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Nate

2007-Jan-27 02:10 UTC

undefined method `target'' in Rails associations (1.2)

I''m having trouble with one of my Rails model associations. They seem
simple enough, I have 99% of them working. But in one of them, when I
try to access a foreign key record, I get:

   undefined method `target'' for #<Environment:0xb766c70c>

   vendor/rails/activerecord/lib/active_record/base.rb:1848:in
`method_missing''
   vendor/rails/activerecord/lib/active_record/associations.rb:891:in
`environment''
   app/models/revision.rb:154:in `start''
   app/controllers/revisions_controller.rb:9:in `start''

Has anyone seen this? My associations are:

   class Revision < ActiveRecord::Base
        belongs_to :environment
        belongs_to :source_revision,
             :class_name => ''Revision'',
             :foreign_key => ''source_revision_id''
   end

   class Environment < ActiveRecord::Base
       belongs_to :layout
       belongs_to :life_cycle
       has_many :revisions
       has_many :titles, :through => :environment_titles
   end

I''ve tried many different variations, singular/plural, etc. BTW, the
''source_revision'' one works fine (I tried specifying
everything to the
environment belongs_to but it didn''t matter)

Here''s my tables, any clues? I''m REALLY stuck...


SQL> desc revisions;
 Name                                      Null?    Type
 ----------------------------------------- --------
----------------------------
 ID                                        NOT NULL NUMBER(38)
 REVISION                                  NOT NULL NUMBER(38)
 ENVIRONMENT_ID                            NOT NULL NUMBER(38)
 REVISION_TYPE_ID                                   NUMBER(38)
 EVENT_ID                                           NUMBER(38)
 IS_DEPLOYABLE                             NOT NULL NUMBER(38)
 IS_PROMOTABLE                             NOT NULL NUMBER(38)
 SOURCE_REVISION_ID                                 NUMBER(38)
 UPDATED_BY                                         VARCHAR2(64)
 UPDATED_AT                                         DATE
 CREATED_BY                                         VARCHAR2(64)
 CREATED_AT                                         DATE

SQL> desc environments;
 Name                                      Null?    Type
 ----------------------------------------- --------
----------------------------
 ID                                        NOT NULL NUMBER(38)
 ENVIRONMENT                               NOT NULL VARCHAR2(64)
 ENVIRONMENT_DESC                                   VARCHAR2(256)
 LAYOUT_ID                                 NOT NULL NUMBER(38)
 LIFE_CYCLE_ID                             NOT NULL NUMBER(38)
 UNIX_GID                                           NUMBER(38)
 UNIX_UID                                           NUMBER(38)
 DEFAULT_DB_SERVER_ID                               NUMBER(38)
 AUTH_OBJECT_ID                            NOT NULL NUMBER(38)
 UPDATED_BY                                         VARCHAR2(64)
 UPDATED_AT                                         DATE
 CREATED_BY                                         VARCHAR2(64)
 CREATED_AT                                         DATE


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Mark Reginald James

2007-Jan-27 11:59 UTC

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Re: undefined method `target'' in Rails associations (1.2)

Nate wrote:
>    undefined method `target'' for #<Environment:0xb766c70c>
> 
>    vendor/rails/activerecord/lib/active_record/base.rb:1848:in
> `method_missing''
>    vendor/rails/activerecord/lib/active_record/associations.rb:891:in
> `environment''
>    app/models/revision.rb:154:in `start''
>    app/controllers/revisions_controller.rb:9:in `start''
> 
> Has anyone seen this? My associations are:
> 
>    class Revision < ActiveRecord::Base
>         belongs_to :environment
>         belongs_to :source_revision,
>              :class_name => ''Revision'',
>              :foreign_key => ''source_revision_id''
>    end
In your Revision model are you making any assignments to an @environment
instance variable, or have you defined an "environment" attr_accessor?
If so, rename to avoid conflict with the belongs_to.

-- 
We develop, watch us RoR, in numbers too big to ignore.


