Rails Forum - Ruby on Rails Help and Discussion Forum - Image uploads and resizing for Rails models with mini-magick

Re: Image uploads and resizing for Rails models with mini-magick

dummy@example.com (ThePiedPipes) — Thu, 06 Nov 2008 22:25:48 +0000

Hi, I figured that I wasn't constructing my form correctly with multipart=true so that fixed that...but now there's another issue: basically the original file is being uploaded to the public folder but no communication with the database has taken place.

there's a whole lotta 'nil' where my image_square etc fields are.

UPDATE: resolved - needed to reboot and redo my paths after installing ImageMagick. Sorted it.

andy

Re: Image uploads and resizing for Rails models with mini-magick

dummy@example.com (ThePiedPipes) — Thu, 06 Nov 2008 21:45:46 +0000

Hello. I'm trying to follow the tutorial, but have received this error:

undefined method `original_filename' for "watermelon.jpg":String

where should I be looking for the original_filename and content_type methods?

I know that they are supposed to be methods of the file, but I have set :multipart => true in the form_tag, so it should be running smoothly.

completely lost as to how to make this work.

thanks in advance.

andy

Re: Image uploads and resizing for Rails models with mini-magick

dummy@example.com (santu_hvr) — Wed, 08 Oct 2008 06:53:39 +0000

I have followed the instructions for mini_magick...but if i add some different kind of image file,than old one.... then old one is not deleting.. pls help. its urgent ...:(

Re: Image uploads and resizing for Rails models with mini-magick

dummy@example.com (ice) — Sat, 20 Sep 2008 16:32:38 +0000

One issue is that this creates images that will load a new image, but won't change the image names. So browsers need to "reload" the view in order to get the new image. You can fix this by adding ?#{Time.now.to_i} after the image reference.

Re: Image uploads and resizing for Rails models with mini-magick

dummy@example.com (mirtzi) — Wed, 25 Jun 2008 16:08:59 +0000

Never mind... I had to install the imagemagick package.
Thanks anyway.

Re: Image uploads and resizing for Rails models with mini-magick

dummy@example.com (mirtzi) — Wed, 25 Jun 2008 16:01:57 +0000

Hi all.
I have a problem, I hope you can help me...
I get the error:
/bin/sh: identify: not found
ImageMagick command (identify "/tmp/d56242f4d5cb7920becf1712dc369132_minimagick8458-94.jpg") failed: Error Given 32512
on this line
mini_magick.rb:124:in `run_command'
P.S. My OS is Ubuntu 8.04.

Re: Image uploads and resizing for Rails models with mini-magick

dummy@example.com (michal) — Tue, 15 Apr 2008 22:45:24 +0000

leomayleomay wrote:

I followed the steps given by the author strictly, it works except for the columns image_small, image_large, image_square, image_original are all nil and the image doesn't get showed (of course, nothing in the database).
I debugged with Netbeans, set break point at "save" method of Picture model, when I stepped to line 28, it jumped directly to line 45, I don't know why this happened, any info will be appreciated, thanks a lot.

Hi leomayleomay,

the jump from line 28 to 45 it's because you didn't create folder products as ianare wrote:

ianare wrote:

You need to manually create this directory first #{RAILS_ROOT}/public/images/products/
worked for me, cheers!

Try to comment the line with "rescue" and you should get an error.

Re: Image uploads and resizing for Rails models with mini-magick

dummy@example.com (leomayleomay) — Sun, 13 Apr 2008 14:51:23 +0000

I followed the steps given by the author strictly, it works except for the columns image_small, image_large, image_square, image_original are all nil and the image doesn't get showed (of course, nothing in the database).
I debugged with Netbeans, set break point at "save" method of Picture model, when I stepped to line 28, it jumped directly to line 45, I don't know why this happened, any info will be appreciated, thanks a lot.

1. require 'mini_magick'
2.
3. class Picture
4.
5. attr_accessor :id, :file
6.
7. def initialize(id,file)
8. @id = id
9. @file = file
10. @filename = base_part_of(file.original_filename)
11. @content_type = file.content_type.chomp
12. end
13.
14. def base_part_of(file_name)
15. name = File.basename(file_name)
16. name.gsub(/[^\w._-]/, '')
17. end
18.
19. def save
20. is_saved = false
21. begin
22. if @file
23. #using @id, find the id of the User, then use the id to create the title
24. if @content_type =~ /^image/
25. #instead of product = Product.find, you can say dog = Dog.find or whatever corresponds to your model.
26. current_product = Product.find(@id.to_i)
27. #Make the directory for the id
28. Dir.mkdir("#{RAILS_ROOT}/public/images/products/#{@id}") unless File.exist?("#{RAILS_ROOT}/public/images/products/#{@id}")
29. #Then create the temp file
30. File.open("#{RAILS_ROOT}/public/images/products/#{@id}/#{@filename}", "wb") do |f|
31. f.write(@file.read)
32. end
33. product_image_crop("#{@filename}")
34. #update the current product
35. image_names = product_image_names("#{@filename}")
36. File.open("#{RAILS_ROOT}/public/yo.txt", "wb") do |f|
37. f.write(image_names)
38. end
39. current_product.update_attributes("image_square" => image_names[0], "image_small" => image_names[1], "image_medium" => image_names[2], "image_original" => image_names[3])
40. is_saved = true
41. end
42. end
43. rescue
44. end
45. return is_saved
46. end
47.
48. def product_image_crop(product_image_title)
49.
50. #product_title = product_title.squeeze.gsub(" ","_").downcase
51. #find the extension for this file
52. image_file_extension = product_image_title[product_image_title.rindex(".") .. product_image_title.length].strip.chomp
53. image = MiniMagick::Image.from_file("#{RAILS_ROOT}/public/images/products/#{@id}/#{product_image_title}")
54.
55. image.resize "400X300"
56. image.write("#{RAILS_ROOT}/public/images/products/#{@id}/#{@id}_medium#{image_file_extension}")
57.
58. image.resize "240X180"
59. image.write("#{RAILS_ROOT}/public/images/products/#{@id}/#{@id}_small#{image_file_extension}")
60.
61. image.resize "50X50"
62. image.write("#{RAILS_ROOT}/public/images/products/#{@id}/#{@id}_square#{image_file_extension}")
63.
64. #Finally, rename the originally uploaded image
65. File.rename("#{RAILS_ROOT}/public/images/products/#{@id}/#{product_image_title}", "#{RAILS_ROOT}/public/images/products/#{@id}/#{@id}_original#{image_file_extension}")
66.
67. end
68.
69. def product_image_names(product_image_title)
70. image_file_extension = product_image_title[product_image_title.rindex(".") .. product_image_title.length].strip.chomp
71. #Generate an array containing the url of all the images
72. ["/images/products/#{@id}/#{@id}_square#{image_file_extension}", "/images/products/#{@id}/#{@id}_small#{image_file_extension}","/images/products/#{@id}/#{@id}_medium#{image_file_extension}", "/images/products/#{@id}/#{@id}_original#{image_file_extension}"]
73. end
74.
75. end

