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amrit pal pathak

2011-Apr-25 12:58 UTC

NoMethodError in Book

I got a following error.

NoMethodError in Book#new

Showing /home/amrit/boook/app/views/book/_form.html.erb where line #1
raised:

undefined method `model_name'' for NilClass:Class



The content of _form.html.erb file are:

<%= form_for(@post) do |f| %>
  <% if @post.errors.any? %>
    <div id="error_explanation">
      <h2><%= pluralize(@post.errors.count, "error") %>
prohibited
this post from being saved:</h2>

      <ul>
      <% @post.errors.full_messages.each do |msg| %>
        <li><%= msg %></li>
      <% end %>
      </ul>
    </div>
  <% end %>

  <div class="field">
    <%= f.label :name %><br />
    <%= f.text_field :name %>
  </div>
  <div class="field">
    <%= f.label :title %><br />
    <%= f.text_field :title %>
  </div>
  <div class="field">
    <%= f.label :content %><br />
    <%= f.text_area :content %>
  </div>
  <div class="actions">
    <%= f.submit %>
  </div>
<% end %>

Any clue?
Thanks

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amrit pal pathak

2011-Apr-25 12:58 UTC

head link

NoMethodError in Book

I got a following error.

NoMethodError in Book#new

Showing /home/amrit/boook/app/views/book/_form.html.erb where line #1
raised:

undefined method `model_name'' for NilClass:Class



The content of _form.html.erb file are:

<%= form_for(@post) do |f| %>
  <% if @post.errors.any? %>
    <div id="error_explanation">
      <h2><%= pluralize(@post.errors.count, "error") %>
prohibited
this post from being saved:</h2>

      <ul>
      <% @post.errors.full_messages.each do |msg| %>
        <li><%= msg %></li>
      <% end %>
      </ul>
    </div>
  <% end %>

  <div class="field">
    <%= f.label :name %><br />
    <%= f.text_field :name %>
  </div>
  <div class="field">
    <%= f.label :title %><br />
    <%= f.text_field :title %>
  </div>
  <div class="field">
    <%= f.label :content %><br />
    <%= f.text_area :content %>
  </div>
  <div class="actions">
    <%= f.submit %>
  </div>
<% end %>

Any clue?
Thanks

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Tim Shaffer

2011-Apr-25 13:01 UTC

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Re: NoMethodError in Book

What does your controller look like? Do you define the @post variable?

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amrit pal pathak

2011-Apr-25 13:28 UTC

head link

Re: NoMethodError in Book

On Apr 25, 9:01 am, Tim Shaffer <timshaf...-BUHhN+a2lJ4@public.gmane.org>
wrote:> What does your controller look like? Do you define the @post variable?               Yes i defined it.it looks like
  class BookController < ApplicationController
  def index
  @book =Book.all
  render :index
  end
  end

Thanks

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Tim Shaffer

2011-Apr-25 13:37 UTC

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Re: NoMethodError in Book

Actually it looks like you''re not defining it in the example you
provided.

Your controller is defining a variable called @book, but your view is trying 
to reference a variable called @post. Do you have a PostsController?

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amrit pal pathak

2011-Apr-25 15:50 UTC

head link

Re: NoMethodError in Book

On Apr 25, 9:37 am, Tim Shaffer <timshaf...-BUHhN+a2lJ4@public.gmane.org>
wrote:> Actually it looks like you''re not defining it in the example you
provided.
>
> Your controller is defining a variable called @book, but your view is
trying
> to reference a variable called @post. Do you have a PostsController?             Yes it was mistake,but now i changed @post to @book.Still
same error exits
 NoMethodError in Book#new
Showing /home/amrit/boook/app/views/book/_form.html.erb where line #1
raised:
undefined method `model_name'' for NilClass:Class


          Thanks

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Colin Law

2011-Apr-25 15:59 UTC

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Re: Re: NoMethodError in Book

On 25 April 2011 16:50, amrit pal pathak
<amritpalpathak1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:>
>
> On Apr 25, 9:37 am, Tim Shaffer
<timshaf...-BUHhN+a2lJ4@public.gmane.org> wrote:
>> Actually it looks like you''re not defining it in the example
you provided.
>>
>> Your controller is defining a variable called @book, but your view is
trying
>> to reference a variable called @post. Do you have a PostsController?
>             Yes it was mistake,but now i changed @post to @book.Still
> same error exits
>  NoMethodError in Book#new
> Showing /home/amrit/boook/app/views/book/_form.html.erb where line #1
> raised:
> undefined method `model_name'' for NilClass:Class
In that case @book is probably nil.

