thr3ads.net - Rails - App Model "Image" conflicts with RMagick "Image" [Oct 2006]

If this information is useful, please help other people find it:
Share via:

Carl

2006-Oct-27 12:32 UTC

App Model "Image" conflicts with RMagick "Image"

Hello,

In the following code from my RoR app:

**** Code ***
require ''RMagick''
include Magick

class ThumbnailController < ApplicationController
  def thumbnail
    image = Image.find(params[:id])

    thumbnail = Magick::Image.new("#{RAILS_ROOT}image.path")
   
thumbnail.change_geometry("#{params[:max_width]}x#{params[:max_height]}")

    send_data thumbnail.to_blob,
      :type => image.content_type,
      :disposition => ''inline'',
      :filename => "#{images.id} Thumbnail.#{image.extension}"
  end
end
*** End Code ***

Where Image is a model I have created for my app, I get the error:

"undefined method `find'' for Magick::Image:Class"

because apparently Magick::Image has supplanted my Image model as the
top-level symbol (and clearly ''find'' isn''t a defined
method for it.)  I
am looking for suggestions to solve this conflict. Below are some of my 
thoughts; please comment on the applicability of
them to a RoR application.

(1) Rename my model, perhaps with some prefix: MyImage.  This seems
unacceptable because idiomatic Rails applications name their models
models clearly after the concept they encapsulate.

(2) Put my model in a namespace: Module::Image.  This solution is
recommended against on the web for somewhat vague reasons.  It also
seems awkward to have to type the Module name before the model each
time.

Neither of these solutions seems ideal.  Some other possibilities
(about which I know little) are:

(3) Somehow explicitly refer to my Image model using some foolproof
reference system.  Perhaps some Module or default namespace that a
Rails application''s models are all in?  Basically: is there any way at
all to refer to my Image model without relying upon it to be in Ruby''s
top-level symbol table?

(4) Somehow refer to the RMagick::Image model without importing the
model''s name into the top-level symbol table.  Is this possible?

Thank you.

-- 
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
-~----------~----~----~----~------~----~------~--~---

Brian Hogan

2006-Oct-27 12:50 UTC

head link

Re: App Model "Image" conflicts with RMagick "Image"

Rename the model

Picture
Graphic
Photo

I ran into this too. It''s just easier not to fight it.


On 10/27/06, Carl
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:>
>
> Hello,
>
> In the following code from my RoR app:
>
> **** Code ***
> require ''RMagick''
> include Magick
>
> class ThumbnailController < ApplicationController
>   def thumbnail
>     image = Image.find(params[:id])
>
>     thumbnail = Magick::Image.new("#{RAILS_ROOT}image.path")
>     thumbnail.change_geometry
> ("#{params[:max_width]}x#{params[:max_height]}")
>
>     send_data thumbnail.to_blob,
>       :type => image.content_type,
>       :disposition => ''inline'',
>       :filename => "#{images.id} Thumbnail.#{image.extension}"
>   end
> end
> *** End Code ***
>
> Where Image is a model I have created for my app, I get the error:
>
> "undefined method `find'' for Magick::Image:Class"
>
> because apparently Magick::Image has supplanted my Image model as the
> top-level symbol (and clearly ''find'' isn''t a
defined method for it.)  I
> am looking for suggestions to solve this conflict. Below are some of my
> thoughts; please comment on the applicability of
> them to a RoR application.
>
> (1) Rename my model, perhaps with some prefix: MyImage.  This seems
> unacceptable because idiomatic Rails applications name their models
> models clearly after the concept they encapsulate.
>
> (2) Put my model in a namespace: Module::Image.  This solution is
> recommended against on the web for somewhat vague reasons.  It also
> seems awkward to have to type the Module name before the model each
> time.
>
> Neither of these solutions seems ideal.  Some other possibilities
> (about which I know little) are:
>
> (3) Somehow explicitly refer to my Image model using some foolproof
> reference system.  Perhaps some Module or default namespace that a
> Rails application''s models are all in?  Basically: is there any
way at
> all to refer to my Image model without relying upon it to be in
Ruby''s
> top-level symbol table?
>
> (4) Somehow refer to the RMagick::Image model without importing the
> model''s name into the top-level symbol table.  Is this possible?
>
> Thank you.
>
> --
> 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
-~----------~----~----~----~------~----~------~--~---