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Nate

2007-Jan-27 13:33 UTC

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Re: undefined method `target'' in Rails associations (1.2)

Thanks - that''s exactly what it was. Deeply nested private method 
(written by somebody else :-).

Cheers,
Nate


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Chris Bloom

2008-Oct-21 22:44 UTC

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Re: undefined method `target'' in Rails associations (1.2)

Mark Reginald James wrote:> Nate wrote:
> 
>> 
>>    class Revision < ActiveRecord::Base
>>         belongs_to :environment
>>         belongs_to :source_revision,
>>              :class_name => ''Revision'',
>>              :foreign_key => ''source_revision_id''
>>    end
> 
> In your Revision model are you making any assignments to an @environment
> instance variable, or have you defined an "environment"
attr_accessor?
> If so, rename to avoid conflict with the belongs_to.
> 
> --
> We develop, watch us RoR, in numbers too big to ignore.
Is there a way to do this and have it use the association? I need to 
override the assoc= method of a model to make sure the assignment 
matches some predefined criteria. However, if I try to assign via 
@assoc= I get the error message about an undefined target, and if I use 
self.assoc= I wind up in an endless recursion until a stack overflow 
occurs.

class Project < ActiveRecord::Base
  belongs_to :status, :class_name => "ProjectStatus",
    :foreign_key => ''status_code''

  # Updates the current project''s status unless the current
  # status is greater than the new status. Status'' are compared
  # using ProjectStatus::compare_status method The
  # new_project_status argument should be a ProjectStatus record
  # (i.e. ProjectStatus::SOME_STATUS)
  def status= (new_project_status, override = false)
    puts "Current status = #{@status}" #Debugging
    if override or @status < new_project_status
      puts "New status = #{new_project_status}" #Debugging
      @status = new_project_status
    else
      puts "No change in status" #Debugging
    end
  end
end

class ProjectStatus < ActiveRecord::Base
  has_many :project, :foreign_key => "status_code"

  def > (status); compare_status(status, ">"); end
  def >= (status); compare_status(status, ">="); end
  def < (status); compare_status(status, "<"); end
  def <= (status); compare_status(status, "<="); end

  def self.find_by_code (code)
    ProjectStatus.find(:first, :conditions => [''code = ?'',
code])
  end

  def to_s; self.status; end
  def to_i; self.id; end

  # Setup some shortcuts i.e. ProjectStatus::SOME_STATUS
  # will return the status record for that code
  def self.const_missing(sym)
    if s = ProjectStatus.find_by_code(sym.to_s)
      s
    else
      super
    end
  end

private

  def compare_status (status, op)
    eval self.order.to_s + op + status.order.to_s
  end
end
-- 
Posted via http://www.ruby-forum.com/.

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Frederick Cheung

2008-Oct-22 05:42 UTC

head link

Re: undefined method `target'' in Rails associations (1.2)

On 21 Oct 2008, at 18:44, Chris Bloom wrote:
>
> Mark Reginald James wrote:
>> Nate wrote:
>>
>>>
>>>   class Revision < ActiveRecord::Base
>>>        belongs_to :environment
>>>        belongs_to :source_revision,
>>>             :class_name => ''Revision'',
>>>             :foreign_key =>
''source_revision_id''
>>>   end
>>
>> In your Revision model are you making any assignments to an  
>> @environment
>> instance variable, or have you defined an "environment"  
>> attr_accessor?
>> If so, rename to avoid conflict with the belongs_to.
>>
>> --
>> We develop, watch us RoR, in numbers too big to ignore.
>
> Is there a way to do this and have it use the association? I need to
> override the assoc= method of a model to make sure the assignment
> matches some predefined criteria. However, if I try to assign via
> @assoc= I get the error message about an undefined target, and if I  
> use
> self.assoc= I wind up in an endless recursion until a stack overflow
> occurs.
>
> class Project < ActiveRecord::Base
>  belongs_to :status, :class_name => "ProjectStatus",
>    :foreign_key => ''status_code''
>
>  # Updates the current project''s status unless the current
>  # status is greater than the new status. Status'' are compared
>  # using ProjectStatus::compare_status method The
>  # new_project_status argument should be a ProjectStatus record
>  # (i.e. ProjectStatus::SOME_STATUS)
>  def status= (new_project_status, override = false)
>    puts "Current status = #{@status}" #Debugging
>    if override or @status < new_project_status
>      puts "New status = #{new_project_status}" #Debugging
>      @status = new_project_status
>    else
>      puts "No change in status" #Debugging
>    end
>  end
> end
@status needs to be an association proxy, not the raw ProjectStatus  
object. easiest way out is problably to alias_method the old status=  
method so that you can call it easily from  your status= method.

