Rails - Sep 2010 - How to access a model method from within a view?

I have asked this question on this forum:
http://www.ruby-forum.com/topic/216998#new

I think that main key here is how can I access the method in a model
within a view. Is there a way to do that?

Thanks.
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Abder-Rahman Ali wrote:
> I have asked this question on this forum:
> http://www.ruby-forum.com/topic/216998#new
> 
> I think that main key here is how can I access the method in a model
> within a view. Is there a way to do that?
If you have a model object, you can always call methods on it.

But be careful!  The principles of MVC architecture state that there 
shouldn''t be very much logic (if any!) in your view code.  You probably
want to move the method call to a helper or the controller.
> 
> Thanks.
Best,
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Marnen Laibow-Koser
http://www.marnen.org
marnen-sbuyVjPbboAdnm+yROfE0A@public.gmane.org
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Thanks Marnen.

Should I write the code the gets the height and width in a helper?

Do you have an idea of how to do that?


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Any ideas on this yet?
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models are accessible from all levels of the application, so you can access
them the same way you access them from controllers

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Thanks radhames.

Can you kindly show me a way on how to code this? As I have been stuck 
on that for a while.

Thanks.
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show the code where you are trying to access, ill see whats wrong with it

On Sun, Sep 19, 2010 at 9:23 AM, Abder-Rahman Ali
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org>wrote:
> Thanks radhames.
>
> Can you kindly show me a way on how to code this? As I have been stuck
> on that for a while.
>
> Thanks.
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radhames brito wrote:
> show the code where you are trying to access, ill see whats wrong with 
> it
Thanks @radhames.

The main issue is how to make a call to the height() and width() methods 
in the model in this line in "show.html.erb":

<canvas id="draw" height = "?????" width=
"?????">
</canvas>

This is my model"dicom.rb":

class Dicom < ActiveRecord::Base
  has_attached_file :photo, :styles => {
  :original => ["100%", :jpg],
  }

  def height()
  uploaded_file = photo.queued_for_write[:original]
  dimensions = Paperclip::Geometry.from_file(uploaded_file)
  return dimensions.height
end

  def width()
  uploaded_file = photo.queued_for_write[:original]
  dimensions = Paperclip::Geometry.from_file(uploaded_file)
  return dimensions.width
  end
end

And, this is my "show.html.erb":

<%= javascript_include_tag "coordinate" %>
<canvas id="draw" height = "" width= "">
</canvas>
<p id="notice"><%= notice %></p>
<p>
<b> Name </b>
<%= @dicom.name %>
</p>
<p>
<b> Image </b>
</p>
<div id="image_element" style="display: none;">
<p>
<%= image_tag @dicom.photo.url , :id => ''dicom_image''
%>
</p>
</div>
<%= update_page_tag do |page|
page << "drawImg();"
end
%>
<%= update_page_tag do |page|
page << "drawLine();"
end
%>
<%= link_to ''Edit'', edit_dicom_path(@dicom) %>
<%= link_to ''Back'', dicoms_path %>

Thanks a lot.
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@radhames. If you want me to send you the whole application, can you sen 
me your email?

I don''t know if you can send me a private message through 
www.ruby-forum.com?

Thanks.
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On Sep 19, 3:11 pm, Abder-Rahman Ali
<li...-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org>
wrote:
> radhames brito wrote:
> > show the code where you are trying to access, ill see whats wrong with
> > it
>
> Thanks @radhames.
>
> The main issue is how to make a call to the height() and width() methods
> in the model in this line in "show.html.erb":
>
> <canvas id="draw" height = "?????" width=
"?????">
> </canvas>
What''s wrong with <%= some_object.width %> ?

Fred

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Frederick Cheung wrote:
> On Sep 19, 3:11�pm, Abder-Rahman Ali
<li...-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote:
>> </canvas>
> What''s wrong with <%= some_object.width %> ?
> 
> Fred
I tried:

<canvas id="draw" height = "@dicom.height" width=
"@dicom.width">
</canvas>

But, I don''t the expected dimensions.

