Field validation

Rails
1

Hi
I have a field called “cost”:

<%= f.text_field :cost, :size=>2, :maxlength=>4 %>

I want to check that user enter numeral value and this value is integer

In post.rb (model):

def cost_validate_int
  errors.add_to_base("Error message") unless cost.is_a?(Fixnum)
  puts "### #{cost}: "+cost.class.to_s
end

When I enter in field 100 I get:

100: Fixnum

when I enter 10.1:

10: Fixnum

when I enter ‘asdf’:

0: Fixnum

I completely can’t understand what happen. In migration:

t.integer :cost

I think ActiveRectord converts value to Fixnum because in migration this
field signed as integer

Can I in some way check cost value in model (value should be numeral and
integer)?

Thanks in advance!

2

Stanislav O. wrote:

Can I in some way check cost value in model (value should be numeral and
integer)?

Thanks in advance!

validates_numericality_of?

3

Pale H. wrote:

Stanislav O. wrote:

Can I in some way check cost value in model (value should be numeral and
integer)?

Thanks in advance!

validates_numericality_of?

I use errors.add_to_base because I don’t want to show field’s name in
the error message(i. e. Cost bla bla bla. web site is localized).

4

On 16 June 2010 11:34, Stanislav O. [email protected] wrote:

 errors.add_to_base("Error message") unless cost.is_a?(Fixnum)

when I enter ‘asdf’:

0: Fixnum

I completely can’t understand what happen. In migration:

t.integer :cost

I think ActiveRectord converts value to Fixnum because in migration this
field signed as integer

How is the string you enter getting into the cost attribute?

Colin

5

well… in fact… you did defined it as an “integer” so, dont expect to
get
any other class thats not Fixnum or Bignum…

but, you can also use some model validations to be sure that the user
entered an integer…

try validates_numericality_of :cost
it will stop your user from entering strings…

im not sure how to stop it from entering floats like "10.6", but im
sure
there’s a simple way of doing it…

you know, you’re programming in ruby on rails, it IS simple.
Sempre Alerta Para Servir,

Lucas Franceschi
Equipe de Programação (Automação)
SGI Sistemas
(049) 9922-3360

6

Colin L. wrote:

On 16 June 2010 11:34, Stanislav O. [email protected] wrote:

� � �errors.add_to_base(“Error message”) unless cost.is_a?(Fixnum)

when I enter ‘asdf’:

0: Fixnum

I completely can’t understand what happen. In migration:

t.integer :cost

I think ActiveRectord converts value to Fixnum because in migration this
field signed as integer

How is the string you enter getting into the cost attribute?

Colin

I can’t understand why cost field value (10, 10.1 or ‘asdf’) all time is
Fixnum in model. In this model I try to validate cost, and can’t because
all time I get only one type - Fixnum!

7

try looking
Herehttp://api.rubyonrails.org/classes/ActiveRecord/Validations/ClassMethods.html#M001401
.
Sempre Alerta Para Servir,

Lucas Franceschi
Equipe de Programação (Automação)
SGI Sistemas
(049) 9922-3360