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Babak bsn

2011-Aug-19 08:12 UTC

Problem while creating a new record

Hi experts
I tried to save data in my Database in RoR but i could not do that.No
Error occured but i had no success to save data.hier is my codes:
in my Controller:

class VorlesungsController < ApplicationController
  def new
         @vr=Vorlesung.new
  end

  def create
    @vorlesung=Vorlesung.create(params[:vr])
    if @vorlesung.save
      flash[:notice]=''ABC''
      render :action => ''index''
    else
      flash[:notice]=''DEF ''
      render :action => ''index''
    end
  end
end

My View:

<%= form_for :vorlesung do |v| %>
    Name : <%= v.text_field :Name %>    <br>
    Name de Professur : <%= v.text_field :Leiter_name %><br>
    <%= v.submit ''Speicher''%>

<% end %>


i think that my Form_for is not in correct form because when i delete
create function from the controller everythings is as before and when i
changed :vorlesung in Form_for to @vr an error occured :
                              NoMethodError in Vorlesungs#new
Thank you for your help

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Michael Pavling

2011-Aug-19 08:28 UTC

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Re: Problem while creating a new record

On 19 August 2011 09:12, Babak bsn
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org>
wrote:>  def new
>         @vr=Vorlesung.new
>  end
Change that to:
    @vorlesung=Vorlesung.new


And see what effect that has.

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Babak bsn

2011-Aug-19 09:48 UTC

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Re: Problem while creating a new record

Thank you Michael ,

I did it  but everythings remains as before
when i changed  Form_for into
  <%= form_for @vorlesung do |v| %>
an error like this occured:
   NoMethodError in Vorlesungs#new
when Form_for remains as:
  <%= form_for :vorlesung do |v| %>
after clicking my submit button only the content of textboxes deleted 
and no other effect

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7stud --

2011-Aug-19 10:09 UTC

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Re: Problem while creating a new record

Babak bsn wrote in post #1017477:> Thank you Michael ,
>
> I did it  but everythings remains as before
> when i changed  Form_for into
>   <%= form_for @vorlesung do |v| %>
> an error like this occured:
>    NoMethodError in Vorlesungs#new
> when Form_for remains as:
>   <%= form_for :vorlesung do |v| %>
> after clicking my submit button only the content of textboxes deleted
> and no other effect

Post more of the error message, and any code in the error message.

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Babak bsn

2011-Aug-19 10:15 UTC

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Re: Problem while creating a new record

NoMethodError in Vorlesungs#new

Showing /home/babak/Management/app/views/vorlesungs/new.erb where line 
#1 raised:

undefined method `vorlesungs_path'' for
#<#<Class:0xb6009cfc>:0xb6008f3c>
Extracted source (around line #1):

1: <%= form_for @vorlesung do |v| %>
2:     Name : <%= v.text_field :Name %>    <br>
3:     Name de Professur : <%= v.text_field :Leiter_name %><br>
4:     <%= v.submit ''Speicher''%>
Rails.root: /home/babak/Management


this error occured when my new.html.erb is:
<%= form_for @vorlesung do |v| %>
    Name : <%= v.text_field :Name %>    <br>
    Name de Professur : <%= v.text_field :Leiter_name %><br>
    <%= v.submit ''Speicher''%>

<% end %>

and my controller is:


class VorlesungsController < ApplicationController
  def new
         @vorlesung=Vorlesung.new
  end

 def create
    @vorlesung=Vorlesung.create(params[:vorlesung])
    if @vorlesung.save
       @status_message = ''Student inserted successfully.''
    else
      render ''new''
    end
  end
end

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7stud --

2011-Aug-19 10:36 UTC

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Re: Problem while creating a new record

> i think that my Form_for is not in correct form because when i
> delete create function from the controller everythings is as
> before and when i changed :vorlesung in Form_for to @vr
> an error occured :
This looks wrong:

  def create
     @vorlesung=Vorlesung.create(params[:vr])

What the hell is :vr?

What version of rails are you using?  In rails 3, you would write:


<%= form_for(@vorlesung) do |v| %>

    Name : <%= v.text_field :name, "Name:" %>    <br>

    Name de Professur : <%= v.text_field :leiter_name, "Leiter
name:"
%><br>

    <%= v.submit ''Speicher''%>

<% end %>


==
With that form, rails will create name attributes for your html elements
like this:

    name="vorlesung[name]"
    name="vorlesung[leiter_name]"

You can verify that by doing "View Source'' in your browser after
the
page loads.  So the name of the form_for() variable, e.g. @vorlesung,
because the first part of the name attribute, and the symbol you
specified for the html element, e.g. :name, becomes the subscript.  As a
result, in your controller you can get a hash of the all the name
attributes and the corresponding values entered into the form, like
this:

@attributes = params[:vorlesung]

which will look something like this:

{ :name => ''Joe'', :leiter_name =>
''Blow'' }


Therefore, in your controller you can do this:

  def create
    @vorlesung =  Vorlesung.new(params[:vorlesung])

    if @vorlesung.save
       ...

  end

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7stud --

2011-Aug-19 10:45 UTC

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Re: Problem while creating a new record

Babak bsn wrote in post #1017480:> NoMethodError in Vorlesungs#new
>
> Showing /home/babak/Management/app/views/vorlesungs/new.erb where line
> #1 raised:
>
> undefined method `vorlesungs_path'' for
#<#<Class:0xb6009cfc>:0xb6008f3c>
> Extracted source (around line #1):
>
I think that means you did not define the proper route in your 
config/routes.rb file.   If you do this in your routes.rb file:

SampleApp::Application.routes.draw do

  resources :vorlesung


then rails defines a lot of what are called ''named routes'' for
you.
Read this:

http://guides.rubyonrails.org/routing.html

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Babak bsn

2011-Aug-19 11:18 UTC

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Re: Problem while creating a new record

Thank you friends,that has been solved

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