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Luke

2006-Oct-29 19:20 UTC

controller/view problem from RoR n00b

can anybody tell me why my controller is not creating a new comment,
but my view lists comments that i manually add to the database?

here is my view code:

	<% for comment in @post.post_comments %>
		<%= comment.body %>
		<%= comment.email_address %>
	<% end %>

	<%= form_tag :action => "comment", :id => @post %>
	<%= text_area "post_comment", "body" %><br/>
	<%= submit_tag "Comment!" %>
	</form>

and here is my controller code:

  def comment
    Post.find(params[:id]).post_comments.create(params[:post_comment])
    flash[:notice] = "Added your comment."
    redirect_to :action => "show", :id => params[:id]
  end

i have models called post and post_comment and tables called posts and
post_comments.

i don''t get any error messages and it redirects back to the appropriate
post on the show page, but the flash doesn''t work and the comment
isn''t
added.

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Jodi Showers

2006-Oct-29 19:40 UTC

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Re: controller/view problem from RoR n00b

On 29-Oct-06, at 2:20 PM, Luke wrote:>
> can anybody tell me why my controller is not creating a new comment,
> but my view lists comments that i manually add to the database?
>
> here is my view code:
>
> 	<% for comment in @post.post_comments %>
> 		<%= comment.body %>
> 		<%= comment.email_address %>
> 	<% end %>
>
> 	<%= form_tag :action => "comment", :id => @post %>
> 	<%= text_area "post_comment", "body"
%><br/>
> 	<%= submit_tag "Comment!" %>
> 	</form>
>
> and here is my controller code:
>
>   def comment
>     Post.find(params[:id]).post_comments.create(params[:post_comment])
>     flash[:notice] = "Added your comment."
>     redirect_to :action => "show", :id => params[:id]
>   end
>
> i have models called post and post_comment and tables called posts and
> post_comments.
>
> i don''t get any error messages and it redirects back to the  
> appropriate
> post on the show page, but the flash doesn''t work and the comment
> isn''t
> added.
>

Hey Luke,

your problem lies with Instance versus Class methods.

 >Post.find(params[:id]).post_comments.create(params[:post_comment])

Post.find returns an array of post instances. The instance method  
post_comments returns an array of comments instances.

The create method doesn''t belong either to a particular comment  
instance, nor to Array.

You should be calling Post.create and adjusting your params as such.

Plus if you check your development.log, you''ll likely see something  
like "create is not a method of Array". This log should be a key  
source of debugging.

J

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ljredpath-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org

2006-Oct-29 20:17 UTC

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Re: controller/view problem from RoR n00b

The above post is not correct.

Post.find only returns a single object if only one is found (i.e. when
finding by params[:id] as above).

post.post_comments is an association proxy that will return an array of
related PostComment objects *but*, you can also call methods such as
create on it as well. See the API docs for more information.


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Jodi Showers

2006-Oct-29 21:17 UTC

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Re: controller/view problem from RoR n00b

>
> The above post is not correct.
>
> Post.find only returns a single object if only one is found (i.e. when
> finding by params[:id] as above).
>
> post.post_comments is an association proxy that will return an  
> array of
> related PostComment objects *but*, you can also call methods such as
> create on it as well. See the API docs for more information.
I stand corrected. Thank you.

This is one area of the documentation (IMO) is weak . But consulting  
through irb, and .methods .instance_methods ljredpath is correct.

J

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Luke

2006-Oct-30 07:57 UTC

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Re: controller/view problem from RoR n00b

Thanks for the response. I follow you on the first part where you say
"Post.find only returns a single object if only one is found (i.e. when
finding by params[:id] as above).", but I lost you on the second part.
I will definitely check the API documentation, but I''m not sure where
to look. Can you explain the second part in a little more detail or
refer me to the proper area of the API docs?

Thanks,

Luke

ljredpath-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org wrote:> The above post is not correct.
>
> Post.find only returns a single object if only one is found (i.e. when
> finding by params[:id] as above).
>
> post.post_comments is an association proxy that will return an array of
> related PostComment objects *but*, you can also call methods such as
> create on it as well. See the API docs for more information.

