Rails - Apr 2008 - set a default value to a "text/blob" field at creation?

Is it possible somehow to incorporate "this is a text" into a
"blob/text"-value in the database when the row is created?
It''s not possible to do with a default value hence it''s a
"blob/text"-value.


At the moment I create the row for a user with:

  @presentation = current_user.presentation
  @presentation = current_user.create_presentation unless @presentation
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I tried to create this in my lib file string.rb to show something else 
if the value was nil...(and required the ''string.rb'' in my
application
helper)

  def or_empty(alternate)
    (self.nil? or self == "") ? alternate : self
  end

but that didn''t work either.
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You''d need to open the class up to do this.

class String
def or_empty(alternate = ''default'')
self.blank? ? alternate : self
end

That would work.

Julian.

Learn Ruby on Rails! CHECK OUT THE FREE VIDS (LIMITED TIME) VIDEO #3  
OUT APRIL 6
http://sensei.zenunit.com/


On 03/04/2008, at 11:40 PM, Dag Stensson wrote:
>
> I tried to create this in my lib file string.rb to show something else
> if the value was nil...(and required the ''string.rb'' in
my application
> helper)
>
>  def or_empty(alternate)
>    (self.nil? or self == "") ? alternate : self
>  end
>
> but that didn''t work either.
> -- 
> Posted via http://www.ruby-forum.com/.
>
> >


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Julian Leviston wrote:
> You''d need to open the class up to do this.
> 
> class String
> def or_empty(alternate = ''default'')
> self.blank? ? alternate : self
> end
> 
> That would work.
> 
> Julian.
> 
> Learn Ruby on Rails! CHECK OUT THE FREE VIDS (LIMITED TIME) VIDEO #3
> OUT APRIL 6
> http://sensei.zenunit.com/
Nope, that doesn''t do it,

I still get an error
"The error occurred while evaluating nil.or_empty"

in this line of my show-view:
<%= h @presentation.pres.or_empty("No presentation has been
entered")%>

because the there exists nothing in the pres-field. This is what I''m 
trying to fix.

what do you mean with:
> You''d need to open the class up to do this.
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On 4 Apr 2008, at 10:08, Dag Stensson wrote:
>
> Nope, that doesn''t do it,
>
> I still get an error
> "The error occurred while evaluating nil.or_empty"
>
> in this line of my show-view:
> <%= h @presentation.pres.or_empty("No presentation has been
entered")
> %>
>
> because the there exists nothing in the pres-field. This is what
I''m
> trying to fix.
How about you do this in your model

def pres
   value_in_database = self[:pres]
   #do something with value_in_database
end

Fred



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Frederick Cheung wrote:
> On 4 Apr 2008, at 10:08, Dag Stensson wrote:
>> because the there exists nothing in the pres-field. This is what
I''m
>> trying to fix.
> 
> How about you do this in your model
> 
> def pres
>    value_in_database = self[:pres]
>    #do something with value_in_database
> end
> 
> Fred
I''m not quite sure I completely understand... =/
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On 4 Apr 2008, at 10:47, Dag Stensson wrote:
>
> Frederick Cheung wrote:
>> On 4 Apr 2008, at 10:08, Dag Stensson wrote:
>>> because the there exists nothing in the pres-field. This is what
I''m
>>> trying to fix.
>>
>> How about you do this in your model
>>
>> def pres
>>   value_in_database = self[:pres]
>>   #do something with value_in_database
>> end
>>
>> Fred
>
> I''m not quite sure I completely understand... =/
Overwrite the accessor that rails provides, using self[:pres] to get  
at the original value.

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

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Frederick Cheung wrote:
> On 4 Apr 2008, at 10:47, Dag Stensson wrote:
> 
>>>   #do something with value_in_database
>>> end
>>>
>>> Fred
>>
>> I''m not quite sure I completely understand... =/
> 
> Overwrite the accessor that rails provides, using self[:pres] to get
> at the original value.
> 
> Fred
Alright, thanx a lot, solved the problem!
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