Rails - Apr 2008 - undefined method `goals_against' for #<YAML::Object:0x5584864>

Hi all,

I have a serialized object (of class Goals) in my statistics table. I
store it in the value row of statitics
When I do:
goals = Statistic.find(1).value.goals_against I get
undefined method `goals_against'' for #<YAML::Object:0x5584864>
(goals_against is a member of Goals)

Someone knows why this happens?

Thanks
Stijn
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Would you share your model definitions and the code that you use to
create/save the statistic and goals instances?

Craig

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Thanks for the reply,
Please find the models, database and class definition below.

I try to get the goals object like this
@statistics = @event.statistics.find(:all, :include
=> :statistic_definition)
goals_a =  @statistics.first.value.goals_against
=> undefined method `goals_against'' for
#<YAML::Object:0x579cbec>

The YAMLvalue in the database is:
--- !ruby/object:Goals
goals:
 1: 2
goals_against: 2
goals_for: 2
version: 1

The model:
class Statistic < ActiveRecord::Base
  belongs_to :event
  belongs_to :statistic_definition
  serialize :value
end

statitics table
id  	int(11)
value 	text
event_id 	int(11)
statistic_definition_id 	int(11)

The object I serialize
class Goals
  attr_accessor :goals
  attr_accessor :goals_for
  attr_accessor :goals_against
  attr_accessor :penalty_for
  attr_accessor :penalty_against

  def initialize(goals, goals_against, penalty_for = nil,
penalty_against = nil)
    @version = 1
    @goals = goals
    set_goals_for()
    @goals_against = goals_against.to_i
    unless penalty_for.nil?
      @penalty_for = penalty_for.to_i
      @penalty_against = penalty_against.to_i
    end
  end

  private
  def set_goals_for
    @goals_for = 0
    @goals.each_value {|value|  @goals_for += value.to_i }
  end
end


On Apr 17, 4:00 pm, "Craig Demyanovich"
<cdemyanov...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> Would you share your model definitions and the code that you use to
> create/save the statistic and goals instances?
>
> Craig
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I tried something a bit simpler just to see if it would work. Here''s
what I
did.

* create a new rails app (rails blah)
* create the databases (rake db:create:all)
* generate a Statistic model with a value column of type text
(script/generate model statistic value:text)
* run migrations (rake db:migrate)
* create a non-ActiveRecord class named Goals with one attributed named
goals_against
* run the Rails console (script/console) and do the following:
>> Statistic.create! :value => Goals.new(3)
=> #<Statistic id: 2, value: #<Goals:0x1928960 @goals_against=3>,
created_at: "2008-04-17 13:22:10", updated_at: "2008-04-17
13:22:10">
>> stat = Statistic.find :first
=> #<Statistic id: 2, value: #<Goals:0x1911ddc @goals_against=3>,
created_at: "2008-04-17 13:22:10", updated_at: "2008-04-17
13:22:10">
>> stat.value.goals_against
=> 3

I didn''t have any problems along the way. Other than using simpler
models/classes, nothing jumps out at me as to what you might have done
that''s causing your problem.

Here''s the source code.

class Statistic < ActiveRecord::Base
  serialize :value
end

class Goals
  attr_accessor :goals_against

  def initialize(goals_against)
    @goals_against = goals_against
  end
end

Here''s the generated schema from db/schema.rb.

ActiveRecord::Schema.define(:version => 1) do

  create_table "statistics", :force => true do |t|
    t.text     "value"
    t.datetime "created_at"
    t.datetime "updated_at"
  end

end

Let me know how it goes and if there''s anything more I can do.

Regards,
Craig

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Many thanks for the help.

I have found some strange behavior:

I use understanding code to first insert a then read a Goals object
from the database
stat = Statistic.new
stat.event_id = 1
stat.statistic_definition_id = 1
stat.value = Goals.new({1 => 1, 2 => 2}, 1)
stat.save

@statistics = @event.statistics.find(:all, :include
=> :statistic_definition)
goals_a =  @statistics.first.value.goals_against

When I use above code the deserialization works as it should.

The next time, when I only get the Goals object out of the database
(and not insert it first), deserialization fails. It seems that I have
to insert and read the object in the same request otherwise
deserialization fails.

This sounds very weird and I have no idea what causes this.