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Luke

2006-Oct-30 07:58 UTC

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Re: controller/view problem from RoR n00b

Thanks for the response. I follow you on the first part where you say
"Post.find only returns a single object if only one is found (i.e. when 
finding by params[:id] as above).", but I lost you on the second part. I 
will definitely check the API documentation, but I''m not sure where to 
look. Can you explain the second part in a little more detail or refer 
me to the proper area of the API docs?

Thanks,

Luke

unknown wrote:> The above post is not correct.
> 
> Post.find only returns a single object if only one is found (i.e. when
> finding by params[:id] as above).
> 
> post.post_comments is an association proxy that will return an array of
> related PostComment objects *but*, you can also call methods such as
> create on it as well. See the API docs for more information.

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ljredpath-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org

2006-Oct-30 09:13 UTC

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Re: controller/view problem from RoR n00b

If you look at:

http://api.rubyonrails.org/classes/ActiveRecord/Associations/ClassMethods.html

You''ll see, under the section for has_many, a list of the methods
available.


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Gokhan Arli

2006-Oct-30 11:26 UTC

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Re: controller/view problem from RoR n00b

Why having a model called post_comments? If you have comments belong to 
more then 1 model then you can use Single Type Inheritance.

about
def comment
    if post = Post.find(params[:id])
        @com = post.post_comments.build(params[:post_comment])
        if @com.save
            flash[:notice] = "Added your comment."
            redirect_to :action => "show", :id => params[:id]
        end
    else
       render :text => "Cannot find post"
    end
end


And where you have your form to create comments you can have small 
section for error message to find our what goes wrong

Gokhan Arli
www.sylow.net

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Jodi Showers

2006-Oct-30 16:07 UTC

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Re: controller/view problem from RoR n00b

> If you look at:
>
> http://api.rubyonrails.org/classes/ActiveRecord/Associations/ 
> ClassMethods.html
>
> You''ll see, under the section for has_many, a list of the methods
> available.
as sure as Bob''s your uncle, I stand corrected again. I hope
I''m not
making a habit of this!

J

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Luke

2006-Oct-30 18:34 UTC

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Re: controller/view problem from RoR n00b

I''m not familiar with single type inheritance. The reason I have 
post_comments is because I also have picture_comments and I need a way 
to differentiate between the two. I''ll have to look into your
suggestion
and see if it will work for me. Thanks.

Gokhan Arli wrote:> Why having a model called post_comments? If you have comments belong to 
> more then 1 model then you can use Single Type Inheritance.
> 
> about
> def comment
>     if post = Post.find(params[:id])
>         @com = post.post_comments.build(params[:post_comment])
>         if @com.save
>             flash[:notice] = "Added your comment."
>             redirect_to :action => "show", :id =>
params[:id]
>         end
>     else
>        render :text => "Cannot find post"
>     end
> end
> 
> 
> And where you have your form to create comments you can have small 
> section for error message to find our what goes wrong
> 
> Gokhan Arli
> www.sylow.net

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Luke

2006-Oct-31 14:59 UTC

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Re: controller/view problem from RoR n00b

gokhan,

your code below doesn''t seem to be working. i suspect that i have 
something else going on. is there somewhere that i can look (a log file 
or something) to see if errors are being generated, but not displayed on 
the screen. it seems kind of odd to me that the code isn''t working, but
there is no evidence of failure.

