def index > end > > def display_images_from_mindreadr > # Basic action which calls _open_socket, _request, and _read > render(:layout => false) > end > > def mindreadr_open_socket > # Connect to MindReader server/port > render(:layout => false) > end > > def mindreadr_request > # Ask MindReadr for some images > render(:layout => false) > end > > def mindreadr_read > # Read output from MindReadr > render(:layout => false) > end > > def ajax_example > render(:layout => false) > end > > > index.rhtml (partial- this all works fine until I hit the action button) > <!-- Section that displays images --> > <div id="mindreadrread_results">The images should go here > after clicking "click here"</div> > <%= link_to_remote("Click here for images for images to appear > above", > :update => ''mindreadrread_results'', > :url => { :action => > :display_images_from_mindreadr }) %> > > > Something tells me I haven''t declared something in the right place. > Suggestions for debugging? > > Thanks, > Dave > > -- > Posted via http://www.ruby-forum.com/. > _______________________________________________ > Rails mailing list > Rails@lists.rubyonrails.org > http://lists.rubyonrails.org/mailman/listinfo/rails >-- Byron http://byron.saltysiak.com -------------- next part -------------- An HTML attachment was scrubbed... URL: http://wrath.rubyonrails.org/pipermail/rails/attachments/20060214/3db6335d/attachment.html
David T-L wrote:> display_images_from_mindreadr.rhtml (The "<%=" is the source of the > error) > <!-- This is eventually just an html fragment --> > I need to Open a Socket to MindReadr > <%= mindreadr_open_socket %> > Then Request some images > Then display the images > (without the <%= line, I get the other lines as text as I expected) >Are you trying to call the controller.mindreadr_open_socket method from the view ? I don''t think that will work. I think, however, if you move that method to the helper, it can be called from the view. Also, unless the method returns a string that you want displayed, you need to use <% %> rather than <%= %> It may be you want something more like something more like: --- in the helper --- def mindreadr_open_socket socket = create__and_open_the_socket_somehow end ---in the view--- <% socketthing = mindreadr_open_socket %> ...blah blah... <% for blah %> <%= socketthing.get_data %> <% end %> <% sockething.close %> --------------------- -- Posted via http://www.ruby-forum.com/.
Byron, Thank you. That made the error message go away. I see I have to initialize the variable. However, I really thought I was constructing an action. So I think I have a deeper problem. Dave Byron Saltysiak wrote:> Your error is saying that the variable (mindreadr_open_socket) you''re > using > is not set so when you try to display it it says that there is a > "undefiined > local variable or method" > > You should also use: @mindreadr_open_socket > > I''m not sure if this is convention or necessary but I''d do it :) > > As a quick test just add: > @mindreadr_open_socket = ''hello world'' > > as the first line in your "def display_images_from_mindreadr" method. > > Don''t forget to update your code to: > > <%= @mindreadr_open_socket %> in the rhtml > > - Byron-- Posted via http://www.ruby-forum.com/.
Alan, I think you are exactly right. I still don''t understand all of the scafolding interconnectedness. Thanks for giving me such a complete answer. I need to study it and give it a try. Thanks for taking the time to "solve" my real problem. Dave Alan Francis wrote:> David T-L wrote: > >> display_images_from_mindreadr.rhtml (The "<%=" is the source of the >> error) >> <!-- This is eventually just an html fragment --> >> I need to Open a Socket to MindReadr >> <%= mindreadr_open_socket %> >> Then Request some images >> Then display the images >> (without the <%= line, I get the other lines as text as I expected) >> > > Are you trying to call the controller.mindreadr_open_socket method from > the view ? I don''t think that will work. I think, however, if you > move that method to the helper, it can be called from the view. > > Also, unless the method returns a string that you want displayed, you > need to use <% %> rather than <%= %> > > It may be you want something more like something more like: > > --- in the helper --- > > def mindreadr_open_socket > socket = create__and_open_the_socket_somehow > end > > ---in the view--- > > <% socketthing = mindreadr_open_socket %> > > ...blah blah... > <% for blah %> > <%= socketthing.get_data %> > <% end %> > > <% sockething.close %> > ----------------------- Posted via http://www.ruby-forum.com/.