Have a look at the Rails Guide on debugging and it will show you how
to use ruby-debug to break into your code and inspect data and follow
flow.  Then you can debug these issues for yourself.

Another useful technique is to open the rails console in your app by
rails console
then you can run code to see what happens.  For example you could
enter, in the console
Book.all
and it would show you the result of that.

Note though that if you are using
@book = Book.all
as in an earlier post, that should give you an array of books not a
single one, so formFor(@book) would not be valid.  I don''t think that
would not give the nil error you are seeing however.  You probably
want Book.first or a query to select a particular book.
That assumes you have a book in the database of course.  If you want
to create a new one then perhaps
@book = Book,new
is what you want.

Colin

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amrit pal pathak

2011-Apr-26 07:56 UTC

head link

Re: NoMethodError in Book

On Apr 25, 11:59 am, Colin Law
<clan...-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>
wrote:> On 25 April 2011 16:50, amrit pal pathak
<amritpalpath...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
>
>
> > On Apr 25, 9:37 am, Tim Shaffer
<timshaf...-BUHhN+a2lJ4@public.gmane.org> wrote:
> >> Actually it looks like you''re not defining it in the
example you provided.
>
> >> Your controller is defining a variable called @book, but your view
is trying
> >> to reference a variable called @post. Do you have a
PostsController?
> >             Yes it was mistake,but now i changed @post to @book.Still
> > same error exits
> >  NoMethodError in Book#new
> > Showing /home/amrit/boook/app/views/book/_form.html.erb where line #1
> > raised:
> > undefined method `model_name'' for NilClass:Class
>
> In that case @book is probably nil.
>
> Have a look at the Rails Guide on debugging and it will show you how
> to use ruby-debug to break into your code and inspect data and follow
> flow.  Then you can debug these issues for yourself.
>
> Another useful technique is to open the rails console in your app by
> rails console
> then you can run code to see what happens.  For example you could
> enter, in the console
> Book.all
> and it would show you the result of that.
>
> Note though that if you are using
> @book = Book.all
> as in an earlier post, that should give you an array of books not a
> single one, so formFor(@book) would not be valid.  I don''t think
that
> would not give the nil error you are seeing however.  You probably
> want Book.first or a query to select a particular book.
> That assumes you have a book in the database of course.  If you want
> to create a new one then perhaps
> @book = Book,new
> is what you want.                   Now i wont want arrary of books for display.I just
want to create a empty form for book so in controller i removed
"@book.Book.all" .Now controller only holds

class BookController < ApplicationController
  def index
 @book =Book.new
  end
  end


1)Index.html.erb:

<h1>Books are coming soon!</h1>
<h1>Listing Books</h1>
 <table>
  <tr>
    <th>Title</th>
    <th>Summary</th>
    <th></th>
    <th></th>
    <th></th>
  </tr>
 <% @book.each do |book| %>
  <tr>
    <td><%= book.title %></td>
    <td><%= book.content %></td>
    </tr>
<% end %>
</table>
 <br />
 <%= link_to ''New book'', new_book_path%>


2)new.html.erb:

<h1>New post</h1>
<%= render ''form'' %>



3)_form.html.erb

<%= form_for(@book) do |f| %>
  <% if @book.errors.any? %>
    <div id="error_explanation">
      <h2><%= pluralize(@book.errors.count, "error") %>
prohibited
this book from being saved:</h2>
      <ul>
      <% @book.errors.full_messages.each do |msg| %>
        <li><%= msg %></li>
      <% end %>
      </ul>
    </div>
  <% end %>
  <div class="field">
    <%= f.label :name %><br />
    <%= f.text_field :name %>
  </div>
  <div class="field">
    <%= f.label :title %><br />
    <%= f.text_field :title %>
  </div>
  <div class="field">
    <%= f.label :content %><br />
    <%= f.text_area :content %>
  </div>
  <div class="actions">
    <%= f.submit %>
  </div>
<% end %>