thanks,

luke

Luke wrote:> I''m not familiar with single type inheritance. The reason I have 
> post_comments is because I also have picture_comments and I need a way 
> to differentiate between the two. I''ll have to look into your
suggestion
> and see if it will work for me. Thanks.
> 
> Gokhan Arli wrote:
>> Why having a model called post_comments? If you have comments belong to
>> more then 1 model then you can use Single Type Inheritance.
>> 
>> about
>> def comment
>>     if post = Post.find(params[:id])
>>         @com = post.post_comments.build(params[:post_comment])
>>         if @com.save
>>             flash[:notice] = "Added your comment."
>>             redirect_to :action => "show", :id =>
params[:id]
>>         end
>>     else
>>        render :text => "Cannot find post"
>>     end
>> end
>> 
>> 
>> And where you have your form to create comments you can have small 
>> section for error message to find our what goes wrong
>> 
>> Gokhan Arli
>> www.sylow.net

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Luke Pearce

2006-Oct-31 18:18 UTC

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Re: controller/view problem from RoR n00b

Luke wrote:> is there somewhere that i can look (a log file or something)
Look under /RAILSROOT/log/development.log (or production.log for
production)

Your best bet though is to try doing a breakpoint in your comment method 
and see whats actually going on...

http://wiki.rubyonrails.org/rails/pages/HowtoDebugWithBreakpoint

Cheers

Luke No 1 ;)

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Luke Borloz

2006-Oct-31 20:33 UTC

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Re: controller/view problem from RoR n00b

Thanks Luke. That should help.

Luke Pearce wrote:> Luke wrote:
>> is there somewhere that i can look (a log file or something)
> 
> Look under /RAILSROOT/log/development.log (or production.log for
> production)
> 
> Your best bet though is to try doing a breakpoint in your comment method 
> and see whats actually going on...
> 
> http://wiki.rubyonrails.org/rails/pages/HowtoDebugWithBreakpoint
> 
> Cheers
> 
> Luke No 1 ;)

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Luke Borloz

2006-Nov-01 00:55 UTC

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Re: controller/view problem from RoR n00b

ok, i started through the breakpoint tutorial above, but when i try to 
start the breakpointer using:

./script/breakpointer

from within my rails app base directory, i get:

./script/../config/boot.rb:18:in `require'': No such file to load -- 
rubygems (LoadError)
        from ./script/../config/boot.rb:18
        from script/breakpointer:2:in `require''
        from script/breakpointer:2

anyone know how to fix this?


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Luke Borloz

2006-Nov-01 01:23 UTC

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Re: controller/view problem from RoR n00b

nevermind, i got it. had to install rubygems... duh... like i said, i''m
a noobie :)

Luke Borloz wrote:> ok, i started through the breakpoint tutorial above, but when i try to 
> start the breakpointer using:
> 
> ./script/breakpointer
> 
> from within my rails app base directory, i get:
> 
> ./script/../config/boot.rb:18:in `require'': No such file to load
--
> rubygems (LoadError)
>         from ./script/../config/boot.rb:18
>         from script/breakpointer:2:in `require''
>         from script/breakpointer:2
> 
> anyone know how to fix this?

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Luke Borloz

2006-Nov-02 03:51 UTC

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Re: controller/view problem from RoR n00b

Ok, now I got the breakpointer working, but for some reason, my comments 
are still not saving.

I''m going to post everything that I have and hopefully someone will be 
able to tell me where I''m going wrong...

Here is my controller code:

  def comment
    post = Post.find(params[:id])
    @comment = post.post_comments.build(params[:post_comment])
    breakpoint
    if @comment.save
      flash[:notice] = "Added your comment."
      redirect_to :action => "show", :id => params[:id]
    else
      flash[:notice] = "Unable to save your comment."
      redirect_to :action => "show", :id => params[:id]
    end
  end

And here is what I''m getting in my log as a result:

Processing BlogController#comment (for 127.0.0.1 at 2006-11-01 22:45:25) 
[POST]
  Session ID: fc25db96c14d3bf349e3e52cbd311bcc
  Parameters:
{"post_comment"=>{"body"=>"test"},
"commit"=>"Comment!",
"action"=>"comment", "id"=>"3",
"controller"=>"blog"}
  Post Load (0.000826)   SELECT * FROM posts WHERE (posts.id =
''3'')
LIMIT 1
  Post Columns (0.006130)   SHOW FIELDS FROM posts
  PostComment Load (0.007839)   SELECT * FROM post_comments WHERE 
(post_comments.post_id = 3)
  PostComment Columns (0.020313)   SHOW FIELDS FROM post_comments
  SQL (0.000301)   BEGIN
  SQL (0.000296)   COMMIT
Redirected to http://0.0.0.0:3000/blog/show/3
Completed in 5.10297 (0 reqs/sec) | DB: 0.03571 (0%) | 302 Found 
[http://0.0.0.0/blog/comment/3]