As when I calculated the dimensions using this Javascript function:

I found that the image width and height is 512x512, and the displayed 
image is not correct, as when I manually enter the height and width 
values in the "Canvas", I get a larger image that the one I''m
getting.



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On 19 September 2010 15:29, Abder-Rahman Ali
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org>
wrote:
> Frederick Cheung wrote:
>> On Sep 19, 3:11�pm, Abder-Rahman Ali
<li...-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote:
>>> </canvas>
>> What''s wrong with <%= some_object.width %> ?
>>
>> Fred
>
> I tried:
>
> <canvas id="draw" height = "@dicom.height" width=
"@dicom.width">
You have to put the bits of ruby code that you want expanded inside <%= 
%>
<canvas id="draw" height = <%= @dicom.height %> width= <%=
@dicom.width %> >

Colin
> </canvas>
>
> But, I don''t the expected dimensions.
>
> As when I calculated the dimensions using this Javascript function:
>
> I found that the image width and height is 512x512, and the displayed
> image is not correct, as when I manually enter the height and width
> values in the "Canvas", I get a larger image that the one
I''m getting.
>
>
>
> --
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Colin Law wrote:
> On 19 September 2010 15:29, Abder-Rahman Ali
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org>
> wrote:
>> Frederick Cheung wrote:
>>> On Sep 19, 3:11�pm, Abder-Rahman Ali
<li...-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote:
>>>> </canvas>
>>> What''s wrong with <%= some_object.width %> ?
>>>
>>> Fred
>>
>> I tried:
>>
>> <canvas id="draw" height = "@dicom.height"
width= "@dicom.width">
> 
> You have to put the bits of ruby code that you want expanded inside <%= 
> %>
> <canvas id="draw" height = <%= @dicom.height %> width=
<%= @dicom.width
> %> >
> 
> Colin
Oh, thansk Colin, I forgot <%= %>. When I do that, I get:

 Showing 
C:/Users/Abder-Rahman/Desktop/Research/dcm/app/views/dicoms/show.html.erb 
where line #2 raised:

 is not recognized by the ''identify'' command.

Either when I write it as:

<canvas id="draw" height =
<%=-SHQqU27xyw/rDb6q1WGXCQ@public.gmane.org%> width=
<%=-Ra1/UcCEv+I@public.gmane.orgdth%> >

Or,

<canvas id="draw" height =
"<%=-SHQqU27xyw/rDb6q1WGXCQ@public.gmane.org%>" width=
"<%=-Ra1/UcCEv+JYyr/e4s2GkQ@public.gmane.org%>" >

What do you think?
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If this is only in the show method - one record, I assume, why not
pass the height and width as instance variables in the method call
which are then available in the view?

On Sep 19, 10:11 am, Abder-Rahman Ali
<li...-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org>
wrote:
> radhames brito wrote:
> > show the code where you are trying to access, ill see whats wrong with
> > it
>
> Thanks @radhames.
>
> The main issue is how to make a call to the height() and width() methods
> in the model in this line in "show.html.erb":
>
> <canvas id="draw" height = "?????" width=
"?????">
> </canvas>
>
> This is my model"dicom.rb":
>
> class Dicom < ActiveRecord::Base
>   has_attached_file :photo, :styles => {
>   :original => ["100%", :jpg],
>   }
>
>   def height()
>   uploaded_file = photo.queued_for_write[:original]
>   dimensions = Paperclip::Geometry.from_file(uploaded_file)
>   return dimensions.height
> end
>
>   def width()
>   uploaded_file = photo.queued_for_write[:original]
>   dimensions = Paperclip::Geometry.from_file(uploaded_file)
>   return dimensions.width
>   end
> end
>
> And, this is my "show.html.erb":
>
> <%= javascript_include_tag "coordinate" %>
> <canvas id="draw" height = "" width=
"">
> </canvas>
> <p id="notice"><%= notice %></p>
> <p>
> <b> Name </b>
> <%= @dicom.name %>
> </p>
> <p>
> <b> Image </b>
> </p>
> <div id="image_element" style="display: none;">
> <p>
> <%= image_tag @dicom.photo.url , :id =>
''dicom_image'' %>
> </p>
> </div>
> <%= update_page_tag do |page|
> page << "drawImg();"
> end
> %>
> <%= update_page_tag do |page|
> page << "drawLine();"
> end
> %>
> <%= link_to ''Edit'', edit_dicom_path(@dicom) %>
> <%= link_to ''Back'', dicoms_path %>
>
> Thanks a lot.
> --
> Posted viahttp://www.ruby-forum.com/.
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Bb Serviss wrote:
> If this is only in the show method - one record, I assume, why not
> pass the height and width as instance variables in the method call
> which are then available in the view?
Thanks @Bb. How do you think this can be done?

