Partials issue

Rails
1

I’m following an example in the “Head First Rails” book regarding
partials.

The book seems to be using a version prior Rails 3.0.0, which I’m using.

I’m having a small issue here.

There is a “new.html.erb” for “Seats” which will be created as a partial
to be included in the “show.html.erb” page of “flights”.

So, the book mentions to copy: app/views/seats/new.html.erb and paste it
to app/views/flights/_new_seat.html.erb

But, I’m using Rails 3.0.0, and you know that “new.html.erb” for “Seats”
looks something like this:

New seat

<%= render ‘form’ %>

<%= link_to ‘Back’, seats_path %>

So, there is a _form.html.erb created automatically.

What did I do?

I copied the code above and inserted it as required in
app/views/flights/_new_seat.html.erb and removing the last line.

Now came the problem when the book mentions that we make @seat in
app/views/flights/_new_seat.html.erb a LOCAL variable, as follows:

<% form_for(seat) do | f| % >

But, where is: <% form_for(@seat) do | f| % > in my case?

It is in _form.html.erb

And, here is a part of _form.html.erb (Notice @seat)

<%= form_for(@seat) do |f| %>
<% if @seat.errors.any? %>


<%= pluralize(@seat.errors.count, “error”) %> prohibited this
seat from being saved:

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

<% end %>

If I change @seat here to “seat”, this I think will affect
“new.html.erb” and “edit.html.erb” of “seats”.

So, I copied the file to app/views/flights/_form_seat.html.erb and
changed ALL @seat to “seat”.

After running the application I get the following:

undefined local variable or method `seat’ for
#<#Class:0x4de6b78:0x4e5b9b0>

Extracted source (around line #1):

1: <%= form_for(seat) do |f| %>
2: <% if seat.errors.any? %>
3:


4:

<%= pluralize(seat.errors.count, “error”) %> prohibited
this seat from being saved:

How can I solve this issue?

Sorry for my long question, but had to clarify the point.

Thanks a lot.

2

I forgot to mention:

This is how I made the render in app/views/flights/_new_seat.html.erb

<%= render ‘form_seat’, :locals => {:seat => Seat.new} %>

Provided again, I’m using Rails 3.0.0

Thanks.

3

pass the seat variable with your render call something like this,

<%= render ‘form’, :locals => { :seat => @seat } %>

–
Regards,

T.Veerasundaravel.
http://tinyurl.com/25vma7h
@veerasundaravel

4

Veera S. wrote:

pass the seat variable with your render call something like this,

<%= render ‘form’, :locals => { :seat => @seat } %>

–
Regards,

T.Veerasundaravel.
http://tinyurl.com/25vma7h
@veerasundaravel

Thanks @Veera.

It actually worked when I inserted :partial => explicitly like this:

<%= render :partial => ‘form_seat’, :locals => {:seat => Seat.new } %>

When I tried your solution:

<%= render ‘form_seat’, :locals => {:seat => @seat } %>

I got the following:

undefined local variable or method `seat’ for
#<#Class:0x515bb78:0x515aa50>

Extracted source (around line #1):

1: <%= form_for(seat) do |f| %>
2: <% if seat.errors.any? %>
3:


4:

<%= pluralize(seat.errors.count, “error”) %> prohibited
this seat from being saved:

Thanks.

5

tundrax wrote:

Try using <%= render ‘form’, :seat => @seat %> without locals.

Thanks @tundrax. I’ll try that soon.

6

Try using <%= render ‘form’, :seat => @seat %> without locals.

7

@Marnen. The issue was solved.

Thanks.

8

Abder-Rahman A. wrote:

I’m following an example in the “Head First Rails” book regarding
partials.

The book seems to be using a version prior Rails 3.0.0, which I’m using.

[…]

Then you’re setting yourself up for trouble. If you’re learning Rails
3, find a Rails 3 book.

Best,
–Â
Marnen Laibow-Koser
http://www.marnen.org
[email protected]