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ryan

2006-Nov-01 05:17 UTC

Displaying images in Ruby

I''m trying to show an image that is associated with a house. 
It''s
crashing on the houses that do not have images associated with them. 
Here''s my code:

<% if @house.picture_id != nil %>
        <div class="blank-image">Image Goes Here</div>
        Upload: <%= file_field("picture", "picture")
%>
<% else %>
        <%= image_tag(url_for(
          :controller => "picture_admin",
          :action => "show",
          :id => @picture.id),
          :alt => @picture.name,
          :class => "admin-img-preview") %>
<% end %>

I''ve also tried the following:

<% if !@house.picture %>
<% if @house.picture_id.nil? %>
<% if @house.picture_id != 0 %>
...

I''m out of ideas!  Please tell me how I can show this for houses that
do
not have images.  Thanks!

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_Kevin

2006-Nov-01 05:38 UTC

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Re: Displaying images in Ruby

ryan wrote:> I''m trying to show an image that is associated with a house. 
It''s
> crashing on the houses that do not have images associated with them.
> Here''s my code:
>
> <% if @house.picture_id != nil %>
>         <div class="blank-image">Image Goes
Here</div>
>         Upload: <%= file_field("picture", "picture")
%>
> <% else %>
>         <%= image_tag(url_for(
>           :controller => "picture_admin",
>           :action => "show",
>           :id => @picture.id),
>           :alt => @picture.name,
>           :class => "admin-img-preview") %>
> <% end %>
>
> I''ve also tried the following:
>
> <% if !@house.picture %>
> <% if @house.picture_id.nil? %>
> <% if @house.picture_id != 0 %>
> ...
>
> I''m out of ideas!  Please tell me how I can show this for houses
that do
> not have images.  Thanks!
>
> --
> Posted via http://www.ruby-forum.com/.
If I read your code correctly, it looks like you want to trap @houses
without pictures in the first part of your conditional.

Try this...
<% unless @house.picture_id %>
 do stuff for houses without pictures
<% else %>
 do stuff for houses with pictures
<% end %>

_Kevin


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Frederick Cheung

2006-Nov-01 09:52 UTC

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Re: Displaying images in Ruby

file_field (like text_field, check_box) and so on assume that its first 
parameter is the name of a instance variable and the second the name of 
a method that can be called on that instance variable.

So here file_field will try to do @picture.picture, which i''m assuming 
fails because @picture is nil.
You probably want something like file_field("house", picture)  (or 
possibly you just want to use file_field_tag)

Fred

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ryan

2006-Nov-01 13:27 UTC

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Re: Displaying images in Ruby

Frederick Cheung wrote:> file_field (like text_field, check_box) and so on assume that its first 
> parameter is the name of a instance variable and the second the name of 
> a method that can be called on that instance variable.
> 
> So here file_field will try to do @picture.picture, which i''m
assuming
> fails because @picture is nil.
> You probably want something like file_field("house", picture) 
(or
> possibly you just want to use file_field_tag)
> 
> Fred
Ok, thanks.  I''ll try that this evening.  Just for more information, I 
have a PICTURES table and a HOUSES table.  The HOUSES table has a 
foreign key of "picture_id" to the pictures table.  When I''m
saving the
fields for a new house, I''m using the file_field to browse for an
image.
Then, in the "create" method in my house_controller I''m
using:

@house = House.new(params[:house])
@picture = Picture.new(params[:picture])
if @picture.save
  @house.picture_id = @picture.id
end
#...
#continue with @house processing...

Everything works fine, except when I try to call "/house/edit/1" when 
the house entry for id of 1 does not have a picture with it.  So I 
thought by using "@house.picture_id" I could check that field to see
if
it was empty, and if it was, display the "file_field" again.  Does
your
reply still apply now that you know how I''m doing things?  Is there a 
way to check for a null "picture_id" field, and show a file_field to 
upload an image if so?  Thanks!

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ryan

2006-Nov-01 13:30 UTC

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Re: Displaying images in Ruby

Also, I''m using "has_one" and "belongs_to" as my
model relationships
between HOUSES and PICTURES, just so you know.  Thanks.

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Frederick Cheung

2006-Nov-01 15:32 UTC

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Re: Displaying images in Ruby

First of all, I was reading a little hastily this morning, and actually 
file_field is a little different to the other blah_field helpers - the 
others use the parameters to get the current value of the attribute as 
their default, which file_field doesn''t, so
file_field("picture",
"picture") shouldn''t really care about the actual value of
@picture

Yes, you can use house.picture_id or house.picture to tell if a house 
does or does not have a picture; however given that you then go on to 
use @picture, the most intuitive thing for me would be <% if @picture %>

What would really be helpful too, is the exact error that you get on the 
page.

