Valle automatically creates validations for the minimum and maximum values of fields in your ActiveRecord model(s). No more worrying that string lengths or ID values will exceed the permissible DB limits!
For example, the maximum length of the string
type in PostgreSQL is 255. Valle creates the following validator for you, so you no longer need to write it by hand:
validates :field_name, length: { maximum: 255 }
Note: If you do not do this (and usually you are) and try to enter 2147483648 into a field of type integer
(see the Numeric types section of PostgreSQL docs), you will get a 500 error.
Example:
PG::Error: ERROR: value "2147483648" is out of range for type integer
: SELECT "users".* FROM "users" WHERE "users"."id" = $1 LIMIT 1
- 3.x
- 4.x
:primary_key
:integer
:string
:text
Add this line to your application's Gemfile:
gem 'valle'
And then execute:
$ bundle
Or install it yourself:
$ gem install valle
By default, this gem adds validators to all your ActiveRecord models. If that is the behavior you want, you don't need to tweak it.
However, you can specify what models to take into account by adding the file config/initializers/valle.rb
containing:
Valle.configure do |config|
config.models = %w(User, Post)
end
Also, you can disable it temporarily by setting the enabled
configuration option to false
.
Valle.configure do |config|
config.enabled = false
end
There are cases where you need to skip validation for a particular attribute (see #4). For example, CarrierWave stores images temporarily in attributes, so calling save
on them will fail because of its LengthValidator (255 characters maximum). You can disable Valle for such fields using the attributes
configuration option:
Valle.configure do |config|
config.attributes = {
'User' => %w(id name) # Model => Array of attributes to validate
}
end
There is a similar gem, called validates_lengths_from_database. It solves only one part of the problem โ applicable to strings. Valle, however, is designed to work with all possible field types.
- Fork it
- Create your feature branch (
git checkout -b my-new-feature
) - Commit your changes (
git commit -am 'Added some feature'
) - Run test suite (
rake test_suite
) - Push to the branch (
git push origin my-new-feature
) - Create new Pull Request
Team members:
Thank you to all our amazing contributors!
Valle is released under the MIT License.