Rails - Aug 2005 - Column max length

Shouldn''t the text_field("user", "name")  helper
tag, generate the text max
size based on the database max length? Otherwise, if the user  types in more
text then is possible to be saved in the database an error will be thrown.

 

 

Thanks,

Alessandro

 

 



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"Alessandro Cauduro"
<equipe-/kv94B6L94ZwFqzsTH5u/w@public.gmane.org> writes:
> Shouldn''t the text_field("user", "name") 
helper tag, generate the text max
> size based on the database max length? Otherwise, if the user  types in
more
> text then is possible to be saved in the database an error will be thrown.
This level of reflection isn''t supported afaik.  The way I handle this
is by essentially repeating myself.  I specify column lengths in the
db scheme and then i repeat those lengths as validations in the
model.  Of course, that still won''t tell the text_field helper what
size to make the input.  So you really have to specify this length
three times:

create table ''foo'' {
  id int(11),
  fielda varchar(40)
}

validates_length_of :fielda, :within => 1..40

<%= text_field("foo", "fielda", :size => 40) %>

My understanding is that the database adapters need to be modified to
determine the column width and then set an accessor for something like
fielda_size or something.  Then both the validators and html helpers
could use that.
-- 
doug-jGAhs73c5XxeoWH0uzbU5w@public.gmane.org

> This level of reflection isn''t supported afaik.  
Try something like this:

Foo.columns_hash[''fielda''].limit.  

-- 
rick
http://techno-weenie.net