"validates_presence_of" not working

rubyonrails-talk
1

Hi, guys,

I'm learning to use Rails, and, while reading the "Rails: Up And Running" book, I tried to make an insertion validation, using the following code:

class Photo < ActiveRecord::Base   validates_presence_of :filename end

It simply didn't work, the validation does nothing and an insertion with an empty field returns TRUE.

What's wrong?

2

Hi, guys,

I'm learning to use Rails, and, while reading the "Rails: Up And Running" book, I tried to make an insertion validation, using the following code:

class Photo < ActiveRecord::Base   validates_presence_of :filename end

It simply didn't work, the validation does nothing and an insertion with an empty field returns TRUE.

What's wrong?

Hi,

Uh, well, it works for me. You'll need to provide more information for anyone to be able to help you I think. In particular, exactly what's returning "TRUE", and what you have in your record at the time.

Regards. George.

$ cat db/migrate/001_create_initial_tables.rb class CreateInitialTables < ActiveRecord::Migration   def self.up     create_table :photos do |t|       t.column :filename, :string     end   end

  def self.down     drop_table :photos   end end

$ cat app/models/photo.rb class Photo < ActiveRecord::Base   validates_presence_of :filename end

$ script/console Loading development environment.

Photo.new.valid?

=> false

Photo.new(:filename => '').valid?

=> false

Photo.new(:filename => 'blah').valid?

=> true

3

Oops, sorry George, indeed I should have put some more information about what's happening and what's the scene here...

There's a table in the db called "photos", with two columns, "id" and "filename". "filename" is set for "NULL" as default, but I want to use "validates_presence_of" as a mean to verify the field entry on the console ("script/console").

When I do a "photo=Photo.new", and a "photo.save", in the console, it should return "false", and generate the error strings for future analisys, but it's returning "true" and it creates a new record in my db with the "filename" field empty.

This was not supposed to happen because of "validate_presence_of :filename", which I wrote in the "photo.rb" model file.

Do I need to put more information? Thanks a lot, George!

Diogo

4

Hi, George,

Can't understand. Yesterday it was returning "true" in the console, with empty field, and today, after I answered your message for the first time, I tested it again, and it's returning "false"!!!

I tried to restart the server, and nothing, and, just now that I restarted my computer, it's working! What's happening? Any clue?

Thanks, George, again!

5

Hi, where’s the code where you’re trying to save the instance to the database? This should be somewhere in your controller code. Also, can you provide your script/console transcript similar to what George provided?

Thanks,

-Conrad