 
Still  Error says
NoMethodError in Book#index

Showing /home/amrit/boook/app/views/book/index.html.erb where line #14
raised:

undefined method `each'' for #<Book id: nil, created_at: nil,
updated_at: nil>

Thanks colin

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Colin Law

2011-Apr-26 08:15 UTC

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Re: Re: NoMethodError in Book

On 26 April 2011 08:56, amrit pal pathak
<amritpalpathak1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:> ...
> class BookController < ApplicationController
>  def index
>  @book =Book.new
Think about what this is doing.  What is @book?  It is a new Book
object, not surprisingly.
>  end
>  end
>
>
> 1)Index.html.erb:
>
> <h1>Books are coming soon!</h1>
> <h1>Listing Books</h1>
>  <table>
>  <tr>
>    <th>Title</th>
>    <th>Summary</th>
>    <th></th>
>    <th></th>
>    <th></th>
>  </tr>
>  <% @book.each do |book| %>
Above is the line the error is on, what is it supposed to be doing?
Please explain what you think it means.
>  ...
> NoMethodError in Book#index
>
> Showing /home/amrit/boook/app/views/book/index.html.erb where line #14
> raised:
>
> undefined method `each'' for #<Book id: nil, created_at: nil,
> updated_at: nil>
When you see an error it is not always easy for a beginner to work out
what it means.  Please try and work it out for yourself before asking
here.  What do you think it might mean?  Also as I asked above, what
do you think that line is supposed to do?

Colin

I just hope I am building up rewards for when it is time to meet my Maker.

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amrit pal pathak

2011-Apr-26 08:23 UTC

head link

Re: NoMethodError in Book

On Apr 26, 4:15 am, Colin Law
<clan...-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>
wrote:> On 26 April 2011 08:56, amrit pal pathak
<amritpalpath...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
> > ...
> > class BookController < ApplicationController
> >  def index
> >  @book =Book.new
>
> Think about what this is doing.  What is @book?  It is a new Book
> object, not surprisingly.
>
>
>
>
>
>
>
>
>
> >  end
> >  end
>
> > 1)Index.html.erb:
>
> > <h1>Books are coming soon!</h1>
> > <h1>Listing Books</h1>
> >  <table>
> >  <tr>
> >    <th>Title</th>
> >    <th>Summary</th>
> >    <th></th>
> >    <th></th>
> >    <th></th>
> >  </tr>
> >  <% @book.each do |book| %>
>
> Above is the line the error is on, what is it supposed to be doing?
> Please explain what you think it means.
              I think it retrieves the book details like title and
contents from database.But here it no use so am removing this block.
             <% @book.each do |book| %>
  <tr>
    <td><%= book.title %></td>
    <td><%= book.content %></td>

  </tr>
<% end %>
> > NoMethodError in Book#index
>
> > Showing /home/amrit/boook/app/views/book/index.html.erb where line #14
> > raised:
>
> > undefined method `each'' for #<Book id: nil, created_at:
nil,
> > updated_at: nil>
>
> When you see an error it is not always easy for a beginner to work out
> what it means.  Please try and work it out for yourself before asking
> here.  What do you think it might mean?  Also as I asked above, what
> do you think that line is supposed to do?

Amrit pal

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amrit pal pathak

2011-Apr-26 08:30 UTC

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Re: NoMethodError in Book

Afer removing that block(from index.html.erb) ,i can see localhost:
3000/book ,but when i click on "New book" link it gave follwoing error

NoMethodError in Book#new

Showing /home/amrit/boook/app/views/book/_form.html.erb where line #1
raised:

undefined method `model_name'' for NilClass:Class


Thanks

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Colin Law

2011-Apr-26 08:31 UTC

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Re: Re: NoMethodError in Book

