Problem while creating a new record

Rails
1

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 %>

Name de Professur : <%= v.text_field :Leiter_name %>

<%= 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

2

On 19 August 2011 09:12, Babak bsn [email protected] wrote:

def new
@vr=Vorlesung.new
end

Change that to:
@vorlesung=Vorlesung.new

And see what effect that has.

3

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.

4

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

5

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 %>

3: Name de Professur : <%= v.text_field :Leiter_name %>

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 %>

Name de Professur : <%= v.text_field :Leiter_name %>

<%= 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

6

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.
vorlesungs_path is one of the named routes rails creates for you. I
think form_for(@vorlesung) automatically uses vorlesungs_path for the
action attribute of the form, which is the url the form is submitted to.
Read this:

7

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:"

%>

<%= 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

8

Thank you friends,that has been solved