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

ruby-talk
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

···

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2

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

regards!

3

Tony Tony 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"}
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4

Marcos Vanetta 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

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5

Brian Candler wrote:

Tony Tony 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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6

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

-Tony

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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:

···

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8

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.

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9

Brian Candler 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

···

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