Problem with validates_length_of

rubyonrails-talk
1

I’m passing a field called :year, to the game model for a new game. It has the validation

validates_length_of :year, :is => 4, :if => :check_year?

The if works (a similar validates_numericality_of :year) is being checked, so something before it is not working right. Why?

10 ← passed but shouldn’t 100 ← passes but shoulnd’t 1000 ← passes and it should 10000 ← passes but shouldn’t

Has anyone got any ideas why this might be happening, or how to fix?

Using Rails 2.1.0.

Thanks for your help.

2

Its passed from a text field on a form, so technically it would be a string, but I guess it converts it on save because when I tried to concat with another string, it wouldn’t change types.

And I’d really rather not change it to a string and back to int just for one validation (and even if I did, I’m not sure how at this point (before_save ?)

Any other ideas?

Regards Kieran

3

this should work?

validates_length_of :year.to_s, :is => 4

Or use validates_format_of with a regex that looks for 4 numerals. \d{4}

– gw

4

Sorry Greg. Neither of those (:year.to_s or format_of) appear to work for some unknown reason.

Its very weird :frowning:

Regards Kieran

5

Kieran P wrote:

I'm passing a field called :year, to the game model for a new game. It has the validation

validates_length_of :year, :is => 4, :if => :check_year?

The if works (a similar validates_numericality_of :year) is being checked, so something before it is not working right. Why?

10 <- passed but shouldn't 100 <- passes but shoulnd't 1000 <- passes and it should 10000 <- passes but shouldn't

Has anyone got any ideas why this might be happening, or how to fix?

Using Rails 2.1.0. <http://2.1.0.>

validates_numericality_of :year, :greater_than => 999, :less_than => 10000

Lionel

6

Sorry Greg. Neither of those (:year.to_s or format_of) appear to
work for some unknown reason.

Lionel gave the answer, but it's worth pointing out that
the :year.to_s thing couldn't possibly work, since it's just the same
as typing

validates_length_of 'year', :is => 4 which we know doesn't work.

Fred

7

Thanks Lionel. That worked :smiley: Finally my tests are passing :smiley:

Is the fact that length wouldn’t work on integers a bug in rails?

Regards Kieran

8

Is the fact that length wouldn't work on integers a bug in rails?

no, numbers have no length as such (I wouldn't know of any programming language, library or whatever where they have) The actual length would at least depend on the used number system (decimal, hex...)