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Steve Knit

2012-May-29 11:56 UTC

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.

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Jeremy Walker

2012-May-29 12:03 UTC

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Re: Relationship issue with activerecord rails

On 29 May 2012 12:56, Steve Knit
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote:
> 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" ?


>
>        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.
>
> --
> Posted via http://www.ruby-forum.com/.
>
> --
> You received this message because you are subscribed to the Google Groups
> "Ruby on Rails: Talk" group.
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>
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>
>
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Steve Knit

2012-May-29 12:14 UTC

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Re: Relationship issue with activerecord rails

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

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Jeremy Walker

2012-May-29 12:18 UTC

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Re: Re: Relationship issue with activerecord rails

On 29 May 2012 13:14, Steve Knit
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote:
> 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?

>
>
> 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
>
> --
> Posted via http://www.ruby-forum.com/.
>
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>
>
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Steve Knit

2012-May-29 12:26 UTC

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Re: Relationship issue with activerecord rails

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

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Jeremy Walker

2012-May-29 13:00 UTC

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Re: Re: Relationship issue with activerecord rails

On 29 May 2012 13:26, Steve Knit
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote:
> 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.


>
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Pringles Original

2012-May-29 13:55 UTC

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Re: Re: Relationship issue with activerecord rails

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

On Tue, May 29, 2012 at 9:00 AM, Jeremy Walker
<jez.walker-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
>
> On 29 May 2012 13:26, Steve Knit
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote:
>
>> 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.
>
>
>
>>
>> --
>> Posted via http://www.ruby-forum.com/.
>>
>> --
>> You received this message because you are subscribed to the Google
Groups
>> "Ruby on Rails: Talk" group.
>> To post to this group, send email to
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>> To unsubscribe from this group, send email to
>>
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>> For more options, visit this group at
>> http://groups.google.com/group/rubyonrails-talk?hl=en.
>>
>>
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Rails - May 2012 - Relationship issue with activerecord rails

Relationship issue with activerecord rails

Re: Relationship issue with activerecord rails

Re: Relationship issue with activerecord rails

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Re: Relationship issue with activerecord rails

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