At least I suspect it''s a simple problem. I''m quite new.
I have written a class to store images, and generate thumbnails for
them. This works well.
However I''ve been having a lot of trouble getting it to keep track of
the files size.
1: class Photo < ActiveRecord::Base
2: file_column :image, :magick => {
3: :versions => {
4: "thumb" => {
5: :transformation => Proc.new { |image|
6: image.change_geometry!(''160x120'') {
|cols, rows,
img|
7: img.thumbnail!(cols, rows)
8: }
9: },
10: :attributes => { :quality => 50 }
11: }
12: }
13: }
14: end
With rmagick it''s possible to access the size like so:
Magick::ImageList.new(image_address).filesize
So I was thinking of adding a method:
def getsize
Magick::ImageList.new(image).filesize #or should this be
@image?
end
Or perhaps this underneath line 5:
@size = image.filesize
However both of these trigger errors. Could someone help?
Thanks!
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Mark Reginald James
2008-Jan-21 05:46 UTC
Re: simple RoR problem with file_column / rmagick
Aaaarg wrote:> def getsize > Magick::ImageList.new(image).filesize #or should this be > @image? > end > > Or perhaps this underneath line 5: > @size = image.filesize > > However both of these trigger errors. Could someone help?Try either Magick::ImageList.new(image).cur_image.filesize or Magick::Image.read(image).first.filesize -- We develop, watch us RoR, in numbers too big to ignore. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
Thank you very much for the suggestions but it''s not quite what
I''m
looking for.
I think what I''m having trouble with is more basic.
What I want to be able to is access the file size (and other
attributes) outside, from an rhtml file.
I have done this successfully by adding this line to the rhtml file:
<%= Magick::ImageList.new(photo.image).filesize %>
Although this works, it incurs a massive time penalty, somewhere
around 1 second per image.
I think the best method would be to get the size and store it when the
image is saved, which is why I thought of putting this beneath line 5:
@size = image.filesize
however that does nothing so far as I can tell.
I had another thought - defining this function at the start of the
class:
def store_size(image)
@size = image.filesize
end
and adding this beneath line 5:
store_size(image)
however this gives the error ''undefined method
`write_description'' for
Photo:Class''
So how do I call a function on the object rather than the class from
the block starting at line 5?
Thanks again!
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add a feild ''size'' to your table and this will work class some_class before_save :store_size def store_size size = image.filesize end .... end -- Posted via http://www.ruby-forum.com/. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
Hi, thanks for the reply. Still not quite what I''m looking for
unfortunately.
I''ve posted the relevant code online for anyone willing to look:
http://pastie.caboo.se/141484
It is what I assumed would work, and I think it would except that when
I call store_image_description from where I do, it tries to call it on
the class, and not the object.
Any ideas?
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Already solved?
I had to patch file_column a little bit. The Problem is, that you can''t
access the image anywhere but on the filesystem. "image" holds only
the
name of the file. So 2 options:
1. Before store: load the file again into memory and get the size
2. Patch file_column to call some "after_render" method with the
image,
so you can do your info extraction.
You could insert this method in magic_file_column.rb in BaseUploaded
def call_after_render(img,version)
if options[:after_render]
options[:after_render].each do |sym|
@instance.send(sym,img,version)
end
end
end
now call this method from within transform_with_magick where apropriate.
in your model you should use sth like
file_column :image, :after_render => [:myinfoextractor]
private
def myinfoextractor(img,version)
self.width=img.columns
end
I think that should give you some clue what to do...
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Simple solution: attachment_fu -- Posted via http://www.ruby-forum.com/. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
Ar Chron wrote:> Simple solution: attachment_fuQ: How can I tune my Mercedes? A: Buy a Porsche. ;-) -- Posted via http://www.ruby-forum.com/. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
Sounds like a winner to me!
(''course, I''ve always been partial to Porche''s...
maybe cause I got to
use one for HS prom... what a memory!)
As for the Rails bit, I think Ar''s right on. If you''ve already
got
rmagick working, just slap in attachment_fu. It''s dirt-easy and quite
powerful and configurable. If you are having to monkeypatch
file_column to access size data and the like, then I really, seriously
recommend attachment_fu and spend the rest of the otherwise-
monkeypatch-time celebrating your fine Rails app over beers or lattes.
That''s my strategy, at any rate.
-Danimal
On Apr 9, 12:22 am, Peter Schrammel
<rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:>
> Q: How can I tune my Mercedes?
> A: Buy a Porsche. ;-)
> --
> Posted viahttp://www.ruby-forum.com/.
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