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ok, im back.

 has_attached_file :photo, :styles => {  :original => ["100%",
:jpg],  }
<=== this here is incomplete and is you are only having the original

image there is no need to specify the style, and paperclip

wont convert the image to jpg, also is not good to put

convertion in the same thread as the main app.


 def height()
 uploaded_file = photo.queued_for_write[:original]
 dimensions = Paperclip::Geometry.from_file(uploaded_file)         <==== is
better to save the image in a specific size by doing
 return
dimensions.height
:styles=>{:small=>"150x150>",:big=>"900x900>"}
end

 def width()
 uploaded_file = photo.queued_for_write[:original]
 dimensions = Paperclip::Geometry.from_file(uploaded_file)         <==== is
better to save the image in a specific size by doing
 return
dimensions.width
:styles=>{:small=>"150x150>",:big=>"900x900>"}
 end
end


them you always know the correct size, but anyway your question is wrong as
this has nothing to do with models, your height() are unnecesary as you
should just save the width and height on the save event as properties.

add width and hieght as fields of the table.

def before_save
   baunds = Paperclip::geometry.from_file(uploaded_file(:original))

    width = bounds.width
    height = bounds.height
end


then instanciate and object and call the properties from it

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" is not recognized by the ''identify'' command."


you are running the paperclip on windows , you have to hack it so that the
command can be executed by the cmd.exe

in this branch is suppose to be fixed

http://github.com/ghazel/paperclip.git

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radhames brito wrote:
> " is not recognized by the ''identify'' command."
> 
> 
> you are running the paperclip on windows , you have to hack it so that 
> the
> command can be executed by the cmd.exe
> 
> in this branch is suppose to be fixed
> 
> http://github.com/ghazel/paperclip.git
I think the link is broken?
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Thanks @radhames for your thorough explanation.

I still have the same issue. I think I may have a problem in making an 
instantiation.

My model now is as follows:

class Dicom < ActiveRecord::Base
  has_attached_file :photo, :styles => {
  :original => ["100%", :jpg],
  }

  def before_save
  uploaded_file = photo.queued_for_write[:original]
  dimensions = Paperclip::Geometry.from_file(uploaded_file)
  height = dimensions.height
  width = dimensions.width
  end
end

And, I have done this in "show.html.erb":

<canvas id="draw" height="<%=@dicom.height%>"
width="<%=@dicom.width%>" 
>
What am I missing?

Thanks a lot.
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did you created the fields in the database? do that and it should work

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and dont forget to add height and  width to the attr_accessible list and fix
this

height = dimensions.height
 width = dimensions.width

to

 self.height = dimensions.height
  self.width = dimensions.width


also you can remove the style from

has_attached_file :photo, :styles => {
 :original => ["100%", :jpg] ,
 }


to

has_attached_file :photo



and you have an extra comma that does not goes there


at the end it should look similar to this


has_attached_file :image,
    :url  =>
"/system/assets/images/:id/:style/:basename.:extension",
    :path =>
":rails_root/public/system/assets/images/:id/:style/:basename.:extension"
  validates_attachment_presence :image
  validates_attachment_size :image, :less_than=> 800.kilobytes
  validates_attachment_content_type :image, :content_type => %r{image/.*}

the red charactesr means you should but the size you want there, you can
remove

validates_attachment_size :image, :less_than=> 800.kilobytes

if you dont want to set a limit.