Francois Beausoleil

2006-Oct-27 13:15 UTC

head link

Re: App Model "Image" conflicts with RMagick "Image"

Hello Carl,

2006/10/27, Carl
<rails-mailing-list@andreas-s.net>:> require 'RMagick'
> include Magick
"Don't do that" !  You're including the Magick methods into
the global
namespace.  That's why your Image model can't be picked up.  It is
being shadowed by RMagick's Image class.

Looking at your code, you are already using properly namespaced
RMagick constants / classes.

Hope that helps !
-- 
François Beausoleil
http://blog.teksol.info/
http://piston.rubyforge.org/

--~--~---------~--~----~------------~-------~--~----~
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@googlegroups.com
To unsubscribe from this group, send email to
rubyonrails-talk-unsubscribe@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk
-~----------~----~----~----~------~----~------~--~---

Eric Anderson

2006-Oct-27 13:24 UTC

head link

Re: App Model "Image" conflicts with RMagick "Image"

Carl wrote:> (3) Somehow explicitly refer to my Image model using some foolproof
> reference system.  Perhaps some Module or default namespace that a
> Rails application''s models are all in?  Basically: is there any
way at
> all to refer to my Image model without relying upon it to be in
Ruby''s
> top-level symbol table?
Seems like I ran into something like this before. Will

image = ::Image.find(params[:id])

work? Seems like it should.

Eric


--~--~---------~--~----~------------~-------~--~----~
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
-~----------~----~----~----~------~----~------~--~---

Alex Wayne

2006-Oct-27 19:16 UTC

head link

Re: App Model "Image" conflicts with RMagick "Image"

François Beausoleil wrote:> Hello Carl,
> 
> 2006/10/27, Carl
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>:
>> require ''RMagick''
>> include Magick
> 
> "Don''t do that" !  You''re including the Magick
methods into the global
> namespace.  That''s why your Image model can''t be picked
up.  It is
> being shadowed by RMagick''s Image class.
> 
> Looking at your code, you are already using properly namespaced
> RMagick constants / classes.
> 
> Hope that helps !
> --
> François Beausoleil
> http://blog.teksol.info/
> http://piston.rubyforge.org/
You dont need to "include RMagick" at all.  The problem is solved by 
simply accessing the RMagick Image model by "RMagick::Image" and your 
own with "Image", whic it looks liek your already doing.

remove the "include RMagick" and you should be fine.

-- 
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@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk
-~----------~----~----~----~------~----~------~--~---

Carl

2006-Oct-28 00:56 UTC

head link

Re: App Model "Image" conflicts with RMagick "Image"

François Beausoleil wrote:> Hello Carl,
> 
> 2006/10/27, Carl
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>:
>> require ''RMagick''
>> include Magick
> 
> "Don''t do that" !  You''re including the Magick
methods into the global
> namespace.  That''s why your Image model can''t be picked
up.  It is
> being shadowed by RMagick''s Image class.
> 
> Looking at your code, you are already using properly namespaced
> RMagick constants / classes.
> 
> Hope that helps !
> --
> François Beausoleil
> http://blog.teksol.info/
> http://piston.rubyforge.org/
Hi Francois,

Thank you for your suggestion.  It worked!  I still needed the require
statement.  There were also some errors in my previous code.  The
working version of the code is below.

class ThumbnailController < ApplicationController
  def thumbnail
    require ''RMagick''

    image = Image.find(params[:id])