On 26 April 2011 09:23, amrit pal pathak
<amritpalpathak1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:>
>
> On Apr 26, 4:15 am, Colin Law
<clan...-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org> wrote:
>> On 26 April 2011 08:56, amrit pal pathak
<amritpalpath...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>>
>> > ...
>> > class BookController < ApplicationController
>> >  def index
>> >  @book =Book.new
>>
>> Think about what this is doing.  What is @book?  It is a new Book
>> object, not surprisingly.
>>
>> >  <% @book.each do |book| %>
>>
>> Above is the line the error is on, what is it supposed to be doing?
>> Please explain what you think it means.
>
>              I think it retrieves the book details like title and
> contents from database.
How would @book.each retrieve contents from the db?  ''each'' is
a
method of Array (or other collection) that iterates the collection
passing each one to the block.  Since @book is not a collection but is
a single Book then each is not a valid method to call.
> But here it no use so am removing this block.
Very sensible, though why you are doing this in the index method I do
not know, it looks as if it would be more appropriate in the
''new''
method.  I presume you are just experimenting however, which is fine.

Colin

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amrit pal pathak

2011-Apr-26 08:41 UTC

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Re: NoMethodError in Book

On Apr 26, 4:30 am, amrit pal pathak
<amritpalpath...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:> Afer removing that block(from index.html.erb) ,i can see localhost:
> 3000/book ,but when i click on "New book" link it gave follwoing
error
>
> NoMethodError in Book#new
>
> Showing /home/amrit/boook/app/views/book/_form.html.erb where line #1
> raised:
>
> undefined method `model_name'' for NilClass:Class             Should creation of model by "rails generate model book"
will resolve this error??

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Colin Law

2011-Apr-26 08:44 UTC

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Re: Re: NoMethodError in Book

On 26 April 2011 09:41, amrit pal pathak
<amritpalpathak1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:>
>
> On Apr 26, 4:30 am, amrit pal pathak
<amritpalpath...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> wrote:
>> Afer removing that block(from index.html.erb) ,i can see localhost:
>> 3000/book ,but when i click on "New book" link it gave
follwoing error
>>
>> NoMethodError in Book#new
>>
>> Showing /home/amrit/boook/app/views/book/_form.html.erb where line #1
>> raised:
>>
>> undefined method `model_name'' for NilClass:Class
>             Should creation of model by "rails generate model
book"
> will resolve this error??
You already have a Book model so no point generating it again.

You have had this error before, please read the error carefully.  It
says that something is nil that should not be.
Earlier I suggested using ruby-debug to break into your code to see
what is going on.  What do you see if you break in at this point in
the code?

Colin

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Michael Pavling

2011-Apr-26 08:46 UTC

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Re: Re: NoMethodError in Book

On 26 April 2011 09:15, Colin Law
<clanlaw-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>
wrote:> I just hope I am building up rewards for when it is time to meet my Maker.
You have the patience of a saint....

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amrit pal pathak

2011-Apr-26 08:59 UTC

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Re: NoMethodError in Book

On Apr 26, 4:44 am, Colin Law
<clan...-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>
wrote:> On 26 April 2011 09:41, amrit pal pathak
<amritpalpath...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
>
>
> > On Apr 26, 4:30 am, amrit pal pathak
<amritpalpath...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> > wrote:
> >> Afer removing that block(from index.html.erb) ,i can see
localhost:
> >> 3000/book ,but when i click on "New book" link it gave
follwoing error
>
> >> NoMethodError in Book#new
>
> >> Showing /home/amrit/boook/app/views/book/_form.html.erb where line
#1
> >> raised:
>
> >> undefined method `model_name'' for NilClass:Class
> >             Should creation of model by "rails generate model
book"
> > will resolve this error??
>
> You already have a Book model so no point generating it again.
         Yes you are right>
> You have had this error before, please read the error carefully.  It
> says that something is nil that should not be.       Nil means it says db has nothing to show or
else??> Earlier I suggested using ruby-debug to break into your code to see
> what is going on.  What do you see if you break in at this point in
> the code?         I used the rails console it says

 amrit@ubuntu:~/boook$ rails console
Loading development environment (Rails 3.0.7)
irb(main):001:0> Book.all
=> []

                        Please let me clear,i am just
expermenting.Please Guides me to just generate a  empty form with two
fields (name and content)after click on "New Book " link in the
index.html.erb file(May be without  it is connected to db).