Fred

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ryan

2006-Nov-01 16:18 UTC

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Re: Displaying images in Ruby

Frederick Cheung wrote:> First of all, I was reading a little hastily this morning, and actually 
> file_field is a little different to the other blah_field helpers - the 
> others use the parameters to get the current value of the attribute as 
> their default, which file_field doesn''t, so
file_field("picture",
> "picture") shouldn''t really care about the actual value
of @picture
> 
> Yes, you can use house.picture_id or house.picture to tell if a house 
> does or does not have a picture; however given that you then go on to 
> use @picture, the most intuitive thing for me would be <% if @picture
%>
> 
> What would really be helpful too, is the exact error that you get on the 
> page.
> 
> Fred
Ok, thanks.  I''ll post the exact error when I get home from work this 
evening.

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ryan

2006-Nov-01 21:45 UTC

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Re: Displaying images in Ruby

Ok, here''s the error I get:

Couldn''t find Picture without an ID

RAILS_ROOT: ./script/../config/..
Application Trace | Framework Trace | Full Trace

c:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/base.rb:939:in
`find_from_ids''
c:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/base.rb:382:in
`find''
#{RAILS_ROOT}/app/controllers/house_admin_controller.rb:51:in `edit''
-e:4:in `load''
-e:4

c:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/base.rb:939:in
`find_from_ids''
c:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/base.rb:382:in
`find''
c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/base.rb:941:in
`send''
c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/base.rb:941:in
`perform_action_without_filters''
c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/filters.rb:368:in
`perform_action_without_benchmark''
c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/benchmarking.rb:69:in
`perform_action_without_rescue''
c:/ruby/lib/ruby/1.8/benchmark.rb:293:in `measure''
c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/benchmarking.rb:69:in
`perform_action_without_rescue''
c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/rescue.rb:82:in
`perform_action''
c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/base.rb:408:in
`send''
c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/base.rb:408:in
`process_without_filters''
c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/filters.rb:377:in
`process_without_session_management_support''
c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/session_management.rb:117:in
`process''
c:/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/dispatcher.rb:38:in 
`dispatch''
c:/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/webrick_server.rb:115:in 
`handle_dispatch''
c:/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/webrick_server.rb:81:in 
`service''
c:/ruby/lib/ruby/1.8/webrick/httpserver.rb:104:in `service''
c:/ruby/lib/ruby/1.8/webrick/httpserver.rb:65:in `run''
c:/ruby/lib/ruby/1.8/webrick/server.rb:173:in `start_thread''
c:/ruby/lib/ruby/1.8/webrick/server.rb:162:in `start''
c:/ruby/lib/ruby/1.8/webrick/server.rb:162:in `start_thread''
c:/ruby/lib/ruby/1.8/webrick/server.rb:95:in `start''
c:/ruby/lib/ruby/1.8/webrick/server.rb:92:in `each''
c:/ruby/lib/ruby/1.8/webrick/server.rb:92:in `start''
c:/ruby/lib/ruby/1.8/webrick/server.rb:23:in `start''
c:/ruby/lib/ruby/1.8/webrick/server.rb:82:in `start''
c:/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/webrick_server.rb:67:in 
`dispatch''
c:/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/commands/servers/webrick.rb:59
c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in 
`gem_original_require''
c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in 
`require''
c:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:147:in
`require''
c:/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/commands/server.rb:30
c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in 
`gem_original_require''
c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in 
`require''
c:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:147:in
`require''
script/server:3

c:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/base.rb:939:in
`find_from_ids''
c:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/base.rb:382:in
`find''
#{RAILS_ROOT}/app/controllers/house_admin_controller.rb:51:in `edit''
c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/base.rb:941:in
`send''
c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/base.rb:941:in
`perform_action_without_filters''
c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/filters.rb:368:in
`perform_action_without_benchmark''
c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/benchmarking.rb:69:in
`perform_action_without_rescue''
c:/ruby/lib/ruby/1.8/benchmark.rb:293:in `measure''
c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/benchmarking.rb:69:in
`perform_action_without_rescue''
c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/rescue.rb:82:in
`perform_action''
c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/base.rb:408:in
`send''
c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/base.rb:408:in
`process_without_filters''
c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/filters.rb:377:in
`process_without_session_management_support''
c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/session_management.rb:117:in
`process''
c:/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/dispatcher.rb:38:in 
`dispatch''
c:/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/webrick_server.rb:115:in 
`handle_dispatch''
c:/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/webrick_server.rb:81:in 
`service''
c:/ruby/lib/ruby/1.8/webrick/httpserver.rb:104:in `service''
c:/ruby/lib/ruby/1.8/webrick/httpserver.rb:65:in `run''
c:/ruby/lib/ruby/1.8/webrick/server.rb:173:in `start_thread''
c:/ruby/lib/ruby/1.8/webrick/server.rb:162:in `start''
c:/ruby/lib/ruby/1.8/webrick/server.rb:162:in `start_thread''
c:/ruby/lib/ruby/1.8/webrick/server.rb:95:in `start''
c:/ruby/lib/ruby/1.8/webrick/server.rb:92:in `each''
c:/ruby/lib/ruby/1.8/webrick/server.rb:92:in `start''
c:/ruby/lib/ruby/1.8/webrick/server.rb:23:in `start''
c:/ruby/lib/ruby/1.8/webrick/server.rb:82:in `start''
c:/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/webrick_server.rb:67:in 
`dispatch''
c:/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/commands/servers/webrick.rb:59
c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in 
`gem_original_require''
c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in 
`require''
c:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:147:in
`require''
c:/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/commands/server.rb:30
c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in 
`gem_original_require''
c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in 
`require''
c:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:147:in
`require''
script/server:3
-e:4:in `load''
-e:4

Request

Parameters: {"id"=>"7"}



The "id" => "7" corresponds to the url
/house_admin/edit/7 (which is the
ID for the house entry).  Hopefully you can help!  Thanks!

