Rendering simple html from view/controller

Rails
1

I start apologies for the silly question…but:
how do I show the content of a view in a controller by url I mean why,
with the starting rails conf and I simple scaffold done, i can’t do
root/:controller/:action and see the action.html.erb content?
it warns me writing
“Couldn’t find Product with ID=new2”
where new2 is an empty method in the controller and with a
new2.html.erb file existing in the view/controller_name folder

I had my guess…but I’d like to better understand how to do this… I
mean…is this about the routes.rb configuration? or there’s a way to
fill the method, don’t know some particular use of respond_to ?!

I know it’s a really stupid question…but still can’t figure out how
this work.
thanks since now :slight_smile:

andrea

2

Andrea,

You need to provide us with more information. From the info you have
given I cannot figure out what is going on.

“Couldn’t find Product with ID=new2”

You say that you have an empty method, but it is trying to find a
Product with ID=new2. I think that it cannot find the correct route from
the routes.rb file.

Actually you should paste all the code snippets from your controller,
view and routes.rb file.

Punit

3

Ok…so that’s what I mean:

I need to create a new view where I want to insert for istance (and in
this exact case) a form that I use to upload a file and then process
the file.
So in first place I create a view “new2.html.erb” in my view folder
associated to a controller let’s say “references” with a form in it.
so now i have in the “view/references” folder this new file

how can I access this view? can I without creating a method? I guess I
don’t because when I type http://localhost:3000/references/new2 i get
that error:
“Couldn’t find Reference with ID=new2”
(but it render the page with the form if I had any kind of id after,
i.e. http://localhost:3000/references/new2/1 )

the question is: why for istance the “index” page or the “new”
generated by the scaffold can render the page (and the form in case of
new) without passing any ID and I can’t now? what’s the rule
underneath?

my new2.html.erb page contain this:

New reference csv

<% form_for :reference, @references, :method => :get, :url => {:action => 'new'} do %>

Filename: <%= text_field_tag "file_tag" %>

<%= submit_tag("Carica csv") %>

<% end %> <%= link_to 'Back', references_path %> -- (I've redefined the new method to parse a csv file)

and the routes.rb is the default one given by rails with the only
restful defined like this:

map.connect ‘:controller/:action/:id’
map.connect ‘:controller/:action/:id.:format’

I’ve tried to add something like:
map.connect ‘:controller/:action.:format’

but it does not do the trick … :smiley:

I’d like to understand how this work in general more than solve this
particular problem :slight_smile:

thank u all :slight_smile:
andrea

4

right!
thx for reply…
I’m going to read a basic restful/routes guide
I guess it’s something dealing with GET or POST method
thx :slight_smile:

5

Andrea,

how can I access this view? can I without creating a method? I guess I
don’t because when I type http://localhost:3000/references/new2 i get
that error:
“Couldn’t find Reference with ID=new2”
(but it render the page with the form if I had any kind of id after,
i.e. http://localhost:3000/references/new2/1 )

You routes.rb file would also have this line.
map.resources :references

What this does is that it creates RESTful urls for references. You
should read up on restful routes.

Since the routes.rb files is read top-down, the RESTful url for
references gets more priority over map.connect
‘:controller/:action/:id’

So maybe you should add a named route for your new2 method(and make sure
its before the map.resources line in your routes.rb) or another
controller to handle uploading of files.

Punit

6

I meant GET or POST request :wink:

7

just add
map.resources :referenced , :collection => { ‘new2’ => ‘get’ }

8

On 12 March 2010 13:40, adedip [email protected] wrote:

right!
thx for reply…
I’m going to read a basic restful/routes guide

In case you have not seem there there are excellent guides at
http://guides.rubyonrails.org/ including one on routing. I would
suggest starting with Getting Started however which will explain the
basic principles of rails, then work through the others.

