Need help with Rails paperclip gem

Currently I am working on a ROR code which uses rails paperclip gem.

My requirement is, to process images as per its file extension.

Case 1: If image type is “svg”, then do not process original image(as
ImageMagick breaks on resizing svg images). Upload original image, along
with large, medium, grayscale, grayscale_small versions. However all
files
will be similar to original file, with different file names. Now I am
able
to upload only original.svg file. However other versions are not created
correctly, and I did not find any solution so far.

Case 2: If it is not a “svg” image, then process image as per given
style.
This is working as expected.

Current code looks like:

has_mongoid_attached_file( :image, {:styles => lambda {
|img_url| img_url.instance.image_content_type != “image/svg+xml” ? {
:large => “x248”,
:medium => “x64”,
:grayscale => { :processors => [:grayscale], :size => “82x82”
},
:grayscale_small => { :processors => [:grayscale], :size =>
“48x48” }
} : {
:large =>
{write-a-code-to-upload-file-same-as-original-file-with-name-large},
:medium =>
{write-a-code-to-upload-file-same-as-original-file-with-name-medium}
:grayscale =>
{write-a-code-to-upload-file-same-as-original-file-with-name-grayscale}
:grayscale_small =>
{write-a-code-to-upload-file-same-as-original-file-with-name-grayscal_small}
}}}

Gem versions:

mongoid: 3.0.15
paperclip: 2.3.11
mongoid-paperclip: 0.0.8

Please let me know if you have worked on similar requirement. Any
pointers
will be highly appreciated.

On 15 March 2016 at 08:28, Nilesh [email protected] wrote:

Currently I am working on a ROR code which uses rails paperclip gem.

My requirement is, to process images as per its file extension.

Case 1: If image type is “svg”, then do not process original image(as
ImageMagick breaks on resizing svg images).

Are you sure there is still a problem resizing svg? I thought that was
fixed some time ago, though I have not done it myself.

Colin

Hi Colin,

Yes, there is still a problem with ruby gem versions I am using. Using
above resize :styles code, produced SVG images are invalid xml, and do
not
open in browser. So I want to upload as it is.

Thanks.

On 15 March 2016 at 09:22, Nilesh [email protected] wrote:

Hi Colin,

Yes, there is still a problem with ruby gem versions I am using. Using above
resize :styles code, produced SVG images are invalid xml, and do not open in
browser. So I want to upload as it is.

Which version are you using?

Colin

$ bundle exec rails -v

Rails 3.1.3

$ ruby -v

ruby 1.9.3p448 (2013-06-27 revision 41675) [x86_64-darwin14.4.0]

Gem versions:

mongoid: 3.0.15
paperclip: 2.3.11
mongoid-paperclip: 0.0.8

On Mar 15, 2016, at 4:28 AM, Nilesh [email protected] wrote:

Currently I am working on a ROR code which uses rails paperclip gem.

My requirement is, to process images as per its file extension.

Here’s how I solved this for a document management system that needed
transcoding for video, resizing for images, and nothing for every other
file type (zip, powerpoint, etc.).

has_attached_file :blob,
:preserve_files => true,
:styles => Proc.new { |a| a.instance.file_styles(a.instance) },
:processors => Proc.new { |a| a.processors(a) }

def file_styles(a)
if a.video?
return {
:thumb => { :geometry => “320x320>”, :format => ‘jpg’, :time =>
1 },
:poster => { :geometry => “1280x720>”, :format => ‘jpg’, :time
=> 1 },
:mp4 => { :geometry => “1280x720>”, :format => :mp4, :streaming
=> true }
}
end
if a.photo?
return { :thumb => [“320x320>”, :png], :large => [“1500x1500>”,
:png] }
end
if a.audio?
return { :wav => [‘audio’, :wav], :mp3 => [‘audio’, :mp3] }
end
{} # if you get here, then there are no styles needed, just the
original
end

def processors(a)
if a.video?
return [:ffmpeg, :qtfaststart]
end
if a.photo?
return [ :my_thumbnail ]
end
if a.audio?
return [ :audio ]
end
[] # if you get here, then no processing needed
end

Hope this helps,

Walter

Here’s how I solved this for a document management system that needed
transcoding for video, resizing for images, and nothing for every other file type
(zip, powerpoint, etc.).

Forgot to mention – the video?, photo?, and audio? methods were just
little helpers I wrote on the model that looked at the mime-type of the
file under review:

def audio?
[‘audio/mpeg’, ‘audio/x-wav’, ‘audio/x-aiff’,
‘audio/ogg’].include?(blob_content_type.to_s.downcase)

In case you wondered…

Walter

On 15 March 2016 at 09:52, Nilesh [email protected] wrote:

$ bundle exec rails -v

Rails 3.1.3

Did you realise that was superseded in Feb 2012 and there have been
critical security fixes since then? That version is not suitable for
use. If this is a new app then start again with Rails version 4, if
an existing one then at least upgrade to the latest 3.1 immediately,
and then migrate to 4 when you can.

paperclip: 2.3.11
That is an even earlier version dating from early 2011. Stop wasting
time trying to make it work and upgrade to latest rails and gems.

$ identify

Version: ImageMagick 6.9.1-10 Q16 x86_64 2016-02-29
http://www.imagemagick.org

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