multiple paperclip attachements with watermark processor
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26-09-2019 - |
Question
I'm having a ton of trouble with uploading multiple attachments with paperclip and processing them with a watermark.
I have 2 models, Ad and Photo. The Ad has_many :photos and the Photo belongs_to :ad.
To be more exact in /models/ad.rb I have:
class Ad < ActiveRecord::Base
has_many :photos, :dependent => :destroy
accepts_nested_attributes_for :photos, :allow_destroy => true
end
and my photo.rb file looks like this:
class Photo < ActiveRecord::Base
belongs_to :ad
has_attached_file :data,
:styles => {
:thumb => "100x100#",
:first => {
:processors => [:watermark],
:geometry => '300x250#',
:watermark_path => ':rails_root/public/images/watermark.png',
:position => 'SouthEast' },
:large => {
:processors => [:watermark],
:geometry => '640x480#',
:watermark_path => ':rails_root/public/images/watermark.png',
:position => 'SouthEast' }
}
end
In my view I use this to add the file fields
<% f.fields_for :photos do |p| %>
<%= p.label :data, 'Poza:' %> <%= p.file_field :data %>
<% end %>
In my controller, in the edit action i use 4.times {@ad.photos.build}
to generate the file fields.
It all works fine and dandy if I don't use the watermark processor, if I use a normal has_attached_file declaration, like this:
has_attached_file :data,
:styles => {
:thumb => "100x100#",
:first => '300x250#',
:large => '640x480#'
}
But when I use the watermark processor I always get this error:
NoMethodError in PublicController#update_ad
You have a nil object when you didn't expect it!
You might have expected an instance of ActiveRecord::Base.
The error occurred while evaluating nil.[]
..............................
/usr/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/nested_attributes.rb:350:in `assign_nested_attributes_for_collection_association'
/usr/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/nested_attributes.rb:345:in `each'
/usr/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/nested_attributes.rb:345:in `assign_nested_attributes_for_collection_association'
/usr/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/nested_attributes.rb:243:in `photos_attributes='
/usr/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/base.rb:2746:in `send'
/usr/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/base.rb:2746:in `attributes='
/usr/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/base.rb:2742:in `each'
/usr/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/base.rb:2742:in `attributes='
/usr/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/base.rb:2628:in `update_attributes'
/home/alexg/Sites/vandmasina/app/controllers/public_controller.rb:217
/home/alexg/Sites/vandmasina/app/controllers/public_controller.rb:216:in `update_ad'
The parameters are ok, as far as I can say
Parameters:
{"commit"=>"Salveaza modificarile",
"ad"=>{"price"=>"6000",
"oras"=>"9",
"photos_attributes"=>{"0"=>{"data"=>#<File:/tmp/RackMultipart20100928-5130-b42noe-0>},
"1"=>{"data"=>#<File:/tmp/RackMultipart20100928-5130-r0ukcr-0>},
"2"=>{"data"=>#<File:/tmp/RackMultipart20100928-5130-mb23ei-0>},
"3"=>{"data"=>#<File:/tmp/RackMultipart20100928-5130-1bpkm3b-0>}},
The Watermark processor /lib/paperclip_processors/watermark.rb looks like this:
module Paperclip
class Watermark < Processor
class InstanceNotGiven < ArgumentError;
end
def initialize(file, options = {},attachment = nil)
super
@file = file
@current_format = File.extname(@file.path)
@basename = File.basename(@file.path, @current_format)
@watermark = ':rails_root/public/images/watermark.png'
@current_geometry = Geometry.from_file file # This is pretty slow
@watermark_geometry = watermark_dimensions
end
def watermark_dimensions
return @watermark_dimensions if @watermark_dimensions
@watermark_dimensions = Geometry.from_file @watermark
end
def make
dst = Tempfile.new([@basename, @format].compact.join("."))
watermark = " \\( #{@watermark} -extract #{@current_geometry.width.to_i}x#{@current_geometry.height.to_i}+#{@watermark_geometry.height.to_i /
2}+#{@watermark_geometry.width.to_i / 2} \\) "
command = "-gravity center " + watermark + File.expand_path(@file.path) + " " +File.expand_path(dst.path)
begin
success = Paperclip.run("composite", command.gsub(/\s+/, " "))
rescue PaperclipCommandLineError
raise PaperclipError, "There was an error processing the watermark for #{@basename}" if @whiny_thumbnails
end
dst
end
end
end
I have tried the processor in a normal app, without multiple attachments and it works perfect. It doesn't work with nested_attributes as far as I can tell.
The app is rails 2.3.5 with ruby 1.8.7 and paperclip 2.3.11
If you can provide any help it would be appreciated a lot, since I've been trying to figure this out for 2 days now :)
Solution
Oh, man, that was a tough one!
You have few errors in your code and none is related to nested models. My explanation is for Rails 3 & Paperclip 2.3.3
a) the :rails_root thing doesn't work. This interpolation is used only in url/path and not on custom options. So you should replace it with Rails.root.join("public/images...")
b) you simply ignore the :watermark_path option and you use only hardcoded path (in initialization method). So it doesn't matter what you have in your :styles as it always go for .../images/watermark.png. The :rails_root thingy there again so it cannot work.
c) when you pass a parameter to Paperclip.run("composite", "foo bar there") it actually executes this command:
composite 'foo bar there'
can you see the single quotes? Because of that the composite command see your parameters as one huge parameter and doesn't understand it at all. If you pass it as an array, then every item is enclosed in the quotes, not the array as a whole.
So here is the improved version of watermark processor:
module Paperclip
class Watermark < Processor
class InstanceNotGiven < ArgumentError;
end
def initialize(file, options = {},attachment = nil)
super
@file = file
@current_format = File.extname(@file.path)
@basename = File.basename(@file.path, @current_format)
# PAWIEN: use default value only if option is not specified
@watermark = options[:watermark_path] || Rails.root.join('public/images/watermark.png')
@current_geometry = Geometry.from_file file # This is pretty slow
@watermark_geometry = watermark_dimensions
end
def watermark_dimensions
return @watermark_dimensions if @watermark_dimensions
@watermark_dimensions = Geometry.from_file @watermark
end
def make
dst = Tempfile.new([@basename, @format].compact.join("."))
dst.binmode
begin
# PAWIEN: change original "stringy" approach to arrayish approach
# inspired by the thumbnail processor
options = [
"-gravity",
"center",
"#{@watermark}",
"-extract",
"#{@current_geometry.width.to_i}x#{@current_geometry.height.to_i}+#{@watermark_geometry.height.to_i / 2}+#{@watermark_geometry.width.to_i / 2}",
File.expand_path(@file.path),
File.expand_path(dst.path)
].flatten.compact.join(" ").strip.squeeze(" ")
success = Paperclip.run("composite", options)
rescue PaperclipCommandLineError
raise PaperclipError, "There was an error processing the watermark for #{@basename}" if @whiny_thumbnails
end
dst
end
end
end
Hope that helped you!
UPDATE: You need to use latest paperclip gem from github
gem 'paperclip', '>= 2.3.3', :git => "http://github.com/thoughtbot/paperclip.git"
In this version the formats of #run were changed once again so I've updated the code. It really should work as I've created test application and it's doing what supposed.
UPDATE 2: Repo with working example:
git://repo.or.cz/paperclip-mass-example.git
OTHER TIPS
If you use rails 3 and paperclip > 2.3.3, try https://gist.github.com/843418 source.
Just from a quick glance it looks like watermark_path should be "#{Rails.root}/..." though it looks like you have a lot going on here.
Also, I don't see your form as in form_for. Make sure you have {:multipart => true}