Thanks for continuos support.

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amrit pal pathak

2011-Apr-26 09:01 UTC

head link

Re: NoMethodError in Book

On Apr 26, 4:46 am, Michael Pavling
<pavl...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:> On 26 April 2011 09:15, Colin Law
<clan...-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org> wrote:
>
> > I just hope I am building up rewards for when it is time to meet my
Maker.
>
> You have the patience of a saint....
 Thanks sir

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Colin Law

2011-Apr-26 09:09 UTC

head link

Re: Re: NoMethodError in Book

On 26 April 2011 09:59, amrit pal pathak
<amritpalpathak1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:>
>
> On Apr 26, 4:44 am, Colin Law
<clan...-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org> wrote:
>> On 26 April 2011 09:41, amrit pal pathak
<amritpalpath...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>>
>>
>>
>> > On Apr 26, 4:30 am, amrit pal pathak
<amritpalpath...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
>> > wrote:
>> >> Afer removing that block(from index.html.erb) ,i can see
localhost:
>> >> 3000/book ,but when i click on "New book" link it
gave follwoing error
>>
>> >> NoMethodError in Book#new
>>
>> >> Showing /home/amrit/boook/app/views/book/_form.html.erb where
line #1
>> >> raised:
>>
>> >> undefined method `model_name'' for NilClass:Class
>> >             Should creation of model by "rails generate model
book"
>> > will resolve this error??
>>
>> You already have a Book model so no point generating it again.
>
>         Yes you are right
>>
>> You have had this error before, please read the error carefully.  It
>> says that something is nil that should not be.
>       Nil means it says db has nothing to show or else??
Nothing to do with the database directly, it is saying a variable that
you are using is nil.  Look at where you setup the variable that is
nil to find out why.
>> Earlier I suggested using ruby-debug to break into your code to see
>> what is going on.  What do you see if you break in at this point in
>> the code?
>         I used the rails console it says
>
>  amrit@ubuntu:~/boook$ rails console
> Loading development environment (Rails 3.0.7)
> irb(main):001:0> Book.all
> => []
That is saying that there are no books in the database, but that is
not necessarily anything to do with your problem.  As I said earlier
look at where you are setting up the variable that is nil.

Colin

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amrit pal pathak

2011-Apr-26 09:21 UTC

head link

Re: NoMethodError in Book

On Apr 26, 5:09 am, Colin Law
<clan...-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>
wrote:> On 26 April 2011 09:59, amrit pal pathak
<amritpalpath...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
>
>
>
>
>
>
>
>
>
>
> > On Apr 26, 4:44 am, Colin Law
<clan...-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org> wrote:
> >> On 26 April 2011 09:41, amrit pal pathak
<amritpalpath...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
> >> > On Apr 26, 4:30 am, amrit pal pathak
<amritpalpath...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> >> > wrote:
> >> >> Afer removing that block(from index.html.erb) ,i can see
localhost:
> >> >> 3000/book ,but when i click on "New book" link
it gave follwoing error
>
> >> >> NoMethodError in Book#new
>
> >> >> Showing /home/amrit/boook/app/views/book/_form.html.erb
where line #1
> >> >> raised:
>
> >> >> undefined method `model_name'' for NilClass:Class
> >> >             Should creation of model by "rails generate
model book"
> >> > will resolve this error??
>
> >> You already have a Book model so no point generating it again.
>
> >         Yes you are right
>
> >> You have had this error before, please read the error carefully.
 It
> >> says that something is nil that should not be.
> >       Nil means it says db has nothing to show or else??
>
> Nothing to do with the database directly, it is saying a variable that
> you are using is nil.  Look at where you setup the variable that is
> nil to find out why.
>
> >> Earlier I suggested using ruby-debug to break into your code to
see
> >> what is going on.  What do you see if you break in at this point
in
> >> the code?
> >         I used the rails console it says
>
> >  amrit@ubuntu:~/boook$ rails console
> > Loading development environment (Rails 3.0.7)
> > irb(main):001:0> Book.all
> > => []
>
> That is saying that there are no books in the database, but that is
> not necessarily anything to do with your problem.  As I said earlier
> look at where you are setting up the variable that is nil.                             is it saying @book variablei is nil?
   it is defined in controller as :

 class BookController < ApplicationController
  def index
  @book =Book.new
  end
  end
                                                One thing more,in
new.html.erb,i have written "render ''form'' ",but
there is no such file
(view).The file there is _form.html.erb.Is it correct?

