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Scott Kulik

2008-May-22 00:51 UTC

how to set a data value before saving or destroying

here is my code

class Manufacture < ActiveRecord::Base
    belongs_to :item
    before_save :set_has_manufacture_yes
    before_destroy :set_has_manufacture_no

    def set_has_manufacture_yes
      self.item.has_manufacture = "Yes"
    end

    def set_has_manufacture_no
      self.item.has_manufacture = "No"
    end

For some reason the value is not getting set.  Is this because I am
trying to set a value in the ITEMS table and not MANUFACTURES?
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Ryan Bigg (Radar)

2008-May-22 00:52 UTC

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Re: how to set a data value before saving or destroying

What is this has_manufacture field and why is it so important?

On Thu, May 22, 2008 at 10:21 AM, Scott Kulik <
rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote:
>
> here is my code
>
> class Manufacture < ActiveRecord::Base
>    belongs_to :item
>    before_save :set_has_manufacture_yes
>    before_destroy :set_has_manufacture_no
>
>    def set_has_manufacture_yes
>      self.item.has_manufacture = "Yes"
>    end
>
>    def set_has_manufacture_no
>      self.item.has_manufacture = "No"
>    end
>
> For some reason the value is not getting set.  Is this because I am
> trying to set a value in the ITEMS table and not MANUFACTURES?
> --
> Posted via http://www.ruby-forum.com/.
>
> >
>

-- 
Appreciated my help?
Recommend me on Working With Rails
http://workingwithrails.com/person/11030-ryan-bigg

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Scott Kulik

2008-May-22 01:10 UTC

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Re: how to set a data value before saving or destroying

Ryan Bigg wrote:> What is this has_manufacture field and why is it so important?
> 
> On Thu, May 22, 2008 at 10:21 AM, Scott Kulik <
> rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote:
> 
>>    end
>> >
>>
> 
> 
> --
> Appreciated my help?
> Recommend me on Working With Rails
> http://workingwithrails.com/person/11030-ryan-bigg
basically when someone create a manufacture i have a drop down list of 
all the items that don''t already have a manufacture.  so what
i''m trying
to do is an easy way to populate the drop down list with all the items 
that don''t have a manufacture yet.

here a few fields from my data structures

ITEMS
id
name
has_manufacture
...

MANUFACTURES
id
item_id
...

so my collection select currently selects all items where 
has_manufacture = "No"

i''m not sure if there is another way i could do something like select 
NOT items.manufacture.blank?

i''m sure there is probably an easier way to do it but i''m not
sure of
the logic.
-- 
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Scott Kulik

2008-May-22 01:11 UTC

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Re: how to set a data value before saving or destroying

oops i forgot to mention my models

ITEMS
has_one :manufacture

MANUFACTURES
belongs_to :item
-- 
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Ryan Bigg (Radar)

2008-May-22 01:16 UTC

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Re: how to set a data value before saving or destroying

is has_manufacture a boolean field?

On Thu, May 22, 2008 at 10:41 AM, Scott Kulik <
rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote:
>
> oops i forgot to mention my models
>
> ITEMS
> has_one :manufacture
>
> MANUFACTURES
> belongs_to :item
> --
> Posted via http://www.ruby-forum.com/.
>
> >
>

-- 
Appreciated my help?
Recommend me on Working With Rails
http://workingwithrails.com/person/11030-ryan-bigg

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Scott Kulik

2008-May-22 02:34 UTC

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Re: how to set a data value before saving or destroying

i could change it.  right now it''s "Yes" or "No" 
it''s probably better
coding to use the boolean maybe?  it''s easier to display though with
Yes
or No.  but i could easily just through in a helper function.

Ryan Bigg wrote:> is has_manufacture a boolean field?
> 
> On Thu, May 22, 2008 at 10:41 AM, Scott Kulik <
> rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote:
> 
>>
>> >
>>
> 
> 
> --
> Appreciated my help?
> Recommend me on Working With Rails
> http://workingwithrails.com/person/11030-ryan-bigg
-- 
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Rob Biedenharn

2008-May-22 02:35 UTC

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Re: how to set a data value before saving or destroying

