Rails - Feb 2011 - need help w/ MVC coding of simple use of FasterCSV

I''m new to ROR, so still getting used to the MVC syntax; but think I
have a
simple example here that I hope someone can tell me what I''m doing
wrong (&
maybe help someone else by doing so):

All I''m trying to do is upload a CSV file, then parse each row of data
in it
(the first how contains header data).

Here''s the essential part of my view:

<% form_tag ({:action => ''process_file''},
              :multipart => true) do %>
  <%= file_field_tag ''file'' %>
  <p>
    <%= submit_tag "Upload" %>
  </p>
  
<% end %>

here''s my controller:

def process_file
    post = Upload.import(params[:file])
    flash[:ok] = "data imported"
  redirect_to :action => index
  end

and here''s my model, where I''m not parsing anything yet, just
putting a stub
message to the screen (can one do that in a model? not sure...), just to see 
if this part works:

 require ''fastercsv''
...
 def self.import(file)
    datafile = FasterCSV.new(params[:file])
    n = 0
    FasterCSV.foreach(datafile) do |row|
      puts ''on row ''.n
      n = n+1
    end
  end


However, the error I get when I submit a file is:

NameError in UploadsController#process_file 

undefined local variable or method `params'' for
#<Class:0xb6987e78>
...
vendor/rails/activerecord/lib/active_record/base.rb:1667:in
`method_missing''
app/models/upload.rb:21:in `import''

Can anyone please help me to spot the error of my ways?

thanks in advance,
rick
app/controllers/uploads_controller.rb:90:in `process_file''




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You''re referencing params from your model - you don''t have
access to that.
 datafile = FasterCSV.new(params[:file])
should be
 datafile = FasterCSV.new(file)

Best Wishes,
Peter

On Feb 17, 2011, at 10:29 AM, rixter wrote:
> I''m new to ROR, so still getting used to the MVC syntax; but think
I have a simple example here that I hope someone can tell me what I''m
doing wrong (& maybe help someone else by doing so):
> 
> All I''m trying to do is upload a CSV file, then parse each row of
data in it (the first how contains header data).
> 
> Here''s the essential part of my view:
> 
> <% form_tag ({:action => ''process_file''},
>               :multipart => true) do %>
>   <%= file_field_tag ''file'' %>
>   <p>
>     <%= submit_tag "Upload" %>
>   </p>
>   
> <% end %>
> 
> here''s my controller:
> 
> def process_file
>     post = Upload.import(params[:file])
>     flash[:ok] = "data imported"
>   redirect_to :action => index
>   end
> 
> and here''s my model, where I''m not parsing anything yet,
just putting a stub message to the screen (can one do that in a model? not
sure...), just to see if this part works:
> 
>  require ''fastercsv''
> ...
>  def self.import(file)
>     datafile = FasterCSV.new(params[:file])
>     n = 0
>     FasterCSV.foreach(datafile) do |row|
>       puts ''on row ''.n
>       n = n+1
>     end
>   end
> 
> 
> However, the error I get when I submit a file is:
> 
> NameError in UploadsController#process_file
> 
> undefined local variable or method `params'' for
#<Class:0xb6987e78>
> ...
> vendor/rails/activerecord/lib/active_record/base.rb:1667:in
`method_missing''
> app/models/upload.rb:21:in `import''
> 
> Can anyone please help me to spot the error of my ways?
> 
> thanks in advance,
> rick
> app/controllers/uploads_controller.rb:90:in `process_file''
> 
> 
> 
> 
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Thanks! That helped..(.now on to the next bug...)

rick

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