Amrit pal

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Frederick Cheung

2011-Apr-26 09:55 UTC

head link

Re: NoMethodError in Book

On Apr 26, 10:21 am, amrit pal pathak
<amritpalpath...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
>
>                              is it saying @book variablei is nil?
>    it is defined in controller as :
>
>  class BookController < ApplicationController
>   def index
>   @book =Book.new
>   end
>   end
Your index action defines @book, but you''re testing the "new"
action.
>                                                 One thing more,in
> new.html.erb,i have written "render ''form''
",but there is no such file
> (view).The file there is _form.html.erb.Is it correct?
That''s ok - rails will work that bit out.

Fred>
> Amrit pal
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amrit pal pathak

2011-Apr-26 11:28 UTC

head link

Re: NoMethodError in Book

On Apr 26, 5:55 am, Frederick Cheung
<frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:> On Apr 26, 10:21 am, amrit pal pathak
<amritpalpath...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> wrote:
>
>
>
> >                              is it saying @book variablei is nil?
> >    it is defined in controller as :
>
> >  class BookController < ApplicationController
> >   def index
> >   @book =Book.new
> >   end
> >   end
>
> Your index action defines @book, but you''re testing the
"new" action.                Correspond to index action i have index file which
hold following code and i can access this file successfully but when i
click on "New book",it gives the error
<h1>Books are coming soon!</h1>

<h1>Listing Books</h1>

<table>
  <tr>
    <th>Title</th>
    <th>Summary</th>
    <th></th>
    <th></th>
    <th></th>
  </tr>
 </table>
 <br />
 <%= link_to ''New book'', new_book_path%>

> >                                                 One thing more,in
> > new.html.erb,i have written "render ''form''
",but there is no such file
> > (view).The file there is _form.html.erb.Is it correct?
>
> That''s ok - rails will work that bit out.
      Ok .but if i change the name from _form to form ,is will ok?

Thanks

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Ar Chron

2011-Apr-26 11:52 UTC

head link

Re: NoMethodError in Book

amritpal p. wrote in post #995086:> Stuff...
You seem to be lacking some fundamental "organizational" knowledge as
it
pertains to a Rails application.

What I found very instructive way back when was to scaffold a basic 
application and see what Rails created, and how it was organized.  Then 
I fiddled with that scaffolded application, one change at a time.

If you have an existing application, you can just add a scaffolded 
model, controller, and views via:

rails g scaffold person first_name:string last_name:string

(doesn''t have to be person, could be anything, just give it a model
name
and some attributes with types).

Then look at the controller, model, and views that are created.  Most 
enlightening.

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Frederick Cheung

2011-Apr-26 11:53 UTC

head link

Re: Re: NoMethodError in Book

On 26 Apr 2011, at 12:28, amrit pal pathak
<amritpalpathak1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> 
> 
> On Apr 26, 5:55 am, Frederick Cheung
<frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> wrote:
>> On Apr 26, 10:21 am, amrit pal pathak
<amritpalpath...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
>> wrote:
>> 
>> 
>> 
>>>                              is it saying @book variablei is nil?
>>>    it is defined in controller as :
>> 
>>>  class BookController < ApplicationController
>>>   def index
>>>   @book =Book.new
>>>   end
>>>   end
>> 
>> Your index action defines @book, but you''re testing the
"new" action.
>                Correspond to index action i have index file which
> hold following code and i can access this file successfully but when i
> click on "New book",it gives the error
Yes, we know that. What you don''t seem to grasp is that because the new
page is being displayed the index method isn''t called (the new method,
if it exists will be called) so @book isn''t set