Processing BlogController#show (for 127.0.0.1 at 2006-11-01 22:45:31) 
[GET]
  Session ID: fc25db96c14d3bf349e3e52cbd311bcc
  Parameters: {"action"=>"show",
"id"=>"3", "controller"=>"blog"}
  Post Load (0.000811)   SELECT * FROM posts WHERE (posts.id =
''3'')
LIMIT 1
Rendering  within layouts/application
Rendering blog/show
  Post Columns (0.007676)   SHOW FIELDS FROM posts
  PostComment Load (0.014388)   SELECT * FROM post_comments WHERE 
(post_comments.post_id = 3)
Completed in 0.11120 (8 reqs/sec) | Rendering: 0.07924 (71%) | DB: 
0.02288 (20%) | 200 OK [http://0.0.0.0/blog/show/3]


At the breakpoint in my above controller code, here is the value of 
@commment:

@comment
=> #<PostComment:0x26bcce4 @new_record=true, 
@attributes={"body"=>"test", "date"=>nil,
"created_by"=>nil,
"post_id"=>3, "website_address"=>nil,
"email_address"=>nil}>


Here is my post_comments table:

CREATE TABLE `post_comments` (
  `id` int(11) NOT NULL auto_increment,
  `body` text NOT NULL,
  `created_by` varchar(255) default NULL,
  `email_address` varchar(255) default NULL,
  `website_address` varchar(255) default NULL,
  `date` datetime default NULL,
  `post_id` int(11) NOT NULL,
  PRIMARY KEY  (`id`)
) ENGINE=MyISAM AUTO_INCREMENT=1 DEFAULT CHARSET=latin1 AUTO_INCREMENT=1 
;



I''m at a loss at this point. It seems like I''ve tried
everything, but
I''m sure I''m missing something minor.

Any help will be appreciated.

Thanks,

Luke

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Luke Borloz

2006-Nov-02 04:22 UTC

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Re: controller/view problem from RoR n00b

Got it now!! I had a validates_presence_of in my model for a field that 
I had deleted from the table. Anyone have any idea why rails doesn''t 
tell you when you make a dumb mistake like that??

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Craig White

2006-Nov-02 04:37 UTC

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Re: controller/view problem from RoR n00b

On Thu, 2006-11-02 at 05:22 +0100, Luke Borloz wrote:> Got it now!! I had a validates_presence_of in my model for a field that 
> I had deleted from the table. Anyone have any idea why rails
doesn''t
> tell you when you make a dumb mistake like that??----
logs are your friend

Craig


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Luke Borloz

2006-Nov-07 22:22 UTC

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Re: controller/view problem from RoR n00b

That was my question. I didn''t see it in any of my logs. It
doesn''t seem
to throw any type of error anywhere when you do this.

Craig White wrote:> On Thu, 2006-11-02 at 05:22 +0100, Luke Borloz wrote:
>> Got it now!! I had a validates_presence_of in my model for a field that
>> I had deleted from the table. Anyone have any idea why rails
doesn''t
>> tell you when you make a dumb mistake like that??
> ----
> logs are your friend
> 
> Craig

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Frederick Cheung

2006-Nov-07 22:47 UTC

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Re: controller/view problem from RoR n00b

create doesn''t raise an error when validation fails, it just returns 
false , so check those return values :-)

Fred

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Rails - Oct 2006 - controller/view problem from RoR n00b

controller/view problem from RoR n00b

Re: controller/view problem from RoR n00b

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