Rails - Jul 2008 - Data type of input type file

If I have a form that includes something like:

<input type="file" name="file_content" />

and I try to get at the file content using:

params[''file_content''].read

I get:

undefined method `read'' for "filename":String

where "filename" is the *NAME* of the file that was assigned to
"file_content" in the input tag.

Apparently Ruby thinks my file is a string and that consequently it
has no ''read'' method.  What am I doing wrong and how can I get
at the
actual file content?

Thanks for any input.

        ... doug

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On 8 Jul 2008, at 02:55, doug wrote:
>
> If I have a form that includes something like:
>
> <input type="file" name="file_content" />
>
> and I try to get at the file content using:
>
> params[''file_content''].read
>
> I get:
>
> undefined method `read'' for "filename":String
>
> where "filename" is the *NAME* of the file that was assigned to
> "file_content" in the input tag.
>
> Apparently Ruby thinks my file is a string and that consequently it
> has no ''read'' method.  What am I doing wrong and how can
I get at the
> actual file content?
Is your form set to be multipart ?

Fred

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> Is your form set to be multipart ?
Great thought and it would have really been embarrassing if that had
turned out to be the case; but, it wasn''t.  I do have the form set to
multipart with the following attribute to the form tag:

enctype="multipart/form-data"

I thought this was going to be some really obvious stupid error on my
part like the one you suggested and I thought someone would likely
point it out to me within a few minutes of my post.  I guess that''s
not the case.  Now, I''m beginning to think that I don''t
understand
exactly what it is that comes back in the params hash as a result of
having a <input type="file"> tag in the form.  If someone could
enlighten me on that, it would be great.

Thanks for the input.

       ... doug
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On 8 Jul 2008, at 17:11, doug wrote:
>
>> Is your form set to be multipart ?
>
> Great thought and it would have really been embarrassing if that had
> turned out to be the case; but, it wasn''t.  I do have the form set
to
> multipart with the following attribute to the form tag:
>
> enctype="multipart/form-data"
>
Have you verified in the browser that the expected html is generated?  
Have you looked with a packet sniffer to see if the file is being sent  
to the server?

Fred
> I thought this was going to be some really obvious stupid error on my
> part like the one you suggested and I thought someone would likely
> point it out to me within a few minutes of my post.  I guess
that''s
> not the case.  Now, I''m beginning to think that I don''t
understand
> exactly what it is that comes back in the params hash as a result of
> having a <input type="file"> tag in the form.  If someone
could
> enlighten me on that, it would be great.
>
> Thanks for the input.
>
>       ... doug
> >

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Thanks for your input and patience, Fred.

As is usually the case in these types of situations, the problem
turned out to be a factor that I didn''t deem as being relevant.  That
factor is that access is being controlled by sessions.  The brief
explanation is that I made my form by using straight HTML rather than
the Rails helpers.  Without going into all of the gory details, one
needs to use the Rails helpers in this case.  I now have it working.
Thanks for the input.

            ... doug
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Master Cheung,
I see you mention a ''packet sniffer''. What is that and how
does one
implement one?
I am grateful for any explanation.
Thank you,
Kathleen

On Jul 8, 10:18 am, Frederick Cheung
<frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> On 8 Jul 2008, at 17:11, doug wrote:
>
>
>
> >> Is your form set to be multipart ?
>
> > Great thought and it would have really been embarrassing if that had
> > turned out to be the case; but, it wasn''t.  I do have the
form set to
> > multipart with the following attribute to the form tag:
>
> > enctype="multipart/form-data"
>
> Have you verified in the browser that the expected html is generated?  
> Have you looked with a packet sniffer to see if the file is being sent  
> to the server?
>
> Fred
>
> > I thought this was going to be some really obvious stupid error on my
> > part like the one you suggested and I thought someone would likely
> > point it out to me within a few minutes of my post.  I guess
that''s
> > not the case.  Now, I''m beginning to think that I
don''t understand
> > exactly what it is that comes back in the params hash as a result of
> > having a <input type="file"> tag in the form.  If
someone could
> > enlighten me on that, it would be great.
>
> > Thanks for the input.
>
> >       ... doug
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On 9 Jul 2008, at 14:59, KathysKode-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
wrote:
>
> Master Cheung,
> I see you mention a ''packet sniffer''. What is that and
how does one
> implement one?
It''s a piece of software that dumps/displays all the packets going  
through your machine (usually with the ability to filter based on a  
set of conditions so that you can narrow it down to what you''re trying
to observe)
Eg tcpdump, wireshark (formally ethereal) etc..
On unixy platforms, there are a set of ruby bindings for libpcap (the  
library that tcpdump uses) if you feel like doing your packet sniffing  
from ruby.


Slightly different, but also interesting are things like 
http://www.charlesproxy.com/
  and http://www.fiddlertool.com/fiddler/ These are http proxies that  
let you inspect all the traffic being passed through.

Fred

>
> I am grateful for any explanation.
> Thank you,
> Kathleen
>
> On Jul 8, 10:18 am, Frederick Cheung
<frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> wrote:
>> On 8 Jul 2008, at 17:11, doug wrote:
>>
>>
>>
>>>> Is your form set to be multipart ?
>>
>>> Great thought and it would have really been embarrassing if that
had
>>> turned out to be the case; but, it wasn''t.  I do have the
form set
>>> to
>>> multipart with the following attribute to the form tag:
>>
>>> enctype="multipart/form-data"
>>
>> Have you verified in the browser that the expected html is generated?
>> Have you looked with a packet sniffer to see if the file is being  
>> sent
>> to the server?
>>
>> Fred
>>
>>> I thought this was going to be some really obvious stupid error on
>>> my
>>> part like the one you suggested and I thought someone would likely
>>> point it out to me within a few minutes of my post.  I guess
that''s
>>> not the case.  Now, I''m beginning to think that I
don''t understand
>>> exactly what it is that comes back in the params hash as a result
of
>>> having a <input type="file"> tag in the form.  If
someone could
>>> enlighten me on that, it would be great.
>>
>>> Thanks for the input.
>>
>>>       ... doug
> >

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