Colin

9

Hi guys…I did try almost everything…but still cant’ get any result…

Starting from a simple “scaffold” creating a class called “reference”
I have updated the controller with this 2 methods:

def load

end

def upload
require ‘fastercsv’
filename = params[:file_tag]
FasterCSV.foreach(“public/trac/#{filename}”, {:col_sep => “;”} )
do |row|
Reference.create(:idarticolo => row[0], :nomefilefoto => row[1],
:cancellato => row[2] )
end

respond_to do |format|
  format.html # new.html.erb
  format.xml  { render :xml => @reference }
end

end

the I’ve added a view file in the “app/view/reference” folder called
“load.html.erb”
with this code:

–

New reference

<% form_for :reference, @references, :method => :get, :url => {:action => 'upload'} do %>

Filename: <%= text_field_tag "file_tag" %>

<%= submit_tag("Load csv") %>

<% end %> <%= link_to 'Back', references_path %> --

then I’ve updated the routes.rb file with this line (do I have to
replace the already in “map.resources :references” or do i add this
second new line?):

map.resources :references, :collection => {“load” => “get”}

going to url: http://localhost:3000/references/load I get this error
message:

ActiveRecord::RecordNotFound in ReferencesController#show

Couldn’t find Reference with ID=load

RAILS_ROOT: /Users/adedip/Lavoro/antonioli1
Application Trace | Framework Trace | Full Trace

/Library/Ruby/Gems/1.8/gems/activerecord-2.3.5/lib/active_record/
base.rb:1586:in find_one' /Library/Ruby/Gems/1.8/gems/activerecord-2.3.5/lib/active_record/ base.rb:1569:in find_from_ids’
/Library/Ruby/Gems/1.8/gems/activerecord-2.3.5/lib/active_record/
base.rb:616:in find' /Users/adedip/Lavoro/antonioli1/app/controllers/ references_controller.rb:25:in show’
/Library/Ruby/Gems/1.8/gems/actionpack-2.3.5/lib/action_controller/
base.rb:1331:in send' /Library/Ruby/Gems/1.8/gems/actionpack-2.3.5/lib/action_controller/ base.rb:1331:in perform_action_without_filters’
/Library/Ruby/Gems/1.8/gems/actionpack-2.3.5/lib/action_controller/
filters.rb:617:in call_filters' /Library/Ruby/Gems/1.8/gems/actionpack-2.3.5/lib/action_controller/ filters.rb:610:in perform_action_without_benchmark’
/Library/Ruby/Gems/1.8/gems/actionpack-2.3.5/lib/action_controller/
benchmarking.rb:68:in perform_action_without_rescue' /Library/Ruby/Gems/1.8/gems/activesupport-2.3.5/lib/active_support/ core_ext/benchmark.rb:17:in ms’
/Library/Ruby/Gems/1.8/gems/activesupport-2.3.5/lib/active_support/
core_ext/benchmark.rb:17:in ms' /Library/Ruby/Gems/1.8/gems/actionpack-2.3.5/lib/action_controller/ benchmarking.rb:68:in perform_action_without_rescue’
/Library/Ruby/Gems/1.8/gems/actionpack-2.3.5/lib/action_controller/
rescue.rb:160:in perform_action_without_flash' /Library/Ruby/Gems/1.8/gems/actionpack-2.3.5/lib/action_controller/ flash.rb:146:in perform_action’
/Library/Ruby/Gems/1.8/gems/actionpack-2.3.5/lib/action_controller/
base.rb:532:in send' /Library/Ruby/Gems/1.8/gems/actionpack-2.3.5/lib/action_controller/ base.rb:532:in process_without_filters’
/Library/Ruby/Gems/1.8/gems/actionpack-2.3.5/lib/action_controller/
filters.rb:606:in process' /Library/Ruby/Gems/1.8/gems/actionpack-2.3.5/lib/action_controller/ base.rb:391:in process’
/Library/Ruby/Gems/1.8/gems/actionpack-2.3.5/lib/action_controller/
base.rb:386:in call' /Library/Ruby/Gems/1.8/gems/actionpack-2.3.5/lib/action_controller/ routing/route_set.rb:437:in call’

If I add any number at the end of the url it works perfectly (i.e.
http://localhost:3000/references/load/1 )

what am I doing wrong?
can someone explain me the process to get this work? thanks in
advance :slight_smile:

Andrea

10

I guess is something dealing with this:
attr_accessor :name

isn’t it?

11

then I’ve updated the routes.rb file with this line (do I have to
replace the already in “map.resources :references” or do i add this
second new line?):

map.resources :references, :collection => {“load” => “get”}

You have to replace the line.