Re: Image uploads and resizing for Rails models with mini-magick

dummy@example.com (EdgeCrusher) — Wed, 26 Sep 2007 11:22:47 +0000

Hi there!

Great tutorial that i try to apply to my application.
The thing is however that it does not work all the way described.
File gets uploaded, the record is sent to database but the image thumbs are not created.

Also i was wandering why do You check and try to open a yo.txt file? Could anyone please try explain this part to me?

 image_names = product_image_names("#{@filename}")
     File.open("#{RAILS_ROOT}/public/yo.txt", "wb") do |f|
         f.write(image_names)
       endp

And one last thing, is there any reasonable way to check the values of variables inside a model? Something similar to the debug() of controller variables? Some getter perhaps?

Any help would be much appreciated.

Best of luck

Michal

Re: Image uploads and resizing for Rails models with mini-magick

dummy@example.com (Hans_Oslo) — Wed, 15 Aug 2007 10:54:38 +0000

What if the user should have to upload an image? How can you check to see if the user actually have selected an image, ant not let the user submit the form without an image?

wowo wrote:

rajesh0363 wrote:
Hi,
I'm getting this error message when loading the page.
NoMethodError in PeopleController#new
undefined method `original_filename' for #...
My error is somewhere in this code block...
 def initialize(id,file)
        @id = id
        @file = file
        @filename =  base_part_of(file.original_filename)
        @content_type = file.content_type.chomp
    end
    
    def base_part_of(file_name)
        name = File.basename(file_name)
        name.gsub(/[^\w\.\-]/,'_')
    end
Does anyone know why am i getting this error message.
Any help would be highly appreciated.
Thanks & best regards,
Rajesh
Hi Rajesh,
I suppose, that you have no file selected for upload. In this case there is no metadata available for the content_type and the original_filename attributes.
To solve this problem, I just have checked for the presence of the file. If there is no file present you don't have to initialize anything.
 def initialize(id,file)
        if file != ""
          @id = id
          @file = file
          @filename =  base_part_of(file.original_filename)
          @content_type = file.content_type.chomp  
        end  
     end
THat's all. This should work.
Best wishes,
wowo

Re: Image uploads and resizing for Rails models with mini-magick

dummy@example.com (G.Lindqvist) — Sat, 04 Aug 2007 13:19:31 +0000

The link http://www.campdojo.com/assets/zip/mage.zip don't work. Is there anyone that still have it?

Re: Image uploads and resizing for Rails models with mini-magick

dummy@example.com (ianare) — Wed, 18 Jul 2007 06:21:47 +0000

20dreamer wrote:

I have everything done, but I found the application not working...
when selected the files, then press "submit", i think it dose goes through the picture.rb correctly, but it does not create any directory or do anything to enter sth to the images columns in the table, and there are no files uploaded at all..
Any clues for the problem??
Thanks!

You need to manually create this directory first #{RAILS_ROOT}/public/images/products/

worked for me, cheers!

Re: Image uploads and resizing for Rails models with mini-magick

dummy@example.com (Hans_Oslo) — Fri, 13 Jul 2007 11:27:26 +0000

This works great, thanks! One question though:

How can I validate the image upload field in the form when register a new article?

This is my form:

I have tried the following in my article-model to validate the image-field without any luck:

validates_presence_of :picture

validates_presence_of :file

validates_presence_of :picture[file]

Since the fields in my database is named image_square, image_small, image_medium, image_original, I have also tried this:

validates_presence_of :image_square, :image_small, :image_medium, :image_original

Nothing seems to work. Anyone got some input on this? Isn't it possible to validate a file-field with "validates_presence_of" ?

Re: Image uploads and resizing for Rails models with mini-magick

dummy@example.com (20dreamer) — Sun, 08 Jul 2007 10:29:31 +0000

I have everything done, but I found the application not working...

when selected the files, then press "submit", i think it dose goes through the picture.rb correctly, but it does not create any directory or do anything to enter sth to the images columns in the table, and there are no files uploaded at all..

Any clues for the problem??
Thanks!

Re: Image uploads and resizing for Rails models with mini-magick

dummy@example.com (rajesh0363) — Tue, 12 Jun 2007 19:36:04 +0000

Thanks Wowo...