Rails 7 adds only_numeric option to numericality validator

Rails 7.0.1 introduces only_numeric option to numericality validator which specifies whether the value has to be an instance of Numeric. The default behavior is to attempt parsing the value if it is a String.

When the database field is a float column, the data will get serialized to the correct type. In the case of a JSON column, serialization doesn't take place.

As a resolution, Rails 7 has added only_numeric option to numericality validator.

We will see it in action.

To demonstrate, we need to generate a table that has a json/jsonb column.

# migration
create_table :users do |t|
  t.jsonb :personal
end

Before Validation

# Model
class User < ApplicationRecord
  store_accessor :personal, %i[age tooltips]
end

# rails console
>> User.create!(age: '29')
=> #<User id: 1, preferences: {"age"=>"29"}, created_at: Sun, 16 Jan 2022 14:09:43.045301000 UTC +00:00, updated_at: Sun, 16 Jan 2022 14:09:43.045301000 UTC +00:00>

After Validation

# Model
class User < ApplicationRecord
  store_accessor :personal, %i[age tooltips]
  validates_numericality_of :age, only_numeric: true, allow_nil: true
end

# rails console
>> User.create!(age: '29')
=> 'raise_validation_error': Validation failed: Age is not a number (ActiveRecord::RecordInvalid)

>> User.create!(age: 29)
=> #<User id: 2, preferences: {"age"=>29}, created_at: Sun, 16 Jan 2022 14:15:44.599934000 UTC +00:00, updated_at: Sun, 16 Jan 2022 14:15:44.599934000 UTC +00:00>

Please check out this pull request for more details.