Rails - Jan 2006 - Inspect

I am seeing a curious anomaly with the inspect method. It displays one 
of the objects in a way I don''t understand. I''ll use the
Recipes example
to illustrate.

First, I''ll describe the recipes table, then show how the @recipe 
variable is being created in the controller and passed in to the show 
view, and then show how I''m using the ''inspect''
method to display the
@recipe object.

mysql> describe recipes;
+--------------+--------------+------+-----+---------+----------------+
| Field        | Type         | Null | Key | Default | Extra          |
+--------------+--------------+------+-----+---------+----------------+
| id           | int(11)      | NO   | PRI | NULL    | auto_increment |
| title        | varchar(255) | NO   |     |         |                |
| instructions | text         | YES  |     | NULL    |                |
| description  | varchar(255) | YES  |     | NULL    |                |
| date         | date         | YES  |     | NULL    |                |
| category_id  | int(6)       | YES  |     | NULL    |                |
+--------------+--------------+------+-----+---------+----------------+


In class RecipeController:
	def show
	    @recipe = Recipe.find(params[:id])
	end

In show.rhtml:
     <% @recipe.inspect.split('','').each do |object| %>
     <%= object %><br>
     <% end %>

Now, for a particular instance, this displays the following on the web 
page for the show view:

     #"Killer Mushrooms"
     "date"=>"2006-01-11"
     "id"=>"3"
     "category_id"=>"1"
     "description"=>"Last one you''ll ever need"
     "instructions"=>" Serve randomly collected forest
mushrooms"}>

Note the first line. That is the "title" column. WHy is it displayed
as
#"Killer Mushrooms" instead of "title"=>"Killer
Mushrooms" ??

Now, if I include the following in show.rhtml:

     title = <%= @recipe.title %><br>

then this is displayed:

     title = Killer Mushrooms

So clearly the object contains the ''title'' method.

Can anybody help me understand why this object being displayed by 
''inspect'' in this way?

(PS: The tokenization performed by the split has no effect, the same 
thing is displayed if it is not tokenized, just all on the same line.)

- Paint me Curious (Ruby)


-- 
Posted via http://www.ruby-forum.com/.

2006/1/18, dr plutes <pluto1@gmail.com>:
> Can anybody help me understand why this object being displayed by
> ''inspect'' in this way?
Did you know about debug ?

<%= debug(@recipe) %>

Also, if you view source, what do you see ?  Because inspect will return:

<#0x39801 Recipe...

as the first token.

Bye !
--
Fran?ois Beausoleil
http://blog.teksol.info/

> Now, for a particular instance, this displays the following on the web 
> page for the show view:
> 
>      #"Killer Mushrooms"
>      "date"=>"2006-01-11"
>      "id"=>"3"
>      "category_id"=>"1"
>      "description"=>"Last one you''ll ever
need"
>      "instructions"=>" Serve randomly collected forest
mushrooms"}>
> 
What does the HTML for this look like?

-- 
Posted via http://www.ruby-forum.com/.

Simple HTML display issue.

Too bad this forum doesn''t allow poster to delete own posts, sorry!

-- 
Posted via http://www.ruby-forum.com/.

> ...if you view source, what do you see ?  Because inspect will 
> return:
> 
> <#0x39801 Recipe...
> 
> as the first token.
Thanks!

Indeed, when I do a puts to the console, I see displayed there the 
following:

#<Recipe:0x37c31a8 @attributes={"title"=>"Killer
Mushrooms",
"date"=>"2006-01-11", "id"=>"3",
"category_id"=>"1",
"description"=>"Last one you''ll ever need",
"instructions"=>" Serve
randomly collected forest mushrooms"}>

And as a result, the following string:
<Recipe:0x38af620 @attributes={"title"=>
ends up being ''invisible''.

> Did you know about debug ?
> 
> <%= debug(@recipe) %>
Double thanks!  Much appreciated

-- 
Posted via http://www.ruby-forum.com/.

At 1/18/2006 03:33 PM, you wrote:
>In show.rhtml:
>      <% @recipe.inspect.split('','').each do |object|
%>
>      <%= object %><br>
>      <% end %>
<%=h object %><
if you html_escape() it so that you don''t have "<title
..." perhaps
it will be better

-Rob

Rob Biedenharn wrote:
> At 1/18/2006 03:33 PM, you wrote:
>>In show.rhtml:
>>      <% @recipe.inspect.split('','').each do
|object| %>
>>      <%= object %><br>
>>      <% end %>
> 
> <%=h object %><
> if you html_escape() it so that you don''t have "<title
..." perhaps
> it will be better
> 
> -Rob
Indeed - that does the trick. Thanks!

Does the <%=h object %> display the contents of any object
''as-is''
without its contents being confused by the browser to be a tag or other 
html element?


-- 
Posted via http://www.ruby-forum.com/.

At 1/18/2006 06:46 PM, you wrote:
>Rob Biedenharn wrote:
> > At 1/18/2006 03:33 PM, you wrote:
> >>In show.rhtml:
> >>      <% @recipe.inspect.split('','').each do
|object| %>
> >>      <%= object %><br>
> >>      <% end %>
> >
> > <%=h object %><
> > if you html_escape() it so that you don''t have
"<title ..." perhaps
> > it will be better
> >
> > -Rob
>
>Indeed - that does the trick. Thanks!
>
>Does the <%=h object %> display the contents of any object
''as-is''
>without its contents being confused by the browser to be a tag or other
>html element?
h is short for html_escape and Ruby lets you skip the ()''s when you 
don''t need them, so the short answer is:
Yes.

Any time you have content that could be taken the wrong way by the 
browser, use html_escape:

<%= html_escape(object) %>

but you''re much more likely to see (and do)

<%=h object %>

-Rob 
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
http://wrath.rubyonrails.org/pipermail/rails/attachments/20060118/46fc7b98/attachment.html