On May 21, 2008, at 9:10 PM, Scott Kulik wrote:> Ryan Bigg wrote:
>> What is this has_manufacture field and why is it so important?
>>
>> On May 21, 2008, at 8:51 PM, Scott Kulik wrote:
>>> here is my code
>>>
>>> class Manufacture < ActiveRecord::Base
>>>    belongs_to :item
>>>    before_save :set_has_manufacture_yes
>>>    before_destroy :set_has_manufacture_no
>>>
>>>    def set_has_manufacture_yes
>>>      self.item.has_manufacture = "Yes"
>>>    end
>>>
>>>    def set_has_manufacture_no
>>>      self.item.has_manufacture = "No"
>>>    end
>>>
>>> For some reason the value is not getting set.  Is this because I am
>>> trying to set a value in the ITEMS table and not MANUFACTURES?
>>
> basically when someone create a manufacture i have a drop down list of
> all the items that don''t already have a manufacture.  so what
i''m
> trying
> to do is an easy way to populate the drop down list with all the items
> that don''t have a manufacture yet.
>
> here a few fields from my data structures
>
> ITEMS
> id
> name
> has_manufacture
> ...
>
> MANUFACTURES
> id
> item_id
> ...
>
> so my collection select currently selects all items where
> has_manufacture = "No"
>
> i''m not sure if there is another way i could do something like
select
> NOT items.manufacture.blank?
>
> i''m sure there is probably an easier way to do it but i''m
not sure of
> the logic.
While I think you might mean to say "manufacturer", I think this
works:

class Item < ActiveRecord::Base
   has_one :manufacture

   def self.find_all_with_no_manufacture
     find(:all, :select => "items.*",
          :joins => "LEFT OUTER JOIN manufactures ON  
manufactures.item_id = items.id",
          :conditions => ''manufactures.id IS NULL'')
   end
end

You might need a :readonly=>false  in there, too, if you use this for  
more than the drop-down.
You could instead have  :select => "items.id, items.name"  if you
just
intend to create [name,id] pairs for the select list by adding  .map{| 
i| [i.name,i.id]}
(But I would name the method items_with_no_manufacture_for_select in  
that case so it''s clear that you aren''t getting full model
objects
back.)

-Rob

Rob Biedenharn		http://agileconsultingllc.com
Rob-xa9cJyRlE0mWcWVYNo9pwxS2lgjeYSpx@public.gmane.org
+1 513-295-4739
Skype:	rob.biedenharn



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Scott Kulik

2008-May-22 02:52 UTC

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Re: how to set a data value before saving or destroying

Rob Biedenharn wrote:> On May 21, 2008, at 9:10 PM, Scott Kulik wrote:
>>>>
>>>
>> name
>>
>> i''m not sure if there is another way i could do something like
select
>> NOT items.manufacture.blank?
>>
>> i''m sure there is probably an easier way to do it but
i''m not sure of
>> the logic.
> 
> While I think you might mean to say "manufacturer", I think this
works:
> 
> class Item < ActiveRecord::Base
>    has_one :manufacture
> 
>    def self.find_all_with_no_manufacture
>      find(:all, :select => "items.*",
>           :joins => "LEFT OUTER JOIN manufactures ON
> manufactures.item_id = items.id",
>           :conditions => ''manufactures.id IS NULL'')
>    end
> end
thanks Rob!! that worked perfectly.  now i can remove the
has_manufacture field!!

thanks for your suggestions too ryan.
-- 
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AndyV

2008-May-22 06:19 UTC

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Re: how to set a data value before saving or destroying

To answer your original question... you were setting the value of the
attribute, but you never called save.

It''s a moot point now, but either of these should have worked:

    def set_has_manufacture_yes
      self.item.has_manufacture = "Yes"
      self.item.save
    end

    def set_has_manufacture_yes
      self.item.update_attribute(:has_manufacture, "Yes")
    end

    def set_has_manufacture_yes
      self.item.update_attributes(:has_manufacture=>"Yes")
    end


On May 21, 10:52 pm, Scott Kulik
<rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:> Rob Biedenharn wrote:
> > On May 21, 2008, at 9:10 PM, Scott Kulik wrote:
>
> >> name
>
> >> i''m not sure if there is another way i could do something
like select
> >> NOT items.manufacture.blank?
>
> >> i''m sure there is probably an easier way to do it but
i''m not sure of
> >> the logic.
>
> > While I think you might mean to say "manufacturer", I think
this works:
>
> > class Item < ActiveRecord::Base
> >    has_one :manufacture
>
> >    def self.find_all_with_no_manufacture
> >      find(:all, :select => "items.*",
> >           :joins => "LEFT OUTER JOIN manufactures ON
> > manufactures.item_id = items.id",
> >           :conditions => ''manufactures.id IS
NULL'')
> >    end
> > end
>
> thanks Rob!! that worked perfectly.  now i can remove the
> has_manufacture field!!
>
> thanks for your suggestions too ryan.
> --
> Posted viahttp://www.ruby-forum.com/.--~--~---------~--~----~------------~-------~--~----~
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Scott Kulik

2008-May-22 06:31 UTC

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Re: how to set a data value before saving or destroying

ah ok thanks i thought the create method that was calling the save 
should work.  thanks!
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Rails - May 2008 - how to set a data value before saving or destroying

how to set a data value before saving or destroying

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