Fred
> <h1>Books are coming soon!</h1>
> 
> <h1>Listing Books</h1>
> 
> <table>
>  <tr>
>    <th>Title</th>
>    <th>Summary</th>
>    <th></th>
>    <th></th>
>    <th></th>
>  </tr>
> </table>
> <br />
> <%= link_to ''New book'', new_book_path%>
> 
> 
>>>                                                 One thing more,in
>>> new.html.erb,i have written "render ''form''
",but there is no such file
>>> (view).The file there is _form.html.erb.Is it correct?
>> 
>> That''s ok - rails will work that bit out.
> 
>      Ok .but if i change the name from _form to form ,is will ok?
> 
> Thanks
> 
> -- 
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amrit pal pathak

2011-Apr-26 12:26 UTC

head link

Re: NoMethodError in Book

On Apr 26, 7:52 am, Ar Chron
<li...-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org>
wrote:> amritpal p. wrote in post #995086:
>
> > Stuff...
>
> You seem to be lacking some fundamental "organizational"
knowledge as it
> pertains to a Rails application.
>
> What I found very instructive way back when was to scaffold a basic
> application and see what Rails created, and how it was organized.  Then
> I fiddled with that scaffolded application, one change at a time.
>
> If you have an existing application, you can just add a scaffolded
> model, controller, and views via:
>
> rails g scaffold person first_name:string last_name:string
>
> (doesn''t have to be person, could be anything, just give it a
model name
> and some attributes with types).
>
> Then look at the controller, model, and views that are created.  Most
> enlightening.          Yes i have tried scafffolding.But i want to generate a form
without scaffold.i want to manualy create a controller,view and model
for it.please help to do it.

Thanks

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amrit pal pathak

2011-Apr-26 12:35 UTC

head link

Re: NoMethodError in Book

On Apr 26, 7:53 am, Frederick Cheung
<frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:> On 26 Apr 2011, at 12:28, amrit pal pathak
<amritpalpath...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
>
>
>
>
>
>
>
>
>
>
> > On Apr 26, 5:55 am, Frederick Cheung
<frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> > wrote:
> >> On Apr 26, 10:21 am, amrit pal pathak
<amritpalpath...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> >> wrote:
>
> >>>                              is it saying @book variablei is
nil?
> >>>    it is defined in controller as :
>
> >>>  class BookController < ApplicationController
> >>>   def index
> >>>   @book =Book.new
> >>>   end
> >>>   end
>
> >> Your index action defines @book, but you''re testing the
"new" action.
> >                Correspond to index action i have index file which
> > hold following code and i can access this file successfully but when i
> > click on "New book",it gives the error
>
> Yes, we know that. What you don''t seem to grasp is that because
the new page is being displayed the index method isn''t called (the new
method, if it exists will be called) so @book isn''t set
         you mean i should make a  another method "new" inside
controller and "@book =Book.new" should be written there?

Amrit pal

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Frederick Cheung

2011-Apr-26 13:17 UTC

head link

Re: NoMethodError in Book

On Apr 26, 1:35 pm, amrit pal pathak
<amritpalpath...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:>
>          you mean i should make a  another method "new" inside
> controller and "@book =Book.new" should be written there?
>
Yes. Seriously, give the scaffolds a go, even if you don''t want to use
them for your finished product (which is fair enough), you''d at least
get a vague idea of what goes where and what things need to be done.

Fred

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Ar Chron

2011-Apr-26 14:10 UTC

head link

Re: NoMethodError in Book

amritpal p. wrote in post #995096:> Yes i have tried scafffolding.But i want to generate a form
> without scaffold.i want to manualy create a controller,view and model
> for it.please help to do it.
>
> Thanks
Yes, fair enough. But use the scaffolded elements as the prototype for
your manual creations... If you have scaffolded something, then the
"right way" (or at least the way that follows the Rails conventions
most
cleanly) is there in front of you.

