How do I upload an image with Sinatra (like Paperclip)?

Ruby
1

Hi all,

I need to upload an image from my local computer to a web server and
store the location in a database (similar to how Paperclip and
attachment_fu work) in Sinatra.

Any ideas on how to get this to work?

Thanks in advance,
Tony

2

If you use datamapper, there is an paperclip for datamapper!

regards!

3

Marcos V. wrote:

If you use datamapper, there is an paperclip for datamapper!

regards!

Thanks for the reply! I’m using ActiveRecord and wouldn’t want to change
to Datamapper unless I HAD to. Thanks again, I’ll look into it as soon
as I get a chance.

-Tony

4

Tony T. wrote:

I need to upload an image from my local computer to a web server and
store the location in a database (similar to how Paperclip and
attachment_fu work) in Sinatra.

I don’t know Paperclip or attachment_fu, but getting the attachment in
Sinatra is easy: you get an open tempfile that you read from.

Something like this (extracted from some working code but not tested in
isolation):

post ‘/upload’ do
unless params[:file] &&
(tmpfile = params[:file][:tempfile]) &&
(name = params[:file][:filename])
@error = “No file selected”
return haml(:upload)
end
STDERR.puts “Uploading file, original name #{name.inspect}”
while blk = tmpfile.read(65536)
# here you would write it to its final location
STDERR.puts blk.inspect
end
“Upload complete”
end

%h1 Upload

%form{:action=>"/upload",:method=>“post”,:enctype=>“multipart/form-data”}
%input{:type=>“file”,:name=>“file”}
%input{:type=>“submit”,:value=>“Upload”}

5

Thank you Brian! I will give it a shot when I have some time and reply
here. Truly appreciate it!

-Tony

6

Brian C. wrote:

Tony T. wrote:

I need to upload an image from my local computer to a web server and
store the location in a database (similar to how Paperclip and
attachment_fu work) in Sinatra.

I don’t know Paperclip or attachment_fu, but getting the attachment in
Sinatra is easy: you get an open tempfile that you read from.

Something like this (extracted from some working code but not tested in
isolation):

post ‘/upload’ do
unless params[:file] &&
(tmpfile = params[:file][:tempfile]) &&
(name = params[:file][:filename])
@error = “No file selected”
return haml(:upload)
end
STDERR.puts “Uploading file, original name #{name.inspect}”
while blk = tmpfile.read(65536)
# here you would write it to its final location
STDERR.puts blk.inspect
end
“Upload complete”
end

%h1 Upload

%form{:action=>“/upload”,:method=>“post”,:enctype=>“multipart/form-data”}
%input{:type=>“file”,:name=>“file”}
%input{:type=>“submit”,:value=>“Upload”}

That is helpful.Thank u so much

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7

phanks:

post ‘/upload’ do
unless params[:file] &&
(tmpfile = params[:file][:tempfile]) &&
(name = params[:file][:filename])
@error = “No file selected”
return haml(:upload)
end
directory = “public/files”
path = File.join(directory, name)
File.open(path, “wb”) { |f| f.write(tmpfile.read) }
end

so will be better for me :slight_smile:

8

Brian C. wrote in post #929342:

Almaz OM wrote:

phanks:

post ‘/upload’ do
unless params[:file] &&
(tmpfile = params[:file][:tempfile]) &&
(name = params[:file][:filename])
@error = “No file selected”
return haml(:upload)
end
directory = “public/files”
path = File.join(directory, name)
File.open(path, “wb”) { |f| f.write(tmpfile.read) }
end

so will be better for me :slight_smile:

OK. Beware that f.write(tmpfile.read) will use as much RAM as the size
of the attachment. Hence the suggestion to read it in and write it out
in blocks of, say, 64K.

“f.write(tmpfile.read)”?? Why so complex?..

post ‘/upload’ do
tempfile = params[‘file’][:tempfile]
filename = params[‘file’][:filename]
File.copy(tempfile.path, “./files/#{filename}”)
redirect ‘/’
end

9

Almaz OM wrote:

phanks:

post ‘/upload’ do
unless params[:file] &&
(tmpfile = params[:file][:tempfile]) &&
(name = params[:file][:filename])
@error = “No file selected”
return haml(:upload)
end
directory = “public/files”
path = File.join(directory, name)
File.open(path, “wb”) { |f| f.write(tmpfile.read) }
end

so will be better for me :slight_smile:

OK. Beware that f.write(tmpfile.read) will use as much RAM as the size
of the attachment. Hence the suggestion to read it in and write it out
in blocks of, say, 64K.