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ryan

2006-Nov-01 22:18 UTC

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Re: Displaying images in Ruby

I fixed it... thanks for the efforts anyway!

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Ma Lijun

2006-Nov-02 01:41 UTC

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Re: Displaying images in Ruby

ryan wrote:> I fixed it... thanks for the efforts anyway!
Can you give the resolution?

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ryan

2006-Nov-02 03:16 UTC

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Re: Displaying images in Ruby

Ma Lijun wrote:> ryan wrote:
>> I fixed it... thanks for the efforts anyway!
> 
> Can you give the resolution?
It was ignorance on my part for not checking for the @house.picture_id 
in the controller BEFORE attempting to setup the @picture object.  So 
this is what I did:

if @house.picture_id != nil
  @picture = Picture.find(@house.picture_id)
end

That worked like a charm.  Thanks for all the help.  However, if you 
don''t mind, can you help me with another problem?  I was debating
saving
to the database vs. a filesystem, and was trying to get the filesystem 
to work by doing this:

@house = House.new(params[:house])
@filename = @params[:picture][:picture].original_filename
File.open("#{RAILS_ROOT}/public/images/#{@filename}", "wb")
do |f|
  f.write(@params[:picture][:picture].read)
end

That works, but it writes a "0kb" file to the directory.  How can I
get
it to actually put the file data there???  Thanks for any advice.

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Alex Wayne

2006-Nov-02 08:38 UTC

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Re: Displaying images in Ruby

ryan wrote:> Ma Lijun wrote:
>> ryan wrote:
>>> I fixed it... thanks for the efforts anyway!
>> 
>> Can you give the resolution?
> 
> It was ignorance on my part for not checking for the @house.picture_id 
> in the controller BEFORE attempting to setup the @picture object.  So 
> this is what I did:
> 
> if @house.picture_id != nil
>   @picture = Picture.find(@house.picture_id)
> end
> 
> That worked like a charm.  Thanks for all the help.  However, if you 
> don''t mind, can you help me with another problem?  I was debating
saving
> to the database vs. a filesystem, and was trying to get the filesystem 
> to work by doing this:
> 
> @house = House.new(params[:house])
> @filename = @params[:picture][:picture].original_filename
> File.open("#{RAILS_ROOT}/public/images/#{@filename}",
"wb") do |f|
>   f.write(@params[:picture][:picture].read)
> end
> 
> That works, but it writes a "0kb" file to the directory.  How can
I get
> it to actually put the file data there???  Thanks for any advice.
I highly recommend the FlexImage plugin for this, and not just because I 
wrote it.

http://beautifulpixel.com/flex_image/index.html

With FlexImage in charge of your Picture model, you can have it read and 
write the binary data either to the database or to disk or the very 
easily.  Uploads and binary data storage are all handled for you without 
any complicated code.

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karma_guru

2006-Nov-02 17:49 UTC

head link

Re: Displaying images in Ruby

I use a similar piece of code that checks for the existence of an image
filename. My if statement translated into your code would look like:

<% if @house.picture_id? %>
      <h1> I have a picture id! </h1>
<% else %>
      <h1> Darn it - no picture id, better place a generic image
here... </h1>

I hope this helps,

Paul


ryan wrote:> I''m trying to show an image that is associated with a house. 
It''s
> crashing on the houses that do not have images associated with them.
> Here''s my code:
>
> <% if @house.picture_id != nil %>
>         <div class="blank-image">Image Goes
Here</div>
>         Upload: <%= file_field("picture", "picture")
%>
> <% else %>
>         <%= image_tag(url_for(
>           :controller => "picture_admin",
>           :action => "show",
>           :id => @picture.id),
>           :alt => @picture.name,
>           :class => "admin-img-preview") %>
> <% end %>
>
> I''ve also tried the following:
>
> <% if !@house.picture %>
> <% if @house.picture_id.nil? %>
> <% if @house.picture_id != 0 %>
> ...
>
> I''m out of ideas!  Please tell me how I can show this for houses
that do
> not have images.  Thanks!
> 
> -- 
> Posted via http://www.ruby-forum.com/.

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Rails - Nov 2006 - Displaying images in Ruby

Displaying images in Ruby

Re: Displaying images in Ruby

Re: Displaying images in Ruby

Re: Displaying images in Ruby

Re: Displaying images in Ruby

Re: Displaying images in Ruby

Re: Displaying images in Ruby

Re: Displaying images in Ruby

Re: Displaying images in Ruby

Re: Displaying images in Ruby

Re: Displaying images in Ruby

Re: Displaying images in Ruby

Re: Displaying images in Ruby