Rails - Dec 2006 - Comment forms and URLs

Hi all,

Just started with Rails a couple weeks ago after a few years doing PHP.
I''ve got a blog going with URLS like

/blog/2006/12/13/entry_title

and each entry has a comment form and the end. This form calls an
action ''add_comment'' in the ''blog''
controller, with the URL

/blog/add_comment

I was wondering whether it''s possible for users to arrive back at the
first URL for the entry after trying to post a comment? Using
redirect_to with the entry''s route means I can''t use
error_messages_for
on the comment in my entry''s view. So instead, I''m just doing
@comment.save etc in blog#add_comment and then using

render :action show_entry

to show the entry the comment applies to. This retains the form values
and shows any errors produced. Can I have someone submit a comment and
be directed to

/blog/2006/12/13/entry_title

without losing the comment and its errors along the way?

Thanks,
James


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James wrote:
> 
> Hi all,
> 
[snip]
> /blog/add_comment
> 
> I was wondering whether it''s possible for users to arrive back at
the
> first URL for the entry after trying to post a comment? Using
> redirect_to with the entry''s route means I can''t use
error_messages_for
> on the comment in my entry''s view. So instead, I''m just
doing
> @comment.save etc in blog#add_comment and then using
> 
> render :action show_entry
> 
> to show the entry the comment applies to. This retains the form values
> and shows any errors produced. Can I have someone submit a comment and
> be directed to
> 
> /blog/2006/12/13/entry_title
> 
> without losing the comment and its errors along the way?
> 
In the #add_comment action, store the comment in the user session before any
validation. Use flash to communicate error messages and redirect_to should work.

You can have a look at my blog comment section to get a better idea.

Long
www.edgesoft.ca/blog/read/2 - rails articles


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Thanks for the suggestion! Just to clarify, would something like this
do the trick...

# in blog#add_comment
@comment = Comment.new(params[:comment])
@comment.valid?
flash[:comment] = @comment
redirect_to entry_url (...with parameters for URL...)

# in blog#show_entry
@comment = flash[:comment]

Will the show_entry action/view now get the contents of the comment and
@comment.errors? Does flash work or should I use session?


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> 
> Thanks for the suggestion! Just to clarify, would something like this
> do the trick...
> 
> # in blog#add_comment
> @comment = Comment.new(params[:comment])
>
You might want to store the comment in the user session. e.g
session[:comment] = @comment
> @comment.valid?
>
You would test for validity here and set flash to show any error message.
e.g. flash[:alert] = ''Missing a required field''
> flash[:comment] = @comment
> redirect_to entry_url (...with parameters for URL...)
> 
> # in blog#show_entry
> @comment = flash[:comment]
> 
You may use <% new_comment = session[:comment] %> and access each
attribute with
<%= new_comment.from %>
<%= new_comment.url %>
<%= new_comment.message%>
...etc. to display each attribute on the form.

A final note, you should initialize session[:comment] = Comment.new the first
time the form is accessed so you don''t get a nil error.

HTH,

Long
www.edgesoft.ca/blog/read/2 - rails articles


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