/*********************************/

my replies  have many typos , some time i write   ''user''
instead of ''used''
and ''is'' instead of ''if''
you may want to check that in case something is not clear

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radhames brito wrote:
> did you created the fields in the database? do that and it should work
Yes, I have created the fields in the database as follows:
> rails script generate migration AddWidthToDicom width:integer
And,
> rails script generate migration AddHeightToDicom height:integer
But, still the same.
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sorry im an idiot


def after_save
  uploaded_file = photo.queued_for_write[:original]
 dimensions = Paperclip::Geometry.from_file(uploaded_file)
  height = dimensions.height
 width = dimensions.width
 end
end


is after save not before, in the before
Paperclip::Geometry.from_file(uploaded_file) does not exist


On Sun, Sep 19, 2010 at 1:52 PM, Abder-Rahman Ali
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org>wrote:
> radhames brito wrote:
> > did you created the fields in the database? do that and it should work
>
> Yes, I have created the fields in the database as follows:
>
> > rails script generate migration AddWidthToDicom width:integer
>
> And,
>
> > rails script generate migration AddHeightToDicom height:integer
>
> But, still the same.
> --
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let me go check that because rigth now im telling you everything from
memory, ill go see the right way to do it and the reply to you

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Can you wait a while ? im going to make an example project but instead of
use dicom image ill use a normal image, i will upload the project to github
so you can check it out. ok?

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radhames brito wrote:
> Can you wait a while ? im going to make an example project but instead 
> of
> use dicom image ill use a normal image, i will upload the project to 
> github
> so you can check it out. ok?
@radhames, sure, that sounds great.

I really appreciate your efforts.

Looking forward for your example.
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i just had lunch, and im going to take a nap after that ill work on it

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radhames brito wrote:
> i just had lunch, and im going to take a nap after that ill work on it
Take your time @radhames.

Thanks a lot. :-)
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On 19 September 2010 18:52, Abder-Rahman Ali
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org>
wrote:
> radhames brito wrote:
>> did you created the fields in the database? do that and it should work
>
> Yes, I have created the fields in the database as follows:
>
>> rails script generate migration AddWidthToDicom width:integer
>
> And,
>
>> rails script generate migration AddHeightToDicom height:integer
>
> But, still the same.
Did you run the migrations?
rake db:migrate

Colin

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Colin Law wrote:
> On 19 September 2010 18:52, Abder-Rahman Ali
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org>
> wrote:
>>
>> But, still the same.
> 
> Did you run the migrations?
> rake db:migrate
> 
> Colin
Yes, I did.
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radhames brito wrote:
> i just had lunch, and im going to take a nap after that ill work on it
Hi @radhames. Have you built up the application yet?

Thanks.
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not done yet be ready in an hour, i just arrive at work and have to install
rails 3 in this machine, can you wait?

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radhames brito wrote:
> not done yet be ready in an hour, i just arrive at work and have to 
> install
> rails 3 in this machine, can you wait?
Sure, @radhames. That''s fine.
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its done im gona upload it to github now, is very basic , tell me any
features you wan added, by tomorrow ill add tooltip and other cool thing,
also tell me if you want to  have galleries per user.

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radhames brito wrote:
> its done im gona upload it to github now, is very basic , tell me any
> features you wan added, by tomorrow ill add tooltip and other cool 
> thing,
> also tell me if you want to  have galleries per user.
Thanks a lot @radhames. Appreciate it.

Can you give us the link to github?
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http://github.com/rbritom/Images_handling_examples

sorry was uploading and setting up this pc to work with github

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there is an error where in the show action it should say width and height
and is saiy width and width again

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radhames brito wrote:
> http://github.com/rbritom/Images_handling_examples
> 
> sorry was uploading and setting up this pc to work with github
Thanks a lot @radhames. That''s fine.

Really helpful.
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i screwed up my rsa key and i cant update from this pc, ill fix everything
when i get home.

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radhames brito wrote:
> i screwed up my rsa key and i cant update from this pc, ill fix 
> everything
> when i get home.
That''s fine. Appreciate your efforts.
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