Relationship issue with activerecord rails

I am still learning Rails, I've read some books and did some hands on at
codeschool.com and now I'm trying to write my first simple app from
scratch.

I'm using devise for authentication, but since i still kinda suck at
rails, I haven't gotten email confirmation working so currently, for
testing purposes only Admin users can take actions.

Here are my models:

    [loluser@fedora models]$ ls
    admin.rb pet.rb user.rb
    [loluser@fedora models]$ cat admin.rb
    class Admin < ActiveRecord::Base
      has_many :pets
      devise :database_authenticatable, :registerable, :timeoutable,
:validatable,
             :timeout_in => 20.minutes
    end
    [loluser@fedora models]$ cat pet.rb
    class pet < ActiveRecord::Base
      belongs_to :admin
    end
[loluser@fedora models]$

In my controller, I want to display Admin[1]'s pets in the index so i
have this code:

      class petsController < ApplicationController
      before_filter :authenticate_admin!
      # GET /pets
      # GET /pets.xml
      def index
      admin=Admin.find(1)
        @pets = pet.admin.all

        respond_to do |format|
          format.html # index.html.erb
          format.xml { render :xml => @pets }
        end
      end

However, I am getting this error:

    NoMethodError in petsController#index

    undefined method `admin' for #<Class:0x7f2daa7b0258>

    Rails.root: /home/loluser/dev/app2/devise_example
    Application Trace | Framework Trace | Full Trace

    app/controllers/pets_controller.rb:7:in `index'

Help will be appreciated and please let me know if I need to clarify
something.

Thanks in advance.

I am still learning Rails, I’ve read some books and did some hands on at

codeschool.com and now I’m trying to write my first simple app from

scratch.

I’m using devise for authentication, but since i still kinda suck at

rails, I haven’t gotten email confirmation working so currently, for

testing purposes only Admin users can take actions.

Here are my models:

[loluser@fedora models]$ ls

admin.rb  pet.rb  user.rb

[loluser@fedora models]$ cat admin.rb

class Admin < ActiveRecord::Base

  has_many  :pets

  devise :database_authenticatable, :registerable, :timeoutable,

:validatable,

         :timeout_in => 20.minutes

end

[loluser@fedora models]$ cat pet.rb

class pet < ActiveRecord::Base

  belongs_to :admin

end

[loluser@fedora models]$

In my controller, I want to display Admin[1]'s pets in the index so i

have this code:

  class petsController < ApplicationController

  before_filter :authenticate_admin!

  # GET /pets

  # GET /pets.xml

  def index

  admin=Admin.find(1)

    @pets = pet.admin.all

I’m guessing your pet object doesn’t have an admin method?

Should “pet.admin.all” maybe be “admin.pets” ?

Thanks for pointing me to @pets = admin.pets.all but now I'm getting the
error

    ActiveRecord::StatementInvalid in PetsController#index

    SQLite3::SQLException: no such column: pets.admin_id: SELECT
"pets".* FROM "pets" WHERE ("pets".admin_id = 1)

    Rails.root: /home/heptagone/dev/app2/devise_example
    Application Trace | Framework Trace | Full Trace

    app/controllers/pets_controller.rb:7:in `index'

I have already done the command "bundle exec rake:db migrate" so I'd
thing that admin_id would already part of pets as you can see my models
in my original post

Thanks for pointing me to @pets = admin.pets.all but now I’m getting the

error

ActiveRecord::StatementInvalid in PetsController#index



SQLite3::SQLException: no such column: pets.admin_id: SELECT

“pets”.* FROM “pets” WHERE (“pets”.admin_id = 1)

Rails.root: /home/heptagone/dev/app2/devise_example

Application Trace | Framework Trace | Full Trace

app/controllers/pets_controller.rb:7:in `index'

The error message says that the pets table does not have a column “admin_id”. Have you checked to see whether your pets table has a column called admin_id? What does your migration for the pets table look like?

Hello Jeremy, thanks for providing me your experience and quick
response!

Here is my migration, sorry for being such a newb....

[loluser@fedora migrate]$ cat 20120527225053_create_pets.rb
class CreatePets < ActiveRecord::Migration
  belongs_to :admin
  def self.up
    create_table :pets do |t|
      t.string :location
      t.string :public_key

      t.timestamps
    end
  end

  def self.down
    drop_table :pets
  end
end

Hello Jeremy, thanks for providing me your experience and quick

response!

You’re welcome! So you know, it’s customary to post your responses in the relevant place of a thread, rather than top-posting. It makes the conversation easier to follow.

Here is my migration, sorry for being such a newb…

[loluser@fedora migrate]$ cat 20120527225053_create_pets.rb

class CreatePets < ActiveRecord::Migration

belongs_to :admin

def self.up

create_table :pets do |t|

  t.string :location

  t.string :public_key



  t.timestamps

end

end

def self.down

drop_table :pets

end

end

You have the “belongs_to :admin” method in the wrong place. I’m interested that this even runs!

Your create_table block should look like this:

create_table :pets do |t|
t.belongs_to :admin
t.string :location
t.string :public_key

 t.timestamps

end

In this context, the belongs_to is part of the database creation schema and so must be placed within the create_table call.

Try changing that and then redoing the migration (rake db:migrate:redo) and see whether that fixes things.

Thanks Jeremy, your code got me rolling. I will be doing more reading http://guides.rubyonrails.org/association_basics.html