    #read returns an array of all images found in the file (e.g. gif and
psd have multiple images in a single file
    thumbnails =
Magick::Image.read("#{RAILS_ROOT}/public#{image.path}")
    #just assume that we can take the first of the images (for jpg, png,
etc.)
    thumbnail = thumbnails[0]
   
thumbnail.change_geometry("#{params[:max_width]}x#{params[:max_height]}")
{|cols, rows, img|
      thumbnail.resize!(cols, rows)
    }

    send_data thumbnail.to_blob, :type => image.content_type,
:disposition => ''inline'', :filename => "#{image.id}
Thumbnail.#{image.extension}"
  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@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk
-~----------~----~----~----~------~----~------~--~---

Carl

2006-Oct-28 00:59 UTC

head link

Re: App Model "Image" conflicts with RMagick "Image"

Eric Anderson wrote:> Carl wrote:
>> (3) Somehow explicitly refer to my Image model using some foolproof
>> reference system.  Perhaps some Module or default namespace that a
>> Rails application''s models are all in?  Basically: is there
any way at
>> all to refer to my Image model without relying upon it to be in
Ruby''s
>> top-level symbol table?
> 
> Seems like I ran into something like this before. Will
> 
> image = ::Image.find(params[:id])
> 
> work? Seems like it should.
> 
> Eric
Hi Eric,

Thanks for your suggestion.  Using "::" solved the problem.  A version
of the code using that solution is:

class ThumbnailController < ApplicationController
  require ''RMagick''
  include Magick

  def thumbnail

    image = ::Image.find(params[:id])

    #read returns an array of all images found in the file (e.g. gif and
psd have multiple images in a single file
    thumbnails =
Magick::Image.read("#{RAILS_ROOT}/public#{image.path}")
    #just assume that we can take the first of the images (for jpg, png,
etc.)
    thumbnail = thumbnails[0]
   
thumbnail.change_geometry("#{params[:max_width]}x#{params[:max_height]}")
{|cols, rows, img|
      thumbnail.resize!(cols, rows)
    }

    send_data thumbnail.to_blob, :type => image.content_type,
:disposition => ''inline'', :filename => "#{image.id}
Thumbnail.#{image.extension}"
  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
-~----------~----~----~----~------~----~------~--~---

Carl

2006-Oct-28 01:01 UTC

head link

Re: App Model "Image" conflicts with RMagick "Image"

Alex Wayne wrote:> François Beausoleil wrote:
>> Hello Carl,
>> 
>> 2006/10/27, Carl
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>:
>>> require ''RMagick''
>>> include Magick
>> 
>> "Don''t do that" !  You''re including the
Magick methods into the global
>> namespace.  That''s why your Image model can''t be
picked up.  It is
>> being shadowed by RMagick''s Image class.
>> 
>> Looking at your code, you are already using properly namespaced
>> RMagick constants / classes.
>> 
>> Hope that helps !
>> --
>> François Beausoleil
>> http://blog.teksol.info/
>> http://piston.rubyforge.org/
> 
> You dont need to "include RMagick" at all.  The problem is solved
by
> simply accessing the RMagick Image model by "RMagick::Image" and
your
> own with "Image", whic it looks liek your already doing.
> 
> remove the "include RMagick" and you should be fine.
Hi Alex,

Thank you for your suggestion.  If I remove the require and include 
statements entirely, I get the error:

uninitialized constant ThumbnailController::Magick

I am using the Locomotive environment on Mac OS X.  Perhaps in another 
environment it would work.

-- 
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@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk
-~----------~----~----~----~------~----~------~--~---

Rails - Oct 2006 - App Model "Image" conflicts with RMagick "Image"

App Model "Image" conflicts with RMagick "Image"

Re: App Model "Image" conflicts with RMagick "Image"

Re: App Model "Image" conflicts with RMagick "Image"

Re: App Model "Image" conflicts with RMagick "Image"

Re: App Model "Image" conflicts with RMagick "Image"

Re: App Model "Image" conflicts with RMagick "Image"

Re: App Model "Image" conflicts with RMagick "Image"

Re: App Model "Image" conflicts with RMagick "Image"