# App Model "Image" conflicts with RMagick "Image"

**URL:** <https://www.ruby-forum.com/t/app-model-image-conflicts-with-rmagick-image/73841>\
**Category:** Rails\
**Created:** [October 27, 2006, 2:32pm UTC](https://www.ruby-forum.com/t/app-model-image-conflicts-with-rmagick-image/73841 "2006-10-27T14:32:51Z")\
**Posts on this page:** 8\
**Page:** 1

<div class="post-metadata">

**Author:** ![carl](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/ee7513/32.png) [@carl](https://www.ruby-forum.com/u/carl)\
**Post date:** [October 27, 2006, 2:32pm UTC](https://www.ruby-forum.com/t/app-model-image-conflicts-with-rmagick-image/73841/1 "2006-10-27T14:32:51Z")

</div>

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.

---

<div class="post-metadata">

**Author:** ![carl](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/ee7513/32.png) [@carl](https://www.ruby-forum.com/u/carl)\
**Post date:** [October 27, 2006, 3:11pm UTC](https://www.ruby-forum.com/t/app-model-image-conflicts-with-rmagick-image/73841/2 "2006-10-27T15:11:36Z")

</div>

Rename the model

Picture  
Graphic  
Photo

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

---

<div class="post-metadata">

**Author:** ![carl](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/ee7513/32.png) [@carl](https://www.ruby-forum.com/u/carl)\
**Post date:** [October 27, 2006, 3:39pm UTC](https://www.ruby-forum.com/t/app-model-image-conflicts-with-rmagick-image/73841/3 "2006-10-27T15:39:39Z")

</div>

Hello Carl,

2006/10/27, Carl [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid):

> 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://blog.teksol.info/)  
[http://piston.rubyforge.org/](http://piston.rubyforge.org/)

---

<div class="post-metadata">

**Author:** ![carl](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/ee7513/32.png) [@carl](https://www.ruby-forum.com/u/carl)\
**Post date:** [October 27, 2006, 9:16pm UTC](https://www.ruby-forum.com/t/app-model-image-conflicts-with-rmagick-image/73841/4 "2006-10-27T21:16:43Z")

</div>

François Beausoleil wrote:

> Hello Carl,
> 
> 2006/10/27, Carl [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid):
> 
> > 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://blog.teksol.info/)  
> [http://piston.rubyforge.org/](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.

---

<div class="post-metadata">

**Author:** ![carl](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/ee7513/32.png) [@carl](https://www.ruby-forum.com/u/carl)\
**Post date:** [October 28, 2006, 2:56am UTC](https://www.ruby-forum.com/t/app-model-image-conflicts-with-rmagick-image/73841/5 "2006-10-28T02:56:53Z")

</div>

François Beausoleil wrote:

> Hello Carl,
> 
> 2006/10/27, Carl [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid):
> 
> > 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://blog.teksol.info/)  
> [http://piston.rubyforge.org/](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

---

<div class="post-metadata">

**Author:** ![carl](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/ee7513/32.png) [@carl](https://www.ruby-forum.com/u/carl)\
**Post date:** [October 27, 2006, 3:57pm UTC](https://www.ruby-forum.com/t/app-model-image-conflicts-with-rmagick-image/73841/6 "2006-10-27T15:57:41Z")

</div>

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

---

<div class="post-metadata">

**Author:** ![carl](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/ee7513/32.png) [@carl](https://www.ruby-forum.com/u/carl)\
**Post date:** [October 28, 2006, 3:01am UTC](https://www.ruby-forum.com/t/app-model-image-conflicts-with-rmagick-image/73841/7 "2006-10-28T03:01:13Z")

</div>

Alex W. wrote:

> François Beausoleil wrote:
> 
> > Hello Carl,
> > 
> > 2006/10/27, Carl [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid):
> > 
> > > 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://blog.teksol.info/)  
> > [http://piston.rubyforge.org/](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.

---

<div class="post-metadata">

**Author:** ![carl](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/ee7513/32.png) [@carl](https://www.ruby-forum.com/u/carl)\
**Post date:** [October 28, 2006, 2:59am UTC](https://www.ruby-forum.com/t/app-model-image-conflicts-with-rmagick-image/73841/8 "2006-10-28T02:59:11Z")

</div>

Eric A. 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