Fred>
>
> class ProjectStatus < ActiveRecord::Base
>  has_many :project, :foreign_key => "status_code"
>
>  def > (status); compare_status(status, ">"); end
>  def >= (status); compare_status(status, ">="); end
>  def < (status); compare_status(status, "<"); end
>  def <= (status); compare_status(status, "<="); end
>
>  def self.find_by_code (code)
>    ProjectStatus.find(:first, :conditions => [''code =
?'', code])
>  end
>
>  def to_s; self.status; end
>  def to_i; self.id; end
>
>  # Setup some shortcuts i.e. ProjectStatus::SOME_STATUS
>  # will return the status record for that code
>  def self.const_missing(sym)
>    if s = ProjectStatus.find_by_code(sym.to_s)
>      s
>    else
>      super
>    end
>  end
>
> private
>
>  def compare_status (status, op)
>    eval self.order.to_s + op + status.order.to_s
>  end
> end
> -- 
> Posted via http://www.ruby-forum.com/.
>
> >

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Chris Bloom

2008-Oct-22 05:58 UTC

head link

Re: undefined method `target'' in Rails associations (1.2)

Frederick Cheung wrote:> 
> @status needs to be an association proxy, not the raw ProjectStatus
> object. easiest way out is problably to alias_method the old status>
method so that you can call it easily from  your status= method.
> 
> Fred
Doesn''t alias_method and alias_method_chain only work from within a 
module? This is in an ActiveRecord class.
-- 
Posted via http://www.ruby-forum.com/.

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Frederick Cheung

2008-Oct-22 11:32 UTC

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Re: undefined method `target'' in Rails associations (1.2)

On Oct 22, 1:58 am, Chris Bloom
<rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:> Frederick Cheung wrote:
>
> > @status needs to be an association proxy, not the raw ProjectStatus
> > object. easiest way out is problably to alias_method the old
status> > method so that you can call it easily from  your status= method.
>
> > Fred
>
> Doesn''t alias_method and alias_method_chain only work from within
a
> module? This is in an ActiveRecord class.
Classes are modules (in that Class is a subclass of Module) and there
is nothing special about ActiveRecord classes in that respect.

Fred> --
> Posted viahttp://www.ruby-forum.com/.--~--~---------~--~----~------------~-------~--~----~
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Chris Bloom

2008-Oct-22 15:28 UTC

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Re: undefined method `target'' in Rails associations (1.2)

Frederick Cheung wrote:> Classes are modules (in that Class is a subclass of Module) and there
> is nothing special about ActiveRecord classes in that respect.
> 
> Fred
Oh, OK. I swear I had trouble using alias_method in a class once, but 
I''ll give it another go.

Thanks!
-- 
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Rails - Jan 2007 - undefined method `target' in Rails associations (1.2)

undefined method `target'' in Rails associations (1.2)

Re: undefined method `target'' in Rails associations (1.2)

Re: undefined method `target'' in Rails associations (1.2)

Re: undefined method `target'' in Rails associations (1.2)

Re: undefined method `target'' in Rails associations (1.2)

Re: undefined method `target'' in Rails associations (1.2)

Re: undefined method `target'' in Rails associations (1.2)

Re: undefined method `target'' in Rails associations (1.2)