Suppose you want a book model.
1. You''ll need a books_controller. By conventions:
- the index method in the controller retrieves all the books into a
variable named @books.
- the show method retrieves a single existing book stored into a
variable named @book according to an id received in the params
- the new method created a new book, named @book via a simple @book =
Book.new
- the edit method also retrieves a single existing book stored into a
variable named @book according to an id received in the params
- the create method receives a book definition via params and creates a
new @book instance from the values contained in the params, then
attempts to persist that object in the DB.
- the update method retrieves an existing book via a find using the id
received in the params, then updates that books attributes with those
also received in the params.
- destroy finds a book according to the id received in the params, and,
well, deletes it.

Each of these controller methods, be default, will have its results
rendered in a view named according to the method that the view supports.
- index method renders its output via the index.html.erb
- new and edit render via new.html.erb and edit.html.erb, each of which
uses a partial named _form.html.erb (and yes, that underscore at the
beginning of the filename is important).

If you are creating your own, then don''t forget to update the routes.rb
when you add a new model and controller, or action to an existing
model/controller.

All of this is readily apparent from a study of a scaffolded solution,
and a little reading.

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amrit pal pathak

2011-Apr-27 14:05 UTC

head link

Re: NoMethodError in Book

On Apr 26, 8:35 am, amrit pal pathak
<amritpalpath...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:> On Apr 26, 7:53 am, Frederick Cheung
<frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> wrote:
>
>
>
>
>
>
>
>
>
> > On 26 Apr 2011, at 12:28, amrit pal pathak
<amritpalpath...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
> > > On Apr 26, 5:55 am, Frederick Cheung
<frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> > > wrote:
> > >> On Apr 26, 10:21 am, amrit pal pathak
<amritpalpath...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> > >> wrote:
>
> > >>>                              is it saying @book variablei
is nil?
> > >>>    it is defined in controller as :
>
> > >>>  class BookController < ApplicationController
> > >>>   def index
> > >>>   @book =Book.new
> > >>>   end
> > >>>   end
>
> > >> Your index action defines @book, but you''re testing
the "new" action.
> > >                Correspond to index action i have index file which
> > > hold following code and i can access this file successfully but
when i
> > > click on "New book",it gives the error
>
> > Yes, we know that. What you don''t seem to grasp is that
because the new page is being displayed the index method isn''t called
(the new method, if it exists will be called) so @book isn''t set
>
>          you mean i should make a  another method "new" inside
> controller and "@book =Book.new" should be written there?
>Awaiting your helpful reply!!

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amrit pal pathak

2011-Apr-27 15:10 UTC

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Re: NoMethodError in Book

Awaiting your helpful reply!!

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Pale Horse

2011-Apr-27 16:05 UTC

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Re: NoMethodError in Book

> amritpal p. wrote in post #995333:
>
> Awaiting your helpful reply!!
You''ve already got an answer - your ''@book'' method is
undefined in the
''new'' action of your controller. You need to define
''@book'' in ''new''
before you can access it.

When an object such as a variable is undefined, it will return nil which 
is what you''re seeing.

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amrit pal pathak

2011-Apr-28 03:03 UTC

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Re: NoMethodError in Book

On Apr 26, 8:35 am, amrit pal pathak
<amritpalpath...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:> On Apr 26, 7:53 am, Frederick Cheung
<frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> wrote:
>
>
>
>
>
>
>
>
>
> > On 26 Apr 2011, at 12:28, amrit pal pathak
<amritpalpath...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
> > > On Apr 26, 5:55 am, Frederick Cheung
<frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> > > wrote:
> > >> On Apr 26, 10:21 am, amrit pal pathak
<amritpalpath...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> > >> wrote:
>
> > >>>                              is it saying @book variablei
is nil?
> > >>>    it is defined in controller as :
>
> > >>>  class BookController < ApplicationController
> > >>>   def index
> > >>>   @book =Book.new
> > >>>   end
> > >>>   end
>
> > >> Your index action defines @book, but you''re testing
the "new" action.
> > >                Correspond to index action i have index file which
> > > hold following code and i can access this file successfully but
when i
> > > click on "New book",it gives the error
>
> > Yes, we know that. What you don''t seem to grasp is that
because the new page is being displayed the index method isn''t called
(the new method, if it exists will be called) so @book isn''t set
>
>          you mean i should make a  another method "new" inside
> controller and "@book =Book.new" should be written there?             Awaiting your helpful reply!!

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