Regards,
Stijn

On Apr 17, 7:35 pm, "Craig Demyanovich"
<cdemyanov...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> I tried something a bit simpler just to see if it would work.
Here''s what I
> did.
>
> * create a new rails app (rails blah)
> * create the databases (rake db:create:all)
> * generate a Statistic model with a value column of type text
> (script/generate model statistic value:text)
> * run migrations (rake db:migrate)
> * create a non-ActiveRecord class named Goals with one attributed named
> goals_against
> * run the Rails console (script/console) and do the following:
>
> >> Statistic.create! :value => Goals.new(3)
>
> => #<Statistic id: 2, value: #<Goals:0x1928960
@goals_against=3>,
> created_at: "2008-04-17 13:22:10", updated_at: "2008-04-17
13:22:10">>> stat = Statistic.find :first
>
> => #<Statistic id: 2, value: #<Goals:0x1911ddc
@goals_against=3>,
> created_at: "2008-04-17 13:22:10", updated_at: "2008-04-17
13:22:10">>> stat.value.goals_against
>
> => 3
>
> I didn''t have any problems along the way. Other than using simpler
> models/classes, nothing jumps out at me as to what you might have done
> that''s causing your problem.
>
> Here''s the source code.
>
> class Statistic < ActiveRecord::Base
>   serialize :value
> end
>
> class Goals
>   attr_accessor :goals_against
>
>   def initialize(goals_against)
>     @goals_against = goals_against
>   end
> end
>
> Here''s the generated schema from db/schema.rb.
>
> ActiveRecord::Schema.define(:version => 1) do
>
>   create_table "statistics", :force => true do |t|
>     t.text     "value"
>     t.datetime "created_at"
>     t.datetime "updated_at"
>   end
>
> end
>
> Let me know how it goes and if there''s anything more I can do.
>
> Regards,
> Craig
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I found out something more. When I do:
Goals.new({1 => 1, 2 => 2}, 1)
@statistics = @event.statistics.find(:all, :include
=> :statistic_definition)
goals_a =  @statistics.first.value.goals_against

it works.
@statistics = @event.statistics.find(:all, :include
=> :statistic_definition)
goals_a =  @statistics.first.value.goals_against

I get undefined method `goals_against'' for
#<YAML::Object:0x539a954>

Can it be that the deserializer doesn''t know the Goals object somehow
by default? I put the Goals class file in my Lib directory.

Regards,
Stijn




When I do

it also works. I thus just have to use the Goals class

On Apr 18, 1:30 pm, Tarscher
<tarsc...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> Many thanks for the help.
>
> I have found some strange behavior:
>
> I use understanding code to first insert a then read a Goals object
> from the database
> stat = Statistic.new
> stat.event_id = 1
> stat.statistic_definition_id = 1
> stat.value = Goals.new({1 => 1, 2 => 2}, 1)
> stat.save
>
> @statistics = @event.statistics.find(:all, :include
> => :statistic_definition)
> goals_a =
 -I0Ix8485ByAhm4WSr3RupOPMIqm0nMIOvv+FofpDrrg@public.gmane.org_against
>
> When I use above code the deserialization works as it should.
>
> The next time, when I only get the Goals object out of the database
> (and not insert it first), deserialization fails. It seems that I have
> to insert and read the object in the same request otherwise
> deserialization fails.
>
> This sounds very weird and I have no idea what causes this.
>
> Regards,
> Stijn
>
> On Apr 17, 7:35 pm, "Craig Demyanovich"
<cdemyanov...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> wrote:
>
> > I tried something a bit simpler just to see if it would work.
Here''s what I
> > did.
>
> > * create a new rails app (rails blah)
> > * create the databases (rake db:create:all)
> > * generate a Statistic model with a value column of type text
> > (script/generate model statistic value:text)
> > * run migrations (rake db:migrate)
> > * create a non-ActiveRecord class named Goals with one attributed
named
> > goals_against
> > * run the Rails console (script/console) and do the following:
>
> > >> Statistic.create! :value => Goals.new(3)
>
> > => #<Statistic id: 2, value: #<Goals:0x1928960
@goals_against=3>,
> > created_at: "2008-04-17 13:22:10", updated_at:
"2008-04-17 13:22:10">>> stat = Statistic.find :first
>
> > => #<Statistic id: 2, value: #<Goals:0x1911ddc
@goals_against=3>,
> > created_at: "2008-04-17 13:22:10", updated_at:
"2008-04-17 13:22:10">>> stat.value.goals_against
>
> > => 3
>
> > I didn''t have any problems along the way. Other than using
simpler
> > models/classes, nothing jumps out at me as to what you might have done
> > that''s causing your problem.
>
> > Here''s the source code.
>
> > class Statistic < ActiveRecord::Base
> >   serialize :value
> > end
>
> > class Goals
> >   attr_accessor :goals_against
>
> >   def initialize(goals_against)
> >     @goals_against = goals_against
> >   end
> > end
>
> > Here''s the generated schema from db/schema.rb.
>
> > ActiveRecord::Schema.define(:version => 1) do
>
> >   create_table "statistics", :force => true do |t|
> >     t.text     "value"
> >     t.datetime "created_at"
> >     t.datetime "updated_at"
> >   end
>
> > end
>
> > Let me know how it goes and if there''s anything more I can
do.
>
> > Regards,
> > Craig
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In the example that I created, I put the Goals class in app/models even
though it''s not an ActiveRecord model. Does putting your Goals class in
app/models make a difference?

Regards,
Craig

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Hi Craig,

Putting it in the apps/model solves the problem. I though tough you
should put all your classes in the lib dir.

regards,
Stijn

On Apr 19, 3:00 pm, "Craig Demyanovich"
<cdemyanov...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> In the example that I created, I put the Goals class in app/models even
> though it''s not an ActiveRecord model. Does putting your Goals
class in
> app/models make a difference?
>
> Regards,
> Craig
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I''ve used the lib dir only once for a very simple rake task, but my
impression is that code in the lib dir should be available to the rest of
the app. If I have a chance to do a little learning, I''ll report back.

Craig

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