> On Mar 15, 2016, at 4:28 AM, Nilesh <navale.nil...@gmail.com> 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
>
>
> 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.
>
>
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