error on trying initial project

I'm trying out RoR for the first time. I've setup a application called wedding and in it I have created a model and controller for attendee. I have a db table attendees that has things like name, address, and phone which are all just varchar fields for now.

I figure it's a simple little project.

I can go to localhost:3000/attendee and I get the link for New Attendee. Ok, now when I click that link I get an error:

Quote:

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You have a nil object when you didn't expect it!
The error occured while evaluating nil.type_cast_code

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This is the code shown:

Code:

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Extracted source (around line #4):

1: <h1>New <%= @scaffold_singular_name %></h1>
2:
3: <%= error_messages_for(@scaffold_singular_name) %>
4: <%= form(@scaffold_singular_name, :action => "create#{@scaffold_suffix}") %>
5:
6: <%= link_to "Back", :action => "list#{@scaffold_suffix}" %>

---

Ok, so I tried to put in a record in the db and go back to the listing page. I get the same error with different code.

Code:

---

Extracted source (around line #15):

12:  <% for column in @scaffold_class.content_columns %>
13:    <td><%= entry.send(column.name) %></td>
14:  <% end %>
15:    <td><%= link_to "Show", :action => "show#{@scaffold_suffix}", :id => entry %></td>
16:    <td><%= link_to "Edit", :action => "edit#{@scaffold_suffix}", :id => entry %></td>
17:    <td><%= link_to "Destroy", {:action => "destroy#{@scaffold_suffix}", :id => entry}, {:confirm => "Are you sure?"} %></td>
18:  </tr>

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Ok, so can anyone explain what's up with this? The code for the controller is just:

Code:

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class AttendeeController < ApplicationController
        model :attendee
        scaffold :attendee
end

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This is just like every demo I can find out there.

I appreciate any help I can get.

I don't really use scaffolrd but try:

scaffold: attendees

I found out the problem was I didn't have an ID field in the db and I used a capital letter for the names of the fields. Once I fixed this it started to work.

Of course after that I tried to run ruby scipt/generate scaffold attendee and I get an error:
error Before updating scaffolding from new DB schema, try creating a table for your model (Attendee)

Oh well, next hurdle.

Quote:

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Originally Posted by deuce868

I found out the problem was I didn't have an ID field in the db and I used a capital letter for the names of the fields. Once I fixed this it started to work.

Of course after that I tried to run ruby scipt/generate scaffold attendee and I get an error:
error Before updating scaffolding from new DB schema, try creating a table for your model (Attendee)

Oh well, next hurdle.

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Just for a future note, if you wished, for example the "name" to be the primary key, you must do something like this:

Code:

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class Person < ActiveRecord::Base
        self.primary_key = 'name'
 end

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I recently had a plethora of problems because I meant for my primary key to be 'name' but I assumed rails would know that it was the primary key.

In the current gem version of rails when you run:

ruby scipt/generate scaffold attendee

It will fail. There is a bug that is fixed in the edge rails and will be there in a gem release soon. The workaround for now is to specify the model and the controiller to the scaffold command. Like so:

ruby scipt/generate scaffold Attendee Attendee

That will work for